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Read time: 6 minute(s)
< / div > < div class = "- topic/body body" > < section class = "- topic/section section" id = "id__section_jvr_j1q_wcc" data-ofbid = "id__section_jvr_j1q_wcc" > < h2 class = "- topic/title title sectiontitle" > OTA 文件结构< / h2 >
< ul class = "- topic/ul ul" id = "id__ul_cnc_jfv_1dc" data-ofbid = "id__ul_cnc_jfv_1dc" > < li class = "- topic/li li" data-ofbid = "d246117e27__20250121171701" > OTA 源码位于 < span class = "- topic/ph ph" > Luban-Lite< / span > 根目录中的< span class = "+ topic/ph sw-d/filepath ph filepath" > packages/artinchip/ota/< / span > 文件夹
，文件结构如下:< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "id__pre_gyg_jfv_1dc" data-ofbid = "id__pre_gyg_jfv_1dc" > ├── absystem.c # 文件系统挂载源文件
├── absystem.h
├── burn.c # FLASH 固化接口源文件
├── burn.h
├── ota.c # OTA 接口源文件
├── ota.h
└── test_ota.c # 测试 TF 卡 OTA 源文件< / pre > < / li > < li class = "- topic/li li" data-ofbid = "d246117e37__20250121171701" > OTA 升级过程中使用到的相关文件位于各个 < span class = "+ topic/ph sw-d/filepath ph filepath" > target/xx-chip/xx-board/pack< / span >
板级目录中，文件结构如下：< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "id__pre_zgg_cfv_1dc" data-ofbid = "id__pre_zgg_cfv_1dc" > ├── bootloader.bin # 引导加载程序，用于启动系统。
├── ddr_init.json # DDR 初始化配置文件，用于配置内存参数。
├── env.txt # 环境变量文件，用于环境变量存放。
├── image_cfg.json # 系统分区配置文件，用作定义系统分区信息。
└── ota-subimgs.cfg # OTA 升级包配置文件，用于指定需要更新的子镜像及其顺序< / pre > < / li > < / ul >
< / section > < section class = "- topic/section section" id = "id__section_zfn_qfv_1dc" data-ofbid = "id__section_zfn_qfv_1dc" > < h2 class = "- topic/title title sectiontitle" > A/B 系统分区信息< / h2 >
< figure class = "- topic/fig fig fignone" id = "id__fig_rr5_wgv_1dc" data-ofbid = "id__fig_rr5_wgv_1dc" > < br / > < div class = "imagecenter" > < img class = "- topic/image image imagecenter" id = "id__image_agn_qfv_1dc" src = "../../../images/ota/part_lite.png" alt = "part" / > < / div > < br / > < figcaption data-caption-side = "bottom" class = "- topic/title title figcapcenter" > < span class = "figtitleprefix fig--title-label" > 图< span class = "fig--title-label-number" > 1< / span > < span class = "fig--title-label-punctuation" > . < / span > < / span > < span class = "fig--title" > A/B 系统方案分区信息 < / span > < / figcaption > < / figure >
< p class = "- topic/p p" data-ofbid = "d246117e57__20250121171701" > 如< a class = "- topic/xref xref" href = "ota_design.html#id__fig_rr5_wgv_1dc" > ota_design.html#id__fig_rr5_wgv_1dc< / a > 所示，各分区详细描述如下：< / p >
< ul class = "- topic/ul ul arabic simple" id = "id__ol_bgn_qfv_1dc" data-ofbid = "id__ol_bgn_qfv_1dc" > < li class = "- topic/li li" data-ofbid = "d246117e63__20250121171701" >
< p class = "- topic/p p" data-ofbid = "d246117e65__20250121171701" > ENV 分区：用来保存 < a class = "- topic/xref xref" href = "ota_design.html#id__section_k5j_33v_1dc" > env
环境变量< / a > ，其中增加了一个备用 ENV 分区，确保在一份数据破坏后，另外一份数据还能继续使用。< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d246117e72__20250121171701" >
< p class = "- topic/p p" data-ofbid = "d246117e74__20250121171701" > OS， < / p >
< / li > < li class = "- topic/li li" data-ofbid = "d246117e77__20250121171701" >
< p class = "- topic/p p" data-ofbid = "d246117e79__20250121171701" > 用户可根据实际 OTA 需求< a class = "- topic/xref xref" href = "ota_faq.html#id__section_nzj_fhv_1dc" > 剪裁分区< / a > ，例如只需升级
OS， < / p >
< / li > < / ul >
< / section > < section class = "- topic/section section" id = "id__section_i4m_hjv_1dc" data-ofbid = "id__section_i4m_hjv_1dc" > < h2 class = "- topic/title title sectiontitle" > OTA 分区说明< / h2 >
< div class = "table-container" > < table class = "- topic/table table docutils align-default frame-all" id = "id__table_rgn_qfv_1dc" data-ofbid = "id__table_rgn_qfv_1dc" data-cols = "3" > < 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" > NAND 分区说明< / span > < / caption > < colgroup > < col style = "width:18.832391713747647%" / > < col style = "width:35.781544256120526%" / > < col style = "width:45.38606403013182%" / > < / colgroup > < thead class = "- topic/thead thead" > < tr class = "- topic/row row-odd" > < th class = "- topic/entry entry head colsep-1 rowsep-1" id = "id__table_rgn_qfv_1dc__entry__1" > 设备名称< / th > < th class = "- topic/entry entry head colsep-1 rowsep-1" id = "id__table_rgn_qfv_1dc__entry__2" > 定义< / th > < th class = "- topic/entry entry head colsep-0 rowsep-1" id = "id__table_rgn_qfv_1dc__entry__3" > 注释说明< / th > < / tr > < / thead > < tbody class = "- topic/tbody tbody" > < tr class = "- topic/row row-even" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_rgn_qfv_1dc__entry__1" > < span class = "+ topic/keyword pr-d/parmname keyword parmname" > os< / span >
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_rgn_qfv_1dc__entry__2" > 系统主分区 MTD 设备< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_rgn_qfv_1dc__entry__3" > 用于 A 系统烧录 OS< / td > < / tr > < tr class = "- topic/row row-odd" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_rgn_qfv_1dc__entry__1" > < span class = "+ topic/keyword pr-d/parmname keyword parmname" > os_r< / span >
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_rgn_qfv_1dc__entry__2" > 系统备份分区 MTD 设备< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_rgn_qfv_1dc__entry__3" > 用于 B 系统烧录 OS< / td > < / tr > < tr class = "- topic/row row-even" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_rgn_qfv_1dc__entry__1" > < span class = "+ topic/keyword pr-d/parmname keyword parmname" > blk_rodata< / span >
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_rgn_qfv_1dc__entry__2" > 只读文件系统主分区块设备< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_rgn_qfv_1dc__entry__3" > 用于 A 系统挂载只读文件系统< / td > < / tr > < tr class = "- topic/row row-odd" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_rgn_qfv_1dc__entry__1" > < span class = "+ topic/keyword pr-d/parmname keyword parmname" > blk_rodata_r< / span >
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_rgn_qfv_1dc__entry__2" > 只读文件系统备份分区块设备< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_rgn_qfv_1dc__entry__3" > 用于 B 系统挂载只读文件系统< / td > < / tr > < tr class = "- topic/row row-even" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_rgn_qfv_1dc__entry__1" > < span class = "+ topic/keyword pr-d/parmname keyword parmname" > blk_data< / span >
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_rgn_qfv_1dc__entry__2" > 读写文件系统主分区块设备< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_rgn_qfv_1dc__entry__3" > 用于 A 系统挂载与烧录读写文件系统< / td > < / tr > < tr class = "- topic/row row-odd" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_rgn_qfv_1dc__entry__1" > < span class = "+ topic/keyword pr-d/parmname keyword parmname" > blk_data_r< / span >
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_rgn_qfv_1dc__entry__2" > 读写文件系统备份分区块设备< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_rgn_qfv_1dc__entry__3" > 用于 B 系统挂载与烧录读写文件系统< / td > < / tr > < tr class = "- topic/row row-even" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_rgn_qfv_1dc__entry__1" > < span class = "+ topic/keyword pr-d/parmname keyword parmname" > rodata< / span >
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_rgn_qfv_1dc__entry__2" > 只读文件系统主分区 MTD 设备< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_rgn_qfv_1dc__entry__3" > 用于 A 系统烧录只读文件系统< / td > < / tr > < tr class = "- topic/row row-odd" > < td class = "- topic/entry entry colsep-1 rowsep-0" headers = "id__table_rgn_qfv_1dc__entry__1" > < span class = "+ topic/keyword pr-d/parmname keyword parmname" > rodata_r< / span >
< / td > < td class = "- topic/entry entry colsep-1 rowsep-0" headers = "id__table_rgn_qfv_1dc__entry__2" > 只读文件系统备份分区 MTD 设备< / td > < td class = "- topic/entry entry colsep-0 rowsep-0" headers = "id__table_rgn_qfv_1dc__entry__3" > 用于 B 系统烧录只读文件系统< / td > < / tr > < / tbody > < / table > < / div >
< div class = "table-container" > < table class = "- topic/table table docutils align-default frame-all" id = "id__table_sgn_qfv_1dc" data-ofbid = "id__table_sgn_qfv_1dc" data-cols = "3" > < 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" > NOR 分区说明< / span > < / caption > < colgroup > < col style = "width:19.53125%" / > < col style = "width:35.3515625%" / > < col style = "width:45.1171875%" / > < / colgroup > < thead class = "- topic/thead thead" > < tr class = "- topic/row row-odd" > < th class = "- topic/entry entry head colsep-1 rowsep-1" id = "id__table_sgn_qfv_1dc__entry__1" > 设备名称< / th > < th class = "- topic/entry entry head colsep-1 rowsep-1" id = "id__table_sgn_qfv_1dc__entry__2" > 定义< / th > < th class = "- topic/entry entry head colsep-0 rowsep-1" id = "id__table_sgn_qfv_1dc__entry__3" > 注释说明< / th > < / tr > < / thead > < tbody class = "- topic/tbody tbody" > < tr class = "- topic/row row-even" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_sgn_qfv_1dc__entry__1" > < span class = "+ topic/keyword pr-d/parmname keyword parmname" > os< / span >
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_sgn_qfv_1dc__entry__2" > 系统主分区 MTD 设备< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_sgn_qfv_1dc__entry__3" > 用于 A 系统烧录 OS< / td > < / tr > < tr class = "- topic/row row-odd" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_sgn_qfv_1dc__entry__1" > < span class = "+ topic/keyword pr-d/parmname keyword parmname" > os_r< / span >
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_sgn_qfv_1dc__entry__2" > 系统备份分区 MTD 设备< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_sgn_qfv_1dc__entry__3" > 用于 B 系统烧录 OS< / td > < / tr > < tr class = "- topic/row row-even" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_sgn_qfv_1dc__entry__1" > < span class = "+ topic/keyword pr-d/parmname keyword parmname" > blk_rodata< / span >
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_sgn_qfv_1dc__entry__2" > 只读文件系统主分区块设备< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_sgn_qfv_1dc__entry__3" > 用于 A 系统挂载只读文件系统< / td > < / tr > < tr class = "- topic/row row-odd" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_sgn_qfv_1dc__entry__1" > < span class = "+ topic/keyword pr-d/parmname keyword parmname" > blk_rodata_r< / span >
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_sgn_qfv_1dc__entry__2" > 只读文件系统备份分区块设备< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_sgn_qfv_1dc__entry__3" > 用于 B 系统挂载只读文件系统< / td > < / tr > < tr class = "- topic/row row-even" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_sgn_qfv_1dc__entry__1" > < span class = "+ topic/keyword pr-d/parmname keyword parmname" > rodata< / span >
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_sgn_qfv_1dc__entry__2" > 只读文件系统主分区 MTD 设备< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_sgn_qfv_1dc__entry__3" > 用于 A 系统烧录只读文件系统< / td > < / tr > < tr class = "- topic/row row-odd" > < td class = "- topic/entry entry colsep-1 rowsep-0" headers = "id__table_sgn_qfv_1dc__entry__1" > < span class = "+ topic/keyword pr-d/parmname keyword parmname" > rodata_r< / span >
< / td > < td class = "- topic/entry entry colsep-1 rowsep-0" headers = "id__table_sgn_qfv_1dc__entry__2" > 只读文件系统备份分区 MTD 设备< / td > < td class = "- topic/entry entry colsep-0 rowsep-0" headers = "id__table_sgn_qfv_1dc__entry__3" > 用于 B 系统烧录只读文件系统< / td > < / tr > < / tbody > < / table > < / div >
< div class = "table-container" > < table class = "- topic/table table docutils align-default frame-all" id = "id__table_tgn_qfv_1dc" data-ofbid = "id__table_tgn_qfv_1dc" data-cols = "3" > < 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 分区说明< / span > < / caption > < colgroup > < col style = "width:19.120458891013385%" / > < col style = "width:35.75525812619503%" / > < col style = "width:45.12428298279158%" / > < / colgroup > < thead class = "- topic/thead thead" > < tr class = "- topic/row row-odd" > < th class = "- topic/entry entry head colsep-1 rowsep-1" id = "id__table_tgn_qfv_1dc__entry__1" > 设备名称< / th > < th class = "- topic/entry entry head colsep-1 rowsep-1" id = "id__table_tgn_qfv_1dc__entry__2" > 定义< / th > < th class = "- topic/entry entry head colsep-0 rowsep-1" id = "id__table_tgn_qfv_1dc__entry__3" > 注释说明< / th > < / tr > < / thead > < tbody class = "- topic/tbody tbody" > < tr class = "- topic/row row-even" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_tgn_qfv_1dc__entry__1" > < span class = "+ topic/keyword pr-d/parmname keyword parmname" > mmc0p3< / span >
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_tgn_qfv_1dc__entry__2" > 系统主分区块设备< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_tgn_qfv_1dc__entry__3" > 用于 A 系统烧录 OS< / td > < / tr > < tr class = "- topic/row row-odd" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_tgn_qfv_1dc__entry__1" > < span class = "+ topic/keyword pr-d/parmname keyword parmname" > mmc0p4< / span >
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_tgn_qfv_1dc__entry__2" > 系统备份分区块设备< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_tgn_qfv_1dc__entry__3" > 用于 B 系统烧录 OS< / td > < / tr > < tr class = "- topic/row row-even" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_tgn_qfv_1dc__entry__1" > < span class = "+ topic/keyword pr-d/parmname keyword parmname" > mmc0p5< / span >
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_tgn_qfv_1dc__entry__2" > 只读文件系统主分区块设备< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_tgn_qfv_1dc__entry__3" > 用于 A 系统挂载与烧录只读文件系统< / td > < / tr > < tr class = "- topic/row row-odd" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_tgn_qfv_1dc__entry__1" > < span class = "+ topic/keyword pr-d/parmname keyword parmname" > mmc0p6< / span >
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_tgn_qfv_1dc__entry__2" > 只读文件系统备份分区块设备< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_tgn_qfv_1dc__entry__3" > 用于 B 系统挂载与烧录只读文件系统< / td > < / tr > < tr class = "- topic/row row-even" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_tgn_qfv_1dc__entry__1" > < span class = "+ topic/keyword pr-d/parmname keyword parmname" > mmc0p7< / span >
< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_tgn_qfv_1dc__entry__2" > 读写文件系统主分区块设备< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_tgn_qfv_1dc__entry__3" > 用于 A 系统挂载与烧录读写文件系统< / td > < / tr > < tr class = "- topic/row row-odd" > < td class = "- topic/entry entry colsep-1 rowsep-0" headers = "id__table_tgn_qfv_1dc__entry__1" > < span class = "+ topic/keyword pr-d/parmname keyword parmname" > mmc0p8< / span >
< / td > < td class = "- topic/entry entry colsep-1 rowsep-0" headers = "id__table_tgn_qfv_1dc__entry__2" > 读写文件系统备份分区块设备< / td > < td class = "- topic/entry entry colsep-0 rowsep-0" headers = "id__table_tgn_qfv_1dc__entry__3" > 用于 B 系统挂载与烧录读写文件系统< / td > < / tr > < / tbody > < / table > < / div >
< / section > < section class = "- topic/section section" id = "id__section_fk4_shv_1dc" data-ofbid = "id__section_fk4_shv_1dc" > < h2 class = "- topic/title title sectiontitle" > A/B 系统升级过程< / h2 >
< figure class = "- topic/fig fig fignone" id = "id__fig_oyd_phv_1dc" data-ofbid = "id__fig_oyd_phv_1dc" > < br / > < div class = "imagecenter" > < img class = "- topic/image image imagecenter" id = "id__image_fgn_qfv_1dc" src = "../../../images/ota/ab.png" alt = "ab" / > < / div > < br / > < figcaption data-caption-side = "bottom" class = "- topic/title title figcapcenter" > < span class = "figtitleprefix fig--title-label" > 图< span class = "fig--title-label-number" > 2< / span > < span class = "fig--title-label-punctuation" > . < / span > < / span > < span class = "fig--title" > A/B 系统升级过程< / span > < / figcaption > < / figure >
< ol class = "- topic/ol ol arabic simple" id = "id__ol_ggn_qfv_1dc" data-ofbid = "id__ol_ggn_qfv_1dc" > < li class = "- topic/li li" data-ofbid = "d246117e336__20250121171701" >
< p class = "- topic/p p" data-ofbid = "d246117e338__20250121171701" > 升级前， ， < / p >
< / li > < li class = "- topic/li li" data-ofbid = "d246117e341__20250121171701" >
< p class = "- topic/p p" data-ofbid = "d246117e343__20250121171701" > 启动 OTA 升级，给 B 系统升级程序。< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d246117e346__20250121171701" >
< p class = "- topic/p p" data-ofbid = "d246117e348__20250121171701" > 升级完成后重启，从 B 系统启动， < / p >
< / li > < / ol >
< / section > < section class = "- topic/section section" id = "id__section_k5j_33v_1dc" data-ofbid = "id__section_k5j_33v_1dc" > < h2 class = "- topic/title title sectiontitle" > ENV 环境变量< / h2 >
< div class = "- topic/p p" data-ofbid = "d246117e357__20250121171701" > OTA 升级涉及的 ENV 环境变量描述如下：< ul class = "- topic/ul ul" id = "id__ul_gvj_p3v_1dc" data-ofbid = "id__ul_gvj_p3v_1dc" > < li class = "- topic/li li" data-ofbid = "d246117e360__20250121171701" > 环境变量文件路径：< span class = "+ topic/ph sw-d/filepath ph filepath" > target/xx-chip/xx-board/pack/env.txt< / span > < / li > < li class = "- topic/li li" data-ofbid = "d246117e364__20250121171701" > 环境变量文件详细内容：< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "id__codeblock_olb_r3v_1dc" data-ofbid = "id__codeblock_olb_r3v_1dc" > osAB_next=A
osAB_now=A
rodataAB_next=A
rodataAB_now=A
dataAB_next=A
dataAB_now=A
upgrade_available=< span class = "hl-number" > 0< / span >
bootlimit=< span class = "hl-number" > 5< / span >
bootcount=< span class = "hl-number" > 0< / span >
rodata_partname=blk_rodata
rodata_partname_r=blk_rodata_r
data_partname=blk_data
data_partname_r=blk_data_r< / pre > < / li > < / ul > < / div >
< div class = "table-container" > < table class = "- topic/table table docutils align-default frame-all" id = "id__table_jgn_qfv_1dc" data-ofbid = "id__table_jgn_qfv_1dc" data-cols = "3" > < 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" > 4< / span > < span class = "table--title-label-punctuation" > . < / span > < / span > < span class = "table--title" > 环境变量使用说明< / span > < / caption > < colgroup > < col style = "width:17.513134851138354%" / > < col style = "width:25.39404553415061%" / > < col style = "width:57.09281961471103%" / > < / colgroup > < thead class = "- topic/thead thead" > < tr class = "- topic/row row-odd" > < th class = "- topic/entry entry head colsep-1 rowsep-1" id = "id__table_jgn_qfv_1dc__entry__1" > 环境变量名称< / th > < th class = "- topic/entry entry head colsep-1 rowsep-1" id = "id__table_jgn_qfv_1dc__entry__2" > 定义< / th > < th class = "- topic/entry entry head colsep-0 rowsep-1" id = "id__table_jgn_qfv_1dc__entry__3" > 注释说明< / th > < / tr > < / thead > < tbody class = "- topic/tbody tbody" > < tr class = "- topic/row row-even" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_jgn_qfv_1dc__entry__1" > osAB_now< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_jgn_qfv_1dc__entry__2" > 当前启动分区< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_jgn_qfv_1dc__entry__3" > osAB_now 取值说明：< ul class = "- topic/ul ul" id = "id__ul_gbs_smv_1dc" data-ofbid = "id__ul_gbs_smv_1dc" > < li class = "- topic/li li" data-ofbid = "d246117e393__20250121171701" > “A”： < / li > < li class = "- topic/li li" data-ofbid = "d246117e395__20250121171701" > “B”： < / li > < / ul > < / td > < / tr > < tr class = "- topic/row row-odd" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_jgn_qfv_1dc__entry__1" > osAB_next< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_jgn_qfv_1dc__entry__2" > 下次启动分区< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_jgn_qfv_1dc__entry__3" > osAB_next 取值说明：< ul class = "- topic/ul ul" id = "id__ul_exs_vmv_1dc" data-ofbid = "id__ul_exs_vmv_1dc" > < li class = "- topic/li li" data-ofbid = "d246117e405__20250121171701" > “A”： < / li > < li class = "- topic/li li" data-ofbid = "d246117e407__20250121171701" > “B”： < / li > < / ul > < / td > < / tr > < tr class = "- topic/row row-even" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_jgn_qfv_1dc__entry__1" > rodataAB_now< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_jgn_qfv_1dc__entry__2" > 当前挂载的只读分区< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_jgn_qfv_1dc__entry__3" > rodataAB_now 取值说明：< ul class = "- topic/ul ul" id = "id__ul_bng_xmv_1dc" data-ofbid = "id__ul_bng_xmv_1dc" > < li class = "- topic/li li" data-ofbid = "d246117e417__20250121171701" > “A”： < / li > < li class = "- topic/li li" data-ofbid = "d246117e419__20250121171701" > “B”： < / li > < / ul > < / td > < / tr > < tr class = "- topic/row row-odd" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_jgn_qfv_1dc__entry__1" > rodataAB_next< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_jgn_qfv_1dc__entry__2" > 下次挂载的只读分区< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_jgn_qfv_1dc__entry__3" > rodataAB_next 取值说明：< ul class = "- topic/ul ul" id = "id__ul_avg_ymv_1dc" data-ofbid = "id__ul_avg_ymv_1dc" > < li class = "- topic/li li" data-ofbid = "d246117e429__20250121171701" > “A”： < / li > < li class = "- topic/li li" data-ofbid = "d246117e431__20250121171701" > “B”： < / li > < / ul > < / td > < / tr > < tr class = "- topic/row row-even" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_jgn_qfv_1dc__entry__1" > dataAB_now< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers
< figure class = "- topic/fig fig fignone" id = "id__fig_tzr_t3v_1dc" data-ofbid = "id__fig_tzr_t3v_1dc" > < br / > < div class = "imagecenter" > < img class = "- topic/image image imagecenter" id = "id__image_kgn_qfv_1dc" src = "../../../images/ota/env.png" alt = "env" / > < / div > < br / > < figcaption data-caption-side = "bottom" class = "- topic/title title figcapcenter" > < span class = "figtitleprefix fig--title-label" > 图< span class = "fig--title-label-number" > 3< / span > < span class = "fig--title-label-punctuation" > . < / span > < / span > < span class = "fig--title" > 环境变量在 OTA 升级过程中的作用< / span > < / figcaption > < / figure >
< div class = "- topic/note note note note_note" id = "id__note_azg_v3v_1dc" data-ofbid = "id__note_azg_v3v_1dc" > < span class = "note__title" > 注：< / span >
< p class = "- topic/p p" data-ofbid = "d246117e525__20250121171701" > rodata 和 data 分区的升级原理与 OS 相同。< / p >
< / div >
< / section > < section class = "- topic/section section" id = "id__section_bdt_x3v_1dc" data-ofbid = "id__section_bdt_x3v_1dc" > < h2 class = "- topic/title title sectiontitle" > OTA 升级包制作原理< / h2 >
< div class = "- topic/p p" data-ofbid = "d246117e534__20250121171701" > < strong class = "+ topic/ph hi-d/b ph b" > OTA 升级包配置文件< / strong > 为
< span class = "+ topic/ph sw-d/filepath ph filepath" > ota-subimgs.cfg< / span > ： < pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "id__codeblock_zzm_cjv_1dc" data-ofbid = "id__codeblock_zzm_cjv_1dc" > [image]
size = < span class = "hl-string" > ""< / span > ;
version = < span class = "hl-string" > "1.0.0"< / span > ;
[file]
ota_info.bin:file;
d21x_os.itb:os;
rodata.fatfs:rodata;
data.fatfs:blk_data;< / pre > < div class = "table-container" > < table class = "- topic/table table docutils align-default frame-all" id = "id__table_mgn_qfv_1dc" data-ofbid = "id__table_mgn_qfv_1dc" data-cols = "3" > < 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" > 5< / span > < span class = "table--title-label-punctuation" > . < / span > < / span > < span class = "table--title" > ota-subimgs.cfg 配置文件详细说明< / span > < / caption > < colgroup > < col style = "width:16.233766233766232%" / > < col style = "width:26.136363636363637%" / > < col style = "width:57.62987012987013%" / > < / colgroup > < thead class = "- topic/thead thead" > < tr class = "- topic/row row-odd" > < th class = "- topic/entry entry head colsep-1 rowsep-1" id = "id__table_mgn_qfv_1dc__entry__1" > 环境变量名称< / th > < th class = "- topic/entry entry head colsep-1 rowsep-1" id = "id__table_mgn_qfv_1dc__entry__2" > 定义< / th > < th class = "- topic/entry entry head colsep-0 rowsep-1" id = "id__table_mgn_qfv_1dc__entry__3" > 注释说明< / th > < / tr > < / thead > < tbody class = "- topic/tbody tbody" > < tr class = "- topic/row row-even" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_mgn_qfv_1dc__entry__1" > size< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_mgn_qfv_1dc__entry__2" > 整个 < span class = "+ topic/ph sw-d/filepath ph filepath" > ota.cpio< / span > 文件的大小< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_mgn_qfv_1dc__entry__3" > size 为 py 脚本自动计算，在 C 文件中有解析此字段，供用户用做下载进度等使用。< / td > < / tr > < tr class = "- topic/row row-odd" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_mgn_qfv_1dc__entry__1" > version< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_mgn_qfv_1dc__entry__2" > 新更新的系统版本号< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_mgn_qfv_1dc__entry__3" > version 为 py 脚本自动填充，从 < span class = "+ topic/ph sw-d/filepath ph filepath" > image_cfg.json< / span >
中解析，用户应修改 < span class = "+ topic/ph sw-d/filepath ph filepath" > image_cfg.json< / span > 中的版本号。< / td > < / tr > < tr class = "- topic/row row-even" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_mgn_qfv_1dc__entry__1" > ota_info.bin< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_mgn_qfv_1dc__entry__2" > ota-subimgs.cfg 的二进制文件< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_mgn_qfv_1dc__entry__3" > py 脚本会将本文件编译为二进制流文件，供 C 文件中解析使用。file 属性可以忽略。< / td > < / tr > < tr class = "- topic/row row-odd" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_mgn_qfv_1dc__entry__1" > d21x_os.itb< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_mgn_qfv_1dc__entry__2" > OS 的实际比特流文件< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_mgn_qfv_1dc__entry__3" > 此文件编译会自动生成，此处存在代表将会被打包进 cpio 包。 < span class = "+ topic/keyword pr-d/parmname keyword parmname" > os< / span >
为即将升级到的设备。< / td > < / tr > < tr class = "- topic/row row-even" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_mgn_qfv_1dc__entry__1" > rodata.fatfs< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "id__table_mgn_qfv_1dc__entry__2" > 只读分区的实际比特流文件< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "id__table_mgn_qfv_1dc__entry__3" > 此文件编译会自动生成，此处存在代表将会被打包进 cpio 包。 < span class = "+ topic/keyword pr-d/parmname keyword parmname" > rodata< / span >
为即将升级到的设备。< / td > < / tr > < tr class = "- topic/row row-odd" > < td class = "- topic/entry entry colsep-1 rowsep-0" headers = "id__table_mgn_qfv_1dc__entry__1" > data.fatfs< / td > < td class = "- topic/entry entry colsep-1 rowsep-0" headers = "id__table_mgn_qfv_1dc__entry__2" > 读写分区的实际比特流文件< / td > < td class = "- topic/entry entry colsep-0 rowsep-0" headers = "id__table_mgn_qfv_1dc__entry__3" > 此文件编译会自动生成，此处存在代表将会被打包进 cpio 包。 < span class = "+ topic/keyword pr-d/parmname keyword parmname" > blk_data< / span >
为即将升级到的设备。< / td > < / tr > < / tbody > < / table > < / div > < div class = "- topic/note note note note_note" id = "id__note_ep5_djv_1dc" data-ofbid = "id__note_ep5_djv_1dc" > < span class = "note__title" > 注：< / span >
< ol class = "- topic/ol ol arabic simple" id = "id__ol_ngn_qfv_1dc" data-ofbid = "id__ol_ngn_qfv_1dc" > < li class = "- topic/li li" data-ofbid = "d246117e622__20250121171701" >
< p class = "- topic/p p" data-ofbid = "d246117e624__20250121171701" > FLASH
为 NAND 时，只读文件系统与读写文件系统升级的设备不同，读写文件系统依赖 NFTL 支持，烧写
FLASH 需使用块设备接口，而只读文件系统烧写 FLASH 使用 MTD 设备接口即可。< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d246117e630__20250121171701" >
< p class = "- topic/p p" data-ofbid = "d246117e632__20250121171701" > FLASH 为 NOR 时，由于空间限制，目前读写文件系统不使用 OTA 进行升级。< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d246117e635__20250121171701" >
< p class = "- topic/p p" data-ofbid = "d246117e637__20250121171701" > FLASH 为 eMMC 时，主分区应为 < span class = "+ topic/keyword pr-d/parmname keyword parmname" > mmc0p*< / span > , 备份分区在
< span class = "+ topic/ph sw-d/filepath ph filepath" > image_cfg.json< / span > 分配时应该在主分区下面，在 OTA 代码中，默认将
< span class = "+ topic/keyword pr-d/parmname keyword parmname" > mmc0p*+1< / span > 作为备份分区。< / p >
< / li > < / ol >
< / div >
< / div >
< p class = "- topic/p p" data-ofbid = "d246117e652__20250121171701" > < strong class = "+ topic/ph hi-d/b ph b" > OTA 升级包生成工具< / strong > 为 < span class = "+ topic/ph sw-d/filepath ph filepath" > mkcpio.py< / span > ，文件路径为
< span class = "+ topic/ph sw-d/filepath ph filepath" > tools/scripts/mkcpio.py< / span > < / p >
< p class = "- topic/p p" data-ofbid = "d246117e662__20250121171701" > 执行编译命令，会自动执行 < span class = "+ topic/ph sw-d/filepath ph filepath" > mkcpio.py< / span > 命令生成 ota.cpio。mkcpio.py 具体调用了 cpio,
cpio.exe 命令进行打包。< / p >
< / section > < section class = "- topic/section section" id = "id__section_zsq_2jv_1dc" data-ofbid = "id__section_zsq_2jv_1dc" > < h2 class = "- topic/title title sectiontitle" > OTA 包数据组成格式< / h2 >
< div class = "- topic/p p" data-ofbid = "d246117e673__20250121171701" >
< figure class = "- topic/fig fig fignone" id = "id__fig_ig2_xjv_1dc" data-ofbid = "id__fig_ig2_xjv_1dc" > < br / > < div class = "imagecenter" > < img class = "- topic/image image imagecenter" id = "id__image_pgn_qfv_1dc" src = "../../../images/ota/cpio.png" width = "192" alt = "cpio" / > < / div > < br / > < figcaption data-caption-side = "bottom" class = "- topic/title title figcapcenter" > < span class = "figtitleprefix fig--title-label" > 图< span class = "fig--title-label-number" > 4< / span > < span class = "fig--title-label-punctuation" > . < / span > < / span > < span class = "fig--title" > OTA 包数据组成格式< / span > < / figcaption > < / figure >
< / div >
< div class = "- topic/p p" data-ofbid = "d246117e683__20250121171701" > 其中头部信息如下：< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "id__codeblock_drv_yjv_1dc" data-ofbid = "id__codeblock_drv_yjv_1dc" > < strong class = "hl-keyword" > struct< / strong > filehdr {
< strong class = "hl-keyword" > unsigned< / strong > < strong class = "hl-keyword" > int< / strong > format;
< strong class = "hl-keyword" > unsigned< / strong > < strong class = "hl-keyword" > int< / strong > size;
< strong class = "hl-keyword" > unsigned< / strong > < strong class = "hl-keyword" > int< / strong > size_align;
< strong class = "hl-keyword" > unsigned< / strong > < strong class = "hl-keyword" > int< / strong > begin_offset;
< strong class = "hl-keyword" > unsigned< / strong > < strong class = "hl-keyword" > int< / strong > cpio_header_len;
< strong class = "hl-keyword" > unsigned< / strong > < strong class = "hl-keyword" > int< / strong > namesize;
< strong class = "hl-keyword" > unsigned< / strong > < strong class = "hl-keyword" > int< / strong > filename_size;
< strong class = "hl-keyword" > unsigned< / strong > < strong class = "hl-keyword" > int< / strong > filename_align;
< strong class = "hl-keyword" > unsigned< / strong > < strong class = "hl-keyword" > int< / strong > burn_len;
< strong class = "hl-keyword" > unsigned< / strong > < strong class = "hl-keyword" > int< / strong > chksum;
< strong class = "hl-keyword" > unsigned< / strong > < strong class = "hl-keyword" > int< / strong > sum;
< strong class = "hl-keyword" > char< / strong > filename[MAX_IMAGE_FNAME];
};< / pre > < / div >
< / section > < section class = "- topic/section section" id = "id__section_tjc_vgv_1dc" data-ofbid = "id__section_tjc_vgv_1dc" > < h2 class = "- topic/title title sectiontitle" > A/B 系统分区优势< / h2 >
< ol class = "- topic/ol ol arabic simple" id = "id__ol_fcr_gfq_wcc" data-ofbid = "id__ol_fcr_gfq_wcc" > < li class = "- topic/li li" data-ofbid = "d246117e694__20250121171701" >
< p class = "- topic/p p" data-ofbid = "d246117e696__20250121171701" > 避免出现升级过程中意外断电导致系统更新失败且重启后不能继续升级的问题。< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d246117e699__20250121171701" >
< p class = "- topic/p p" data-ofbid = "d246117e701__20250121171701" > 自带回滚机制，可以恢复到原来的程序。< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d246117e708__20250121171701" >
< p class = "- topic/p p" data-ofbid = "d246117e710__20250121171701" > 对比 Recovery 系统方案，配置简单，维护方便。< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d246117e713__20250121171701" >
< p class = "- topic/p p" data-ofbid = "d246117e715__20250121171701" > 消耗的存储资源相对较少，现有平台存储资源完全能满足要求。< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d246117e718__20250121171701" >
< p class = "- topic/p p" data-ofbid = "d246117e720__20250121171701" > 在 RTOS 系统上获取、校验和升级固件，不涉及 Boot， < / p >
< / li > < li class = "- topic/li li" data-ofbid = "d246117e723__20250121171701" >
< p class = "- topic/p p" data-ofbid = "d246117e725__20250121171701" > 市面上的应用广泛。< / p >
< / li > < / ol >
< / section > < section class = "- topic/section section" id = "id__section_lvr_j1q_wcc" data-ofbid = "id__section_lvr_j1q_wcc" > < h2 class = "- topic/title title sectiontitle" > 网络 OTA 流程< / h2 >
< ul class = "- topic/ul ul" id = "id__ul_vts_2v5_4dc" data-ofbid = "id__ul_vts_2v5_4dc" > < li class = "- topic/li li" data-ofbid = "d246117e735__20250121171701" >
< div class = "- topic/div div" >
< p class = "- topic/p p" data-ofbid = "d246117e739__20250121171701" > < strong class = "+ topic/ph hi-d/b ph b" > OS 阶段 app OTA 执行流程< / strong > < / p >
< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "id__codeblock_p4q_wgq_wcc" data-ofbid = "id__codeblock_p4q_wgq_wcc" > http_ota < em class = "hl-comment" > //packages/third-party/ota_downloader/src/http_ota.c< / em >
|-> http_ota_fw_download(argv[< span class = "hl-number" > 1< / span > ]);
|-> webclient_session_create(GET_HEADER_BUFSZ);
|-> webclient_shard_head_function(session, uri, & file_size);
|-> webclient_register_shard_position_function(session, http_ota_shard_download_swu_handle);
|-> webclient_shard_position_function(session, uri, file_offset, file_size, HTTP_OTA_BUFF_LEN);
|-> http_ota_shard_download_swu_handle < em class = "hl-comment" > //采用分片方式下载数据< / em >
|-> ota_buf_push(& shdr, buffer, length); < em class = "hl-comment" > //将下载的数据放到缓存区，供解析 cpio 头部信息< / em >
|-> find_cpio_data(& fhdr, shdr.buf, shdr.buflen); < em class = "hl-comment" > //解析 cpio 头部信息< / em >
|-> parse_cpio_file_info(& bhdr, & fhdr, & finfo); < em class = "hl-comment" > //解析 cpio 文件大小和版本号，供用户自定义使用，并且存储烧录的分区设备名字< / em >
|-> swu_buf_pop(& bhdr, & shdr, & fhdr); < em class = "hl-comment" > //将 cpio 头部信息后面的数据放到另外的缓存区，供升级使用< / em >
|-> ota_buf_push(& bhdr, buffer, length); < em class = "hl-comment" > //将下载的数据放到缓存区，供升级使用< / em >
|-> find_device(partname) < em class = "hl-comment" > //获取分区信息< / em >
|-> aic_ota_erase_part(dl_part, < span class = "hl-number" > 0< / span > , dl_part-> len) < em class = "hl-comment" > //擦除分区< / em >
|-> download_buf_pop(& bhdr, & fhdr) < em class = "hl-comment" > //将缓存区里面的数据取出来，升级到 FLASH 上< / em >
|-> aic_ota_part_write < em class = "hl-comment" > //写入数据到 FLASH 上< / em >
|-> cpio_file_checksum((< strong class = "hl-keyword" > unsigned< / strong > < strong class = "hl-keyword" > char< / strong > *)bhdr-> buf, burn_len); < em class = "hl-comment" > //升级完成以后，校验和信息< / em >
|-> aic_upgrade_end(); < em class = "hl-comment" > //升级结束，更新环境变量信息< / em >
|-> rt_hw_cpu_reset(); < em class = "hl-comment" > //重新启动< / em > < / pre >
< / div >
< / li > < li class = "- topic/li li" data-ofbid = "d246117e747__20250121171701" >
< div class = "- topic/div div section" id = "id__boot" >
< p class = "- topic/p p" data-ofbid = "d246117e751__20250121171701" > < strong class = "+ topic/ph hi-d/b ph b" > Boot 阶段新系统程序加载启动流程< / strong > < / p >
< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "id__codeblock_iy2_lkv_1dc" data-ofbid = "id__codeblock_iy2_lkv_1dc" > do_nor_boot < em class = "hl-comment" > //application/baremetal/bootloader/cmd/nor_boot.c< / em >
|-> aic_ota_check(); < em class = "hl-comment" > //application/baremetal/bootloader/lib/absystem/absystem.c< / em >
|-> aic_ota_version_fallback(); < em class = "hl-comment" > // OTA 升级失败，版本回退到之前的版本< / em >
|-> aic_get_os_to_startup(target); < em class = "hl-comment" > //获取新系统信息< / em >
|-> find_boot_part(target); < em class = "hl-comment" > // 获取新系统 OS 分区结构体< / em >
|-> spl_load_simple_fit(& info, & entry_point); < em class = "hl-comment" > // 加载 os 分区程序到缓存上< / em > < / pre >
< / div >
< / li > < li class = "- topic/li li" data-ofbid = "d246117e759__20250121171701" >
< div class = "- topic/div div section" id = "id__os-app" >
< p class = "- topic/p p" data-ofbid = "d246117e763__20250121171701" > < strong class = "+ topic/ph hi-d/b ph b" > OS 阶段 app 挂载新文件系统< / strong >
< / p >
< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "id__codeblock_dm3_lkv_1dc" data-ofbid = "id__codeblock_dm3_lkv_1dc" > absystem.c < em class = "hl-comment" > //packages/artinchip/ota/absystem.c< / em >
|-> INIT_ENV_EXPORT(aic_absystem_mount_fs_prio0);
|-> INIT_LATE_APP_EXPORT(aic_absystem_mount_fs_prio1);< / pre >
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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_jvr_j1q_wcc" data-tocid = "id__section_jvr_j1q_wcc" > OTA 文件结构< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#id__section_zfn_qfv_1dc" data-tocid = "id__section_zfn_qfv_1dc" > A/B 系统分区信息< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#id__section_i4m_hjv_1dc" data-tocid = "id__section_i4m_hjv_1dc" > OTA 分区说明< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#id__section_fk4_shv_1dc" data-tocid = "id__section_fk4_shv_1dc" > A/B 系统升级过程< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#id__section_k5j_33v_1dc" data-tocid = "id__section_k5j_33v_1dc" > ENV 环境变量< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#id__section_bdt_x3v_1dc" data-tocid = "id__section_bdt_x3v_1dc" > OTA 升级包制作原理< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#id__section_zsq_2jv_1dc" data-tocid = "id__section_zsq_2jv_1dc" > OTA 包数据组成格式< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#id__section_tjc_vgv_1dc" data-tocid = "id__section_tjc_vgv_1dc" > A/B 系统分区优势< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#id__section_lvr_j1q_wcc" data-tocid = "id__section_lvr_j1q_wcc" > 网络 OTA 流程< / a > < / div > < / li > < / ul > < / div >
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