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< / div > < div class = "- topic/body body" > < p class = "- topic/p p" data-ofbid = "d221262e24__20250121171647" > 在 < span class = "- topic/ph ph" > Luban-Lite< / span >
系统中，分区的设置和管理是系统正常运行和日常维护的重要方面。本章节介绍 < span class = "- topic/ph ph" > Luban-Lite< / span >
系统中分区的特点、规则和分区修改的方法。< / p > < div class = "- topic/p p" data-ofbid = "d221262e32__20250121171647" > 按照存储介质的逻辑划分，< span class = "- topic/ph ph" > Luban-Lite< / span >
默认分区包括以下几种：< ul class = "- topic/ul ul" id = "id__ul_xbf_12y_5cc" data-ofbid = "id__ul_xbf_12y_5cc" > < li class = "- topic/li li" data-ofbid = "d221262e38__20250121171647" > < a class = "- topic/xref xref" href = "partition.html#id__section_k1p_zlq_gdc" > 启动分区< / a > ：存放 BootLoader， < / li > < li class = "- topic/li li" data-ofbid = "d221262e43__20250121171647" > < a class = "- topic/xref xref" href = "partition.html#id__section_cpt_fmq_gdc" > 数据分区< / a > ：用于存储用户数据。< / li > < li class = "- topic/li li" data-ofbid = "d221262e48__20250121171647" > < a class = "- topic/xref xref" href = "partition.html#id__section_n5m_gmq_gdc" > 系统 A/B 分区< / a > ：分为 A/B 系统，实现 OTA，
上保存前后两个版本的系统程序。< / li > < / ul > < / div > < section class = "- topic/section section" id = "id__section_k1p_zlq_gdc" data-ofbid = "id__section_k1p_zlq_gdc" > < h2 class = "- topic/title title sectiontitle" > 启动分区< / h2 >
< p class = "- topic/p p" data-ofbid = "d221262e58__20250121171647" > 在 < span class = "- topic/ph ph" > Luban-Lite< / span > 系统中，启动分区（"spl" 分区）是存储介质上的第一个分区，用于存放
BootLoader， ， < / p >
< p class = "- topic/p p" data-ofbid = "d221262e64__20250121171647" > "spl" 分区为默认名称，用户可以根据需要自定义和修改启动分区名称。< / p >
< p class = "- topic/p p" data-ofbid = "d221262e67__20250121171647" > < span class = "- topic/ph ph" > Luban-Lite< / span > 系统中的默认分区设置如下：< / p >
< ul class = "- topic/ul ul" id = "id__ul_l1p_zlq_gdc" data-ofbid = "id__ul_l1p_zlq_gdc" > < li class = "- topic/li li" data-ofbid = "d221262e73__20250121171647" >
< p class = "- topic/p p" data-ofbid = "d221262e75__20250121171647" > SPINOR< / p >
< p class = "- topic/p p" data-ofbid = "d221262e78__20250121171647" > SPINOR Flash 的 0 ~ X 区间被设置为启动分区，主要用于存放 BootLoader， < / p >
< p class = "- topic/p p" data-ofbid = "d221262e81__20250121171647" > 尽管 BROM 加载的程序可以大于 256K， < / p >
< / li > < li class = "- topic/li li" data-ofbid = "d221262e84__20250121171647" >
< p class = "- topic/p p" data-ofbid = "d221262e86__20250121171647" > SPINAND< / p >
< div class = "- topic/p p" data-ofbid = "d221262e89__20250121171647" > SPINAND Flash 的前四个物理块被用作启动块，启动分区内使用四个启动块保存两份启动镜像：< ul class = "- topic/ul ul" id = "id__ul_wgs_gfy_5cc" data-ofbid = "id__ul_wgs_gfy_5cc" > < li class = "- topic/li li" data-ofbid = "d221262e92__20250121171647" > 对于块大小为 128K 的 SPINAND， < / li > < li class = "- topic/li li" data-ofbid = "d221262e94__20250121171647" > 对于 块大小为 256K 的 SPINAND， < / li > < / ul > < / div >
< / li > < li class = "- topic/li li" data-ofbid = "d221262e97__20250121171647" >
< p class = "- topic/p p" data-ofbid = "d221262e99__20250121171647" > eMMC< / p >
< p class = "- topic/p p" data-ofbid = "d221262e102__20250121171647" > eMMC 的启动分区位于 UDA 区域的 17K ~ X 区间， < / p >
< p class = "- topic/p p" data-ofbid = "d221262e105__20250121171647" > 建议启动镜像小于 512K。< / p >
< / li > < / ul >
< / section > < section class = "- topic/section section" id = "id__section_cpt_fmq_gdc" data-ofbid = "id__section_cpt_fmq_gdc" > < h2 class = "- topic/title title sectiontitle" > 数据分区< / h2 >
< div class = "- topic/div div section" id = "id__id4" >
< p class = "- topic/p p" data-ofbid = "d221262e116__20250121171647" > 在 < span class = "- topic/ph ph" > Luban-Lite< / span > 系统中，通过对 SPINOR/ SPINAND Flash
进行分区可以实现数据的存储和管理，为数据的读写提供了不同的功能和性能特点。< / p >
< p class = "- topic/p p" data-ofbid = "d221262e122__20250121171647" > 在 < span class = "- topic/ph ph" > Luban-Lite< / span > 系统中，
上设置了以下默认分区来保存数据。两个分区在设计和实现上有一些差异，用户需要了解并根据实际情况规划数据存储：< / p >
< ul class = "- topic/ul ul" id = "id__ul_m1p_zlq_gdc" data-ofbid = "id__ul_m1p_zlq_gdc" > < li class = "- topic/li li" data-ofbid = "d221262e129__20250121171647" >
< p class = "- topic/p p" data-ofbid = "d221262e131__20250121171647" > "rodata"
< / p >
< p class = "- topic/p p" data-ofbid = "d221262e134__20250121171647" > 目的：保存 APP 应用需要使用的资源文件，这些文件通常是应用的一部分，都是只读的数据，只是为了更好的管理和访问，使用 FAT
文件系统的方式保存。< / p >
< p class = "- topic/p p" data-ofbid = "d221262e137__20250121171647" > 应用在访问这些资源文件的时候，通常要求能够快速读取数据，因此 "rodata"
分区在实现的时候，删减了多余的软件层次，通过直接访问 Flash 的方式读取数据，以达到更优的速度。这些优化，也使得
"rodata" 仅支持读取，不支持写入。< / p >
< div class = "- topic/note note note note_note" id = "id__note_pbj_gvw_fdc" data-ofbid = "id__note_pbj_gvw_fdc" > < span class = "note__title" > 注：< / span >
< div class = "- topic/p p" data-ofbid = "d221262e144__20250121171647" > 使用 SPINOR 时，可以通过配置的方式强制使能 "rodata" 可读写，但是需要注意其中的风险：< ol class = "- topic/ol ol arabic simple" id = "id__ol_irn_gvw_fdc" data-ofbid = "id__ol_irn_gvw_fdc" > < li class = "- topic/li li" data-ofbid = "d221262e147__20250121171647" >
< p class = "- topic/p p" data-ofbid = "d221262e149__20250121171647" > Flash 写入前需要先按块擦除，但是擦除和重新写入需要的时间比较长< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d221262e152__20250121171647" >
< p class = "- topic/p p" data-ofbid = "d221262e154__20250121171647" > FATFS 没有日志，不支持异地写入，因此需要原地回写，如果擦除和回写时出现掉电，会导致文件系统损坏< / p >
< / li > < / ol > < / div >
< / div >
< / li > < li class = "- topic/li li" data-ofbid = "d221262e160__20250121171647" >
< div class = "- topic/p p" data-ofbid = "d221262e162__20250121171647" > "data"< ul class = "- topic/ul ul" id = "id__ul_n5v_sgy_5cc" data-ofbid = "id__ul_n5v_sgy_5cc" > < li class = "- topic/li li" data-ofbid = "d221262e165__20250121171647" > 目的：提供一个可读写的文件系统分区，用于保存设备在使用过程中生成的需要写入 Flash 的数据。< / li > < li class = "- topic/li li" data-ofbid = "d221262e167__20250121171647" > 文件系统：< ul class = "- topic/ul ul" id = "id__ul_wvg_zgy_5cc" data-ofbid = "id__ul_wvg_zgy_5cc" > < li class = "- topic/li li" data-ofbid = "d221262e170__20250121171647" > 在 SPINOR Flash 上，使用 LittleFS。< / li > < li class = "- topic/li li" data-ofbid = "d221262e172__20250121171647" > 在 SPINAND Flash 上，使用 FATFS。< / li > < li class = "- topic/li li" data-ofbid = "d221262e174__20250121171647" > 在 eMMC 上，每个分区都是可读写的，默认使用 FATFS。< / li > < / ul > < / li > < li class = "- topic/li li" data-ofbid = "d221262e176__20250121171647" > 读写支持：可读写，适合存储设备运行过程中产生的临时数据或需要修改的数据。< / li > < li class = "- topic/li li" data-ofbid = "d221262e178__20250121171647" > 适用场景：需要频繁读写的场景，如用户设置、日志记录等。< / li > < / ul > < / div >
< / li > < / ul >
< / div >
< / section > < section class = "- topic/section section" id = "id__section_n5m_gmq_gdc" data-ofbid = "id__section_n5m_gmq_gdc" > < h2 class = "- topic/title title sectiontitle" > 系统 A/B 分区< / h2 >
< div class = "- topic/div div section" id = "id__a-b" >
< p class = "- topic/p p" data-ofbid = "d221262e190__20250121171647" > 在 < span class = "- topic/ph ph" > Luban-Lite< / span > 系统中，
软件更新机制的一个重要部分。这种分区方式需要在 Flash 上保存前后两个版本的系统程序，并将每个版本保存在指定的分区中。 < / p >
< p class = "- topic/p p" data-ofbid = "d221262e196__20250121171647" > A/B 系统的分区命名比较直接，便于轻松识别两套软件版本，详细命名规则如下所示：< / p >
< ul class = "- topic/ul ul simple" id = "id__ul_cmq_hvw_fdc" data-ofbid = "id__ul_cmq_hvw_fdc" > < li class = "- topic/li li" data-ofbid = "d221262e200__20250121171647" >
< p class = "- topic/p p" data-ofbid = "d221262e202__20250121171647" > A 系统分区：直接使用其所代表的分区的名称，例如存储只读数据的 "rodata" 分区，则 A 系统分区即命名为
"rodata"。< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d221262e205__20250121171647" >
< p class = "- topic/p p" data-ofbid = "d221262e207__20250121171647" > B 系统分区：在对应的 A 系统分区名后加上 < span class = "+ topic/ph sw-d/filepath ph filepath" > _r< / span > 后缀，例如
< span class = "+ topic/ph sw-d/filepath ph filepath" > rodata_r< / span > 。< / p >
< / li > < / ul >
< p class = "- topic/p p" data-ofbid = "d221262e217__20250121171647" > 使用专门的 A/B 分区机制，可以最大化资源使用、实现备份，并且提前配置所需软件更新的存储空间，而不影响系统的运行性能。< / p >
< / div >
< / section > < section class = "- topic/section section" id = "id__id5" data-ofbid = "id__id5" > < h2 class = "- topic/title title sectiontitle" > 分区与存储设备关系< / h2 >
< p class = "- topic/p p" data-ofbid = "d221262e226__20250121171647" > < span class = "- topic/ph ph" > Luban-Lite< / span > 上使用 RT-Thread
时，每个分区都对应一个或者多个系统设备。不同存储介质的对应关系如下表格所示。系统中出现但此处未列出的其他分区，同样遵循下列规则。< / p >
< div class = "table-container" > < table class = "- topic/table table longtable colwidths-given docutils align-default frame-all" id = "id__id10" data-ofbid = "id__id10" data-cols = "5" > < caption class = "- topic/title title tablecap" data-caption-side = "top" data-is-repeated = "true" > < span class = "table--title-label" > 表< span class = "table--title-label-number" > 1< / span > < span class = "table--title-label-punctuation" > . < / span > < / span > < span class = "table--title" > SPINOR 上的分区、设备和文件系统< / span > < / caption > < colgroup > < col style = "width:16.707920792079207%" / > < col style = "width:16.707920792079207%" / > < col style = "width:16.707920792079207%" / > < col style = "width:12.376237623762377%" / > < col style = "width:37.5%" / > < / colgroup > < thead class = "- topic/thead thead" > < tr class = "- topic/row" > < th class = "- topic/entry entry colsep-1 rowsep-1" id = "id__id10__entry__1" > 分区名< / th > < th class = "- topic/entry entry colsep-1 rowsep-1" id = "id__id10__entry__2" > MTD 设备名< / th > < th class = "- topic/entry entry colsep-1 rowsep-1" id = "id__id10__entry__3" > 块设备名< / th > < th class = "- topic/entry entry colsep-1 rowsep-1" id = "id__id10__entry__4" > 文件系统< / th > < th class = "- topic/entry entry colsep-0 rowsep-1" id = "id__id10__entry__5" > 备注< / th > < / tr > < / thead > < tbody class = "- topic/tbody tbody" > < tr class = "- topic/row" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id10__entry__1" > "spl"
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id10__entry__2" > "spl"
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id10__entry__3" > -< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id10__entry__4" > -< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__id10__entry__5" > -< / td > < / tr > < tr class = "- topic/row" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id10__entry__1" > "os"
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id10__entry__2" > "os"
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id10__entry__3" > -< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id10__entry__4" > -< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__id10__entry__5" > -< / td > < / tr > < tr class = "- topic/row" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id10__entry__1" > "rodata"
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id10__entry__2" > "rodata"
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id10__entry__3" > "blk_rodata"
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id10__entry__4" > FATFS< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__id10__entry__5" > FATFS 通过 "blk_rodata" 设备访问 Flash< / td > < / tr > < tr class = "- topic/row" > < td class = "- topic/entry entry colsep-1 rowsep-0" headers = "id__id10__entry__1" > "data"
< / td > < td class = "- topic/entry entry colsep-1 rowsep-0" headers = "id__id10__entry__2" > "data"
< / td > < td class = "- topic/entry entry colsep-1 rowsep-0" headers = "id__id10__entry__3" > -< / td > < td class = "- topic/entry entry colsep-1 rowsep-0" headers = "id__id10__entry__4" > LittleFS< / td > < td class = "- topic/entry entry colsep-0 rowsep-0" headers = "id__id10__entry__5" > LittleFS 直接通过 MTD 设备访问 Flash< / td > < / tr > < / tbody > < / table > < / div >
< ul class = "- topic/ul ul" id = "id__ul_xbz_pjy_5cc" data-ofbid = "id__ul_xbz_pjy_5cc" > < li class = "- topic/li li" data-ofbid = "d221262e299__20250121171647" > 分区名：< ul class = "- topic/ul ul" id = "id__ul_ocj_zjy_5cc" data-ofbid = "id__ul_ocj_zjy_5cc" > < li class = "- topic/li li" data-ofbid = "d221262e302__20250121171647" > "spl"：分区及其设备名，"spl"
分区主要用于存储二次引导加载程序，是系统启动的第一个阶段所加载的程序。< / li > < li class = "- topic/li li" data-ofbid = "d221262e304__20250121171647" > "os"： < / li > < li class = "- topic/li li" data-ofbid = "d221262e306__20250121171647" > "rodata"：
分区，主要用于存储只读数据，包括系统在运行时需要读取但不修改的配置信息等。< / li > < li class = "- topic/li li" data-ofbid = "d221262e308__20250121171647" > "data"：
分区，用来存储可变数据，如用户生成的数据或系统运行时产生的临时数据。< / li > < / ul > < / li > < li class = "- topic/li li" data-ofbid = "d221262e310__20250121171647" > MTD 设备名：对 Flash 的底层直接访问，便于进行读写硬件等操作。< / li > < li class = "- topic/li li" data-ofbid = "d221262e312__20250121171647" > 块设备名：通过将物理存储抽象为块设备，简化了对文件系统的操作。仅 "rodata" 分区关联了一个块设备名
"blk_rodata"。< / li > < li class = "- topic/li li" data-ofbid = "d221262e314__20250121171647" > 文件系统："rodata" 分区使用 FATFS
文件系统，使得数据以文件的形式进行存储和管理。"data" 分区使用 LittleFS 文件系统。< / li > < li class = "- topic/li li" data-ofbid = "d221262e316__20250121171647" > 访问规则：< ul class = "- topic/ul ul" id = "id__ul_bst_25n_hdc" data-ofbid = "id__ul_bst_25n_hdc" > < li class = "- topic/li li" data-ofbid = "d221262e319__20250121171647" >
< p class = "- topic/p p" data-ofbid = "d221262e321__20250121171647" > 直接访问 Flash， < / p >
< / li > < li class = "- topic/li li" data-ofbid = "d221262e324__20250121171647" >
< p class = "- topic/p p" data-ofbid = "d221262e326__20250121171647" > FATFS 访问 Flash， < / p >
< / li > < li class = "- topic/li li" data-ofbid = "d221262e329__20250121171647" >
< p class = "- topic/p p" data-ofbid = "d221262e331__20250121171647" > LittleFS 访问 Flash， < / p >
< / li > < / ul > < / li > < / ul >
< div class = "table-container" > < table class = "- topic/table table longtable colwidths-given docutils align-default frame-all" id = "id__id11" data-ofbid = "id__id11" data-cols = "5" > < caption class = "- topic/title title tablecap" data-caption-side = "top" data-is-repeated = "true" > < span class = "table--title-label" > 表< span class = "table--title-label-number" > 2< / span > < span class = "table--title-label-punctuation" > . < / span > < / span > < span class = "table--title" > SPINAND 上的分区、设备和文件系统< / span > < / caption > < colgroup > < col style = "width:11.014176663031625%" / > < col style = "width:14.394765539803709%" / > < col style = "width:14.067611777535442%" / > < col style = "width:10.905125408942203%" / > < col style = "width:49.61832061068702%" / > < / colgroup > < thead class = "- topic/thead thead" > < tr class = "- topic/row" > < th class = "- topic/entry entry colsep-1 rowsep-1" id = "id__id11__entry__1" > 分区名字< / th > < th class = "- topic/entry entry colsep-1 rowsep-1" id = "id__id11__entry__2" > MTD 设备名< / th > < th class = "- topic/entry entry colsep-1 rowsep-1" id = "id__id11__entry__3" > 块设备名< / th > < th class = "- topic/entry entry colsep-1 rowsep-1" id = "id__id11__entry__4" > 文件系统< / th > < th class = "- topic/entry entry colsep-0 rowsep-1" id = "id__id11__entry__5" > 备注< / th > < / tr > < / thead > < tbody class = "- topic/tbody tbody" > < tr class = "- topic/row" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id11__entry__1" > "spl"
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id11__entry__2" > "spl"
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id11__entry__3" > -< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id11__entry__4" > -< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__id11__entry__5" > -< / td > < / tr > < tr class = "- topic/row" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id11__entry__1" > "os"
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id11__entry__2" > "os"
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id11__entry__3" > -< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id11__entry__4" > -< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__id11__entry__5" > -< / td > < / tr > < tr class = "- topic/row" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id11__entry__1" > "rodata"
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id11__entry__2" > "rodata"
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id11__entry__3" > "blk_rodata"
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id11__entry__4" > FATFS< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__id11__entry__5" > 通过 "blk_rodata" 设备访问 Flash， < / td > < / tr > < tr class = "- topic/row" > < td class = "- topic/entry entry colsep-1 rowsep-0" headers = "id__id11__entry__1" > "data"
< / td > < td class = "- topic/entry entry colsep-1 rowsep-0" headers = "id__id11__entry__2" > "data"
< / td > < td class = "- topic/entry entry colsep-1 rowsep-0" headers = "id__id11__entry__3" > "blk_data"
< / td > < td class = "- topic/entry entry colsep-1 rowsep-0" headers = "id__id11__entry__4" > FATFS< / td > < td class = "- topic/entry entry colsep-0 rowsep-0" headers = "id__id11__entry__5" >
< p class = "- topic/p p" data-ofbid = "d221262e401__20250121171647" > "blk_data"设备是通过 NFTL 层创建，< / p >
< p class = "- topic/p p" data-ofbid = "d221262e404__20250121171647" > FATFS 访问 "blk_data" 时，通过 NFTL 访问 Flash。< / p >
< / td > < / tr > < / tbody > < / table > < / div >
< ul class = "- topic/ul ul" id = "id__ul_s5j_3nq_gdc" data-ofbid = "id__ul_s5j_3nq_gdc" > < li class = "- topic/li li" data-ofbid = "d221262e410__20250121171647" > 分区名：< ul class = "- topic/ul ul" id = "id__ul_wlb_5ky_5cc" data-ofbid = "id__ul_wlb_5ky_5cc" > < li class = "- topic/li li" data-ofbid = "d221262e413__20250121171647" > "spl"：分区及其设备名，"spl" 分区主要用于存储
二次引导加载程序，是系统启动的第一个阶段所加载的程序。< / li > < li class = "- topic/li li" data-ofbid = "d221262e415__20250121171647" > "os"： < / li > < li class = "- topic/li li" data-ofbid = "d221262e417__20250121171647" > "rodata"：
分区，主要用于存储只读数据，包括系统在运行时需要读取但不修改的配置信息等。< / li > < li class = "- topic/li li" data-ofbid = "d221262e419__20250121171647" > "data"：
分区，用来存储可变数据，如用户生成的数据或系统运行时产生的临时数据。< / li > < / ul > < / li > < li class = "- topic/li li" data-ofbid = "d221262e421__20250121171647" > MTD 设备名：对 Flash 的底层直接访问，便于进行读写硬件等操作。< / li > < li class = "- topic/li li" data-ofbid = "d221262e423__20250121171647" > 块设备名：通过将物理存储抽象为块设备，简化了对文件系统的操作。"blk_rodata" 和
"blk_data" 分别支持对 "rodata" 和
"data" 分区的文件系统访问。< / li > < li class = "- topic/li li" data-ofbid = "d221262e425__20250121171647" > 文件系统："rodata" 分区使用 FATFS
文件系统，使得数据以文件的形式进行存储和管理。"data" 分区使用 FATFS 文件系统。< / li > < li class = "- topic/li li" data-ofbid = "d221262e427__20250121171647" > NFTL 层：网络闪存转换层，主要用来将 Flash 的物理特性映射为一般块设备，便于 FATFS 等文件系统无需关心底层 NAND Flash
的具体特性。< div class = "- topic/note note note note_note" id = "id__note_dr3_4mq_gdc" data-ofbid = "id__note_dr3_4mq_gdc" > < span class = "note__title" > 注：< / span >
< p class = "- topic/p p" data-ofbid = "d221262e431__20250121171647" > 建议只设置一个使用 NFTL 的分区，并且分区不要太小。因为 NFTL 需要预留至少 6 MB 空间做坏块管理。< / p >
< / div > < / li > < li class = "- topic/li li" data-ofbid = "d221262e434__20250121171647" > 访问规则：< ul class = "- topic/ul ul" id = "id__ul_oxj_f5n_hdc" data-ofbid = "id__ul_oxj_f5n_hdc" > < li class = "- topic/li li" data-ofbid = "d221262e437__20250121171647" >
< p class = "- topic/p p" data-ofbid = "d221262e439__20250121171647" > 直接访问 Flash， < / p >
< / li > < li class = "- topic/li li" data-ofbid = "d221262e442__20250121171647" >
< p class = "- topic/p p" data-ofbid = "d221262e444__20250121171647" > FATFS 访问 Flash， ， < / p >
< / li > < / ul > < / li > < / ul >
< div class = "table-container" > < table class = "- topic/table table longtable colwidths-given docutils align-default frame-all" id = "id__id12" data-ofbid = "id__id12" data-cols = "5" > < caption class = "- topic/title title tablecap" data-caption-side = "top" data-is-repeated = "true" > < span class = "table--title-label" > 表< span class = "table--title-label-number" > 3< / span > < span class = "table--title-label-punctuation" > . < / span > < / span > < span class = "table--title" > eMMC 上的分区、设备和文件系统< / span > < / caption > < colgroup > < col style = "width:16.770186335403725%" / > < col style = "width:16.770186335403725%" / > < col style = "width:16.770186335403725%" / > < col style = "width:12.422360248447204%" / > < col style = "width:37.267080745341616%" / > < / colgroup > < thead class = "- topic/thead thead" > < tr class = "- topic/row" > < th class = "- topic/entry entry colsep-1 rowsep-1" id = "id__id12__entry__1" > 分区名字< / th > < th class = "- topic/entry entry colsep-1 rowsep-1" id = "id__id12__entry__2" > MTD 设备名< / th > < th class = "- topic/entry entry colsep-1 rowsep-1" id = "id__id12__entry__3" > 块设备名< / th > < th class = "- topic/entry entry colsep-1 rowsep-1" id = "id__id12__entry__4" > 文件系统< / th > < th class = "- topic/entry entry colsep-0 rowsep-1" id = "id__id12__entry__5" > 备注< / th > < / tr > < / thead > < tbody class = "- topic/tbody tbody" > < tr class = "- topic/row" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id12__entry__1" > "spl"
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id12__entry__2" > -< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id12__entry__3" > < code class = "+ topic/ph pr-d/codeph ph codeph" > mmc0p0< / code >
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id12__entry__4" > -< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__id12__entry__5" > -< / td > < / tr > < tr class = "- topic/row" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id12__entry__1" > "os"
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id12__entry__2" > -< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id12__entry__3" > < code class = "+ topic/ph pr-d/codeph ph codeph" > mmc0p1< / code >
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id12__entry__4" > -< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__id12__entry__5" > -< / td > < / tr > < tr class = "- topic/row" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id12__entry__1" > "rodata"
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id12__entry__2" > -< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id12__entry__3" > < code class = "+ topic/ph pr-d/codeph ph codeph" > mmc0p2< / code >
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__id12__entry__4" > FATFS< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__id12__entry__5" > 此处的分区排序仅为示例< / td > < / tr > < tr class = "- topic/row" > < td class = "- topic/entry entry colsep-1 rowsep-0" headers = "id__id12__entry__1" > "data"
< / td > < td class = "- topic/entry entry colsep-1 rowsep-0" headers = "id__id12__entry__2" > -< / td > < td class = "- topic/entry entry colsep-1 rowsep-0" headers = "id__id12__entry__3" > < code class = "+ topic/ph pr-d/codeph ph codeph" > mmc0p3< / code >
< / td > < td class = "- topic/entry entry colsep-1 rowsep-0" headers = "id__id12__entry__4" > FATFS< / td > < td class = "- topic/entry entry colsep-0 rowsep-0" headers = "id__id12__entry__5" > 此处的分区排序仅为示例< / td > < / tr > < / tbody > < / table > < / div >
< ul class = "- topic/ul ul" id = "id__ul_gtf_yly_5cc" data-ofbid = "id__ul_gtf_yly_5cc" > < li class = "- topic/li li" data-ofbid = "d221262e524__20250121171647" > < strong class = "+ topic/ph hi-d/b ph b" > 分区名< / strong > ： < ul class = "- topic/ul ul" id = "id__ul_htf_yly_5cc" data-ofbid = "id__ul_htf_yly_5cc" > < li class = "- topic/li li" data-ofbid = "d221262e529__20250121171647" > "spl"：分区及其设备名，"spl" 分区主要用于存储
二次引导加载程序，是系统启动的第一个阶段所加载的程序。< / li > < li class = "- topic/li li" data-ofbid = "d221262e531__20250121171647" > "os"： < / li > < li class = "- topic/li li" data-ofbid = "d221262e533__20250121171647" > "rodata" ：
分区，主要用于存储只读数据，包括系统在运行时需要读取但不修改的配置信息等。< / li > < li class = "- topic/li li" data-ofbid = "d221262e535__20250121171647" > "data"：
分区，用来存储可变数据，如用户生成的数据或系统运行时产生的临时数据。< / li > < / ul > < / li > < li class = "- topic/li li" data-ofbid = "d221262e537__20250121171647" > MTD 设备名：对 Flash 的底层直接访问，便于进行读写硬件等操作。< / li > < li class = "- topic/li li" data-ofbid = "d221262e539__20250121171647" > 块设备名：块设备按照分区顺序从 0 开始编号，例如从 mmc0p0 到 mmc0p3。每个块设备代表 eMMC
中的一个分区，简化了物理存储到逻辑存储的映射，便于后续的文件系统管理。< / li > < li class = "- topic/li li" data-ofbid = "d221262e541__20250121171647" > 文件系统："rodata" 和 "data" 分区均使用 FATFS 文件系统。< / li > < li class = "- topic/li li" data-ofbid = "d221262e543__20250121171647" > 访问规则：块设备的命名，按照分区的排序从 0 开始编号< / li > < / ul >
< / section > < section class = "- topic/section section" id = "id__section_xdj_cnq_gdc" data-ofbid = "id__section_xdj_cnq_gdc" > < h2 class = "- topic/title title sectiontitle" > 修改分区< / h2 >
< p class = "- topic/p p" data-ofbid = "d221262e551__20250121171647" > < span class = "+ topic/ph sw-d/filepath ph filepath" > image_cfg.json< / span >
文件是设置分区信息以及如何生成烧录镜像文件的配置文件，由于分区和烧录信息是相互关联的，因此在一个文件中进行配置。
< span class = "+ topic/ph sw-d/filepath ph filepath" > image_cfg.json< / span > 文件的保存路径为
< span class = "+ topic/ph sw-d/filepath ph filepath" > target/< var class = "+ topic/keyword sw-d/varname keyword varname" > chip< / var > /< var class = "+ topic/keyword sw-d/varname keyword varname" > board< / var > /pack/image_cfg.json< / span > 。< / p >
< div class = "- topic/p p" data-ofbid = "d221262e568__20250121171647" > 分区数值的书写规则如下：< ul class = "- topic/ul ul simple" id = "id__ul_hzh_tsy_5cc" data-ofbid = "id__ul_hzh_tsy_5cc" > < li class = "- topic/li li" data-ofbid = "d221262e571__20250121171647" >
< p class = "- topic/p p" data-ofbid = "d221262e573__20250121171647" > 不带单位，表示字节< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d221262e576__20250121171647" >
< p class = "- topic/p p" data-ofbid = "d221262e578__20250121171647" > 可以使用单位 k 或者 K< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d221262e581__20250121171647" >
< p class = "- topic/p p" data-ofbid = "d221262e583__20250121171647" > 可以使用单位 m 或者 M< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d221262e586__20250121171647" >
< p class = "- topic/p p" data-ofbid = "d221262e588__20250121171647" > 可以使用单位 g 或者 G< / p >
< / li > < / ul > < / div >
< p class = "- topic/p p" data-ofbid = "d221262e592__20250121171647" > 输入分区 "size" 值时，需要注意存储介质的对齐要求：< / p >
< ul class = "- topic/ul ul simple" id = "id__ul_ufy_5sy_5cc" data-ofbid = "id__ul_ufy_5sy_5cc" > < li class = "- topic/li li" data-ofbid = "d221262e596__20250121171647" >
< p class = "- topic/p p" data-ofbid = "d221262e598__20250121171647" > SPINOR: 与最小擦除块大小对齐，一般为 4K 或者 64K， < / p >
< / li > < li class = "- topic/li li" data-ofbid = "d221262e601__20250121171647" >
< p class = "- topic/p p" data-ofbid = "d221262e603__20250121171647" > SPINAND: 与最小擦除块大小对齐，一般为 128K 或者 256K， < / p >
< / li > < li class = "- topic/li li" data-ofbid = "d221262e606__20250121171647" >
< p class = "- topic/p p" data-ofbid = "d221262e608__20250121171647" > eMMC: 需要 512 字节对齐。< / p >
< / li > < / ul >
< div class = "- topic/p p" data-ofbid = "d221262e613__20250121171647" > 分区设置步骤和流程如下所示：< ol class = "- topic/ol ol" id = "id__ul_sf5_3sy_5cc" data-ofbid = "id__ul_sf5_3sy_5cc" > < li class = "- topic/li li" data-ofbid = "d221262e616__20250121171647" > 在 < span class = "+ topic/ph sw-d/filepath ph filepath" > image_cfg.json< / span >
文件中查找对应媒介的分区配置信息。< div class = "- topic/p p" data-ofbid = "d221262e621__20250121171647" > < span class = "+ topic/ph sw-d/filepath ph filepath" > image_cfg.json< / span >
文件是设置分区信息以及配置烧录镜像文件生成方式的配置文件，保存路径为
< span class = "+ topic/ph sw-d/filepath ph filepath" > target/< var class = "+ topic/keyword sw-d/varname keyword varname" > chip< / var > /< var class = "+ topic/keyword sw-d/varname keyword varname" > board< / var > /pack/image_cfg.json< / span > 。< ul class = "- topic/ul ul" id = "id__ul_sn5_5yy_5cc" data-ofbid = "id__ul_sn5_5yy_5cc" > < li class = "- topic/li li" data-ofbid = "d221262e635__20250121171647" > < var class = "+ topic/keyword sw-d/varname keyword varname" > chip< / var > 为对应芯片型号。< / li > < li class = "- topic/li li" data-ofbid = "d221262e639__20250121171647" > < var class = "+ topic/keyword sw-d/varname keyword varname" > board< / var > 为芯片开发板型号。< / li > < / ul > < / div > < div class = "- topic/p p" data-ofbid = "d221262e643__20250121171647" > 以下以 SPI NAND 的分区配置为例：< div class = "- topic/note note note note_note" id = "id__note_d4b_1zy_5cc" data-ofbid = "id__note_d4b_1zy_5cc" > < span class = "note__title" > 注：< / span > 对于 SPI NAND
Flash 的分区配置，需要注意 NFTL
分区的配置方法。< / div > < pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "id__codeblock_t5q_gty_5cc" data-ofbid = "id__codeblock_t5q_gty_5cc" > < span class = "hl-string" > "spi-nand"< / span > : {
< span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "128m"< / span > , < em class = "hl-comment" > // Size of SPI NAND< / em >
< span class = "hl-string" > "partitions"< / span > : {
< span class = "hl-string" > "spl"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "1m"< / span > },
< span class = "hl-string" > "env"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "256k"< / span > },
< span class = "hl-string" > "env_r"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "256k"< / span > },
< span class = "hl-string" > "os"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "4m"< / span > },
< span class = "hl-string" > "os_r"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "4m"< / span > },
< span class = "hl-string" > "rodata"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "12m"< / span > },
< span class = "hl-string" > "rodata_r"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "12m"< / span > },
< span class = "hl-string" > "data"< / span > : {
< span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "40m"< / span > ,
< span class = "hl-string" > "nftl"< / span > : { < em class = "hl-comment" > // Volume in NFTL device< / em >
< span class = "hl-string" > "datavol"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "-"< / span > },
},
},
},
},< / pre > < / div > < / li > < li class = "- topic/li li" data-ofbid = "d221262e649__20250121171647" > 根据所需分区尺寸，修改对应的分区 "size" 值，否则可跳过此步。< div class = "- topic/p p" data-ofbid = "d221262e651__20250121171647" > 例如，将 "data" 分区中的 "size" 从 40M 修改为 50M
后，示例如下：< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "id__codeblock_ljq_rty_5cc" data-ofbid = "id__codeblock_ljq_rty_5cc" > < span class = "hl-string" > "spi-nand"< / span > : {
< span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "128m"< / span > , < em class = "hl-comment" > // Size of SPI NAND< / em >
< span class = "hl-string" > "partitions"< / span > : {
< span class = "hl-string" > "spl"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "1m"< / span > },
< span class = "hl-string" > "env"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "256k"< / span > },
< span class = "hl-string" > "env_r"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "256k"< / span > },
< span class = "hl-string" > "os"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "4m"< / span > },
< span class = "hl-string" > "os_r"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "4m"< / span > },
< span class = "hl-string" > "rodata"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "12m"< / span > },
< span class = "hl-string" > "rodata_r"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "12m"< / span > },
< span class = "hl-string" > "data"< / span > : {
< span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "50m"< / span > ,
< span class = "hl-string" > "nftl"< / span > : { < em class = "hl-comment" > // Volume in NFTL device< / em >
< span class = "hl-string" > "datavol"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "-"< / span > },
},
},
},
},< / pre > < / div > < / li > < li class = "- topic/li li" data-ofbid = "d221262e655__20250121171647" > 如需新增一个分区，在所需位置添加一行配置即可，否则可跳过此步。< div class = "- topic/p p" data-ofbid = "d221262e657__20250121171647" > 例如，新增一个 "user"
分区，示例如下：< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "id__codeblock_j4c_pty_5cc" data-ofbid = "id__codeblock_j4c_pty_5cc" > < span class = "hl-string" > "spi-nand"< / span > : {
< span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "128m"< / span > , < em class = "hl-comment" > // Size of SPI NAND< / em >
< span class = "hl-string" > "partitions"< / span > : {
< span class = "hl-string" > "spl"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "1m"< / span > },
< span class = "hl-string" > "env"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "256k"< / span > },
< span class = "hl-string" > "env_r"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "256k"< / span > },
< span class = "hl-string" > "os"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "4m"< / span > },
< span class = "hl-string" > "os_r"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "4m"< / span > },
< span class = "hl-string" > "rodata"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "12m"< / span > },
< span class = "hl-string" > "rodata_r"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "12m"< / span > },
< span class = "hl-string" > "user"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "20m"< / span > }, < em class = "hl-comment" > // 新添加的分区< / em >
< span class = "hl-string" > "data"< / span > : {
< span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "50m"< / span > ,
< span class = "hl-string" > "nftl"< / span > : { < em class = "hl-comment" > // Volume in NFTL device< / em >
< span class = "hl-string" > "datavol"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "20m"< / span > },
},
},
},
},< / pre > < / div > < / li > < li class = "- topic/li li" data-ofbid = "d221262e661__20250121171647" > 如果新增的分区需要烧录预制内容，在 "target" 段中新增配置。< div class = "- topic/note note note note_note" id = "id__note_ddm_kyy_5cc" data-ofbid = "id__note_ddm_kyy_5cc" > < span class = "note__title" > 注：< / span > 对于分区表中的分区，如果没有在 "target" 段中设置需要烧录的数据，则在烧录过程中，该分区不会被擦除和修改。< / div > < div class = "- topic/p p" data-ofbid = "d221262e665__20250121171647" >
< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "id__codeblock_yrb_jyy_5cc" data-ofbid = "id__codeblock_yrb_jyy_5cc" > < span class = "hl-string" > "target"< / span > : { < em class = "hl-comment" > // Image components which will be burn to device's partitions< / em >
< span class = "hl-string" > "spl"< / span > : {
< span class = "hl-string" > "file"< / span > : < span class = "hl-string" > "bootloader.aic"< / span > ,
< span class = "hl-string" > "attr"< / span > : [< span class = "hl-string" > "required"< / span > ],
< span class = "hl-string" > "part"< / span > : [< span class = "hl-string" > "spl"< / span > ]
},
...
< span class = "hl-string" > "mydata"< / span > : { < em class = "hl-comment" > // 此处组件名字可自定义< / em >
< span class = "hl-string" > "file"< / span > : < span class = "hl-string" > "userdata.bin"< / span > , < em class = "hl-comment" > // 此处为要烧录到分区的数据< / em >
< span class = "hl-string" > "attr"< / span > : [< span class = "hl-string" > "mtd"< / span > , < span class = "hl-string" > "optional"< / span > ],
< span class = "hl-string" > "part"< / span > : [< span class = "hl-string" > "user"< / span > ] < em class = "hl-comment" > // 此处设置要烧录的分区名字< / em >
},
},< / pre >
< / div > < / li > < li class = "- topic/li li" data-ofbid = "d221262e670__20250121171647" > 如需删除一个分区，删除对应的分区配置行即可。< div class = "- topic/p p" data-ofbid = "d221262e672__20250121171647" > 例如，删除新增的 "user"
分区，示例如下：< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "id__codeblock_ups_nyy_5cc" data-ofbid = "id__codeblock_ups_nyy_5cc" > < span class = "hl-string" > "spi-nand"< / span > : {
< span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "128m"< / span > , < em class = "hl-comment" > // Size of SPI NAND< / em >
< span class = "hl-string" > "partitions"< / span > : {
< span class = "hl-string" > "spl"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "1m"< / span > },
< span class = "hl-string" > "env"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "256k"< / span > },
< span class = "hl-string" > "env_r"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "256k"< / span > },
< span class = "hl-string" > "os"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "4m"< / span > },
< span class = "hl-string" > "os_r"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "4m"< / span > },
< span class = "hl-string" > "rodata"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "12m"< / span > },
< span class = "hl-string" > "rodata_r"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "12m"< / span > },
< span class = "hl-string" > "data"< / span > : {
< span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "50m"< / span > ,
< span class = "hl-string" > "nftl"< / span > : { < em class = "hl-comment" > // Volume in NFTL device< / em >
< span class = "hl-string" > "datavol"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "20m"< / span > },
},
},
},
},< / pre > < / div > < div class = "- topic/note note note note_note" id = "id__note_ipr_syy_5cc" data-ofbid = "id__note_ipr_syy_5cc" > < span class = "note__title" > 注：< / span >
< p class = "- topic/p p" data-ofbid = "d221262e678__20250121171647" > 检查 < code class = "+ topic/ph pr-d/codeph ph codeph" > target< / code > 段中是否有使用该分区，如果有，则删除相关的配置。< / p >
< / div > < / li > < / ol > < / div >
< / section > < section class = "- topic/section section" id = "id__id6" data-ofbid = "id__id6" > < h2 class = "- topic/title title sectiontitle" > 分区配置示例
< / h2 > < div class = "- topic/p p" data-ofbid = "d221262e688__20250121171647" > < span class = "+ topic/ph sw-d/filepath ph filepath" > image_cfg.json< / span > 文件是设置分区信息以及配置烧录镜像文件生成方式的配置文件。由于分区和烧录信息是相互关联的，因此在一个文件中进行配置。
< span class = "+ topic/ph sw-d/filepath ph filepath" > image_cfg.json< / span > 文件的保存路径为
< span class = "+ topic/ph sw-d/filepath ph filepath" > target/< var class = "+ topic/keyword sw-d/varname keyword varname" > chip< / var > /< var class = "+ topic/keyword sw-d/varname keyword varname" > board< / var > /pack/image_cfg.json< / span > 。< ul class = "- topic/ul ul" id = "id__ul_eqf_lqy_5cc" data-ofbid = "id__ul_eqf_lqy_5cc" > < li class = "- topic/li li" data-ofbid = "d221262e705__20250121171647" > < var class = "+ topic/keyword sw-d/varname keyword varname" > chip< / var > 为对应芯片型号。< / li > < li class = "- topic/li li" data-ofbid = "d221262e709__20250121171647" > < var class = "+ topic/keyword sw-d/varname keyword varname" > board< / var > 为芯片开发板型号。< / li > < / ul > < / div > < div class = "- topic/div div section" id = "id__id7" >
< p class = "- topic/p p" data-ofbid = "d221262e715__20250121171647" > < strong class = "+ topic/ph hi-d/b ph b" > SPINOR 的分区配置示例< / strong > ： < / p >
< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" data-ofbid = "d221262e720__20250121171647" > < span class = "hl-string" > "spi-nor"< / span > : {
< span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "16m"< / span > , < em class = "hl-comment" > // Size of SPI NOR< / em >
< span class = "hl-string" > "partitions"< / span > : {
< span class = "hl-string" > "spl"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "256k"< / span > },
< span class = "hl-string" > "env"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "128k"< / span > },
< span class = "hl-string" > "env_r"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "128k"< / span > },
< span class = "hl-string" > "os"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "1m"< / span > },
< span class = "hl-string" > "os_r"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "1m"< / span > },
< span class = "hl-string" > "rodata"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "3m"< / span > },
< span class = "hl-string" > "rodata_r"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "3m"< / span > },
< span class = "hl-string" > "data"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "7m"< / span > }
},
},
< / pre >
< div class = "- topic/div div" >
< div class = "- topic/p p" data-ofbid = "d221262e725__20250121171647" > < strong class = "+ topic/ph hi-d/b ph b" > SPINAND Flash 的分区配置示例< / strong > ： < div class = "- topic/note note note note_note" id = "id__note_gtq_fqq_3dc" data-ofbid = "id__note_gtq_fqq_3dc" > < span class = "note__title" > 注：< / span > 对于 SPINAND Flash
的分区配置，需要注意 NFTL 分区的配置方法。< / div > < / div >
< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "id__codeblock_r2y_qqq_3dc" data-ofbid = "id__codeblock_r2y_qqq_3dc" > < span class = "hl-string" > "spi-nand"< / span > : {
< span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "128m"< / span > , < em class = "hl-comment" > // Size of SPI NAND< / em >
< span class = "hl-string" > "partitions"< / span > : {
< span class = "hl-string" > "spl"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "1m"< / span > },
< span class = "hl-string" > "env"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "256k"< / span > },
< span class = "hl-string" > "env_r"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "256k"< / span > },
< span class = "hl-string" > "os"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "4m"< / span > },
< span class = "hl-string" > "os_r"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "4m"< / span > },
< span class = "hl-string" > "rodata"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "12m"< / span > },
< span class = "hl-string" > "rodata_r"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "12m"< / span > },
< span class = "hl-string" > "data"< / span > : {
< span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "40m"< / span > ,
< span class = "hl-string" > "nftl"< / span > : { < em class = "hl-comment" > // Volume in NFTL device< / em >
< span class = "hl-string" > "datavol"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "-"< / span > },
},
},
},
},
< / pre >
< div class = "- topic/p p" data-ofbid = "d221262e735__20250121171647" > 上述示例中， "data" 分区的配置了如下内容：< ul class = "- topic/ul ul" id = "id__ul_i5x_fry_5cc" data-ofbid = "id__ul_i5x_fry_5cc" > < li class = "- topic/li li" data-ofbid = "d221262e738__20250121171647" > "size"： < / li > < li class = "- topic/li li" data-ofbid = "d221262e740__20250121171647" > "nftl" 设备：< ul class = "- topic/ul ul" id = "id__ul_qv2_hry_5cc" data-ofbid = "id__ul_qv2_hry_5cc" > < li class = "- topic/li li" data-ofbid = "d221262e743__20250121171647" > "datavol"： < / li > < / ul > < ul class = "- topic/ul ul" id = "id__ul_phz_hry_5cc" data-ofbid = "id__ul_phz_hry_5cc" > < li class = "- topic/li li" data-ofbid = "d221262e746__20250121171647" > "size"：“-” 表示卷的大小是 NFTL 设备的所有剩余存储空间。< p class = "- topic/p p" data-ofbid = "d221262e748__20250121171647" > NFTL 设备需要使用大约 6 MB
的空间做坏块管理，因此 “datavol” 的可用大小大约为 34 MB。< / p > < / li > < / ul > < / li > < / ul > < / div >
< / div >
< div class = "- topic/div div" >
< div class = "- topic/p p" data-ofbid = "d221262e754__20250121171647" > < strong class = "+ topic/ph hi-d/b ph b" > eMMC 的分区配置示例< / strong > ： < div class = "- topic/note note note note_note" id = "id__note_a1x_sry_5cc" data-ofbid = "id__note_a1x_sry_5cc" > < span class = "note__title" > 注：< / span > 第一个分区的开始位置。eMMC
使用 GPT 分区表格式，需要在 eMMC 的开始和末尾都预留 17K 的空间存放 GPT 信息，因此 “spl” 的开始位置为
“0x4400”。< / div > < / div >
< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "id__codeblock_pgz_rqq_3dc" data-ofbid = "id__codeblock_pgz_rqq_3dc" > < span class = "hl-string" > "mmc"< / span > : {
< span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "8G"< / span > , < em class = "hl-comment" > // Size of SD/eMMC< / em >
< span class = "hl-string" > "partitions"< / span > : {
< span class = "hl-string" > "spl"< / span > : { < span class = "hl-string" > "offset"< / span > : < span class = "hl-string" > "0x4400"< / span > , < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "256k"< / span > },
< span class = "hl-string" > "os"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "1m"< / span > },
< span class = "hl-string" > "rodata"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "3m"< / span > },
< span class = "hl-string" > "data"< / span > : { < span class = "hl-string" > "size"< / span > : < span class = "hl-string" > "5m"< / span > }
},
},
< / pre >
< p class = "- topic/p p" data-ofbid = "d221262e767__20250121171647" > 每一个分区的配置项中，都有 "offset" 和 "size" 两个配置信息，其中 "offset" 用于配置该分区的开始位置。 如未设置
"offset"，表示该分区紧跟上一个分区之后。< / p >
< / div >
< / div > < / section > < / div > < / article > < / main > < / div >
< / div >
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< div class = " wh_topic_toc " > < div class = "wh_topic_label" > 在本页上< / div > < ul > < li class = "section-item" > < div class = "section-title" > < a href = "#id__section_k1p_zlq_gdc" data-tocid = "id__section_k1p_zlq_gdc" > 启动分区< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#id__section_cpt_fmq_gdc" data-tocid = "id__section_cpt_fmq_gdc" > 数据分区< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#id__section_n5m_gmq_gdc" data-tocid = "id__section_n5m_gmq_gdc" > 系统 A/B 分区< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#id__id5" data-tocid = "id__id5" > 分区与存储设备关系< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#id__section_xdj_cnq_gdc" data-tocid = "id__section_xdj_cnq_gdc" > 修改分区< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#id__id6" data-tocid = "id__id6" > 分区配置示例
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