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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic concept/concept topic concept" role="article" aria-labelledby="ariaid-title1"><span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/boot/load-spiNand.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">SPI NAND 加载</h1><div class="date inPage">25 Dec 2024</div><div style="color: gray;">
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Read time: 4 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><p class="- topic/p p" data-ofbid="d303672e22__20250121171809">官方版本的 SPL 并不支持从 SPI NAND 启动，ArtInChip 增加了从 SPI NAND 的 MTD 分区 和 UBI 加载 U-Boot 的支持。</p><div class="- topic/p p" data-ofbid="d303672e24__20250121171809"><span class="+ topic/ph sw-d/filepath ph filepath">common/spl/spl_spi_nand.c</span> 中注册了两个不同的 SPL
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程序加载器。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="concept_nsb_pj3_pzb__codeblock_t5d_spy_c1c" data-ofbid="concept_nsb_pj3_pzb__codeblock_t5d_spy_c1c">#ifdef CONFIG_SPL_UBI
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<em class="hl-comment">/* Use priorty 0 to override other SPI device when this device is enabled. */</em>
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SPL_LOAD_IMAGE_METHOD(<span class="hl-string">"SPINAND_UBI"</span>, <span class="hl-number">0</span>, BOOT_DEVICE_SPI, spl_ubi_load_image);
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#<strong class="hl-keyword">else</strong>
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SPL_LOAD_IMAGE_METHOD(<span class="hl-string">"SPINAND"</span>, <span class="hl-number">0</span>, BOOT_DEVICE_SPI, spl_spi_nand_load_image);
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#endif</pre></div><section class="- topic/section section" id="concept_nsb_pj3_pzb__section_unf_s1h_bzb" data-ofbid="concept_nsb_pj3_pzb__section_unf_s1h_bzb"><h2 class="- topic/title title sectiontitle">U-Boot 保存在 MTD 分区</h2>
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<ol class="- topic/ol ol" id="concept_nsb_pj3_pzb__ol_knj_hcx_5dc" data-ofbid="concept_nsb_pj3_pzb__ol_knj_hcx_5dc"><li class="- topic/li li" data-ofbid="d303672e36__20250121171809">
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<div class="- topic/p p" data-ofbid="d303672e38__20250121171809">在 SPL 初始化过程中，通过 <span class="+ topic/keyword pr-d/apiname keyword apiname">boot_from_devices(spl_boot_list)</span>
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函数调用，检查当前项目 所支持的 SPL
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读取的存储介质类型，然后依次检查是否存在对应的程序加载器。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="concept_nsb_pj3_pzb__codeblock_nnj_spy_c1c" data-ofbid="concept_nsb_pj3_pzb__codeblock_nnj_spy_c1c">board_init_r() <em class="hl-comment">// common/spl/spl.c</em>
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|-> boot_from_devices(spl_boot_list)
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|-> spl_ll_find_loader() <em class="hl-comment">// 根据 device 找到 spl_load_image 指针</em>
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<em class="hl-comment">// 这里可能是各种介质的 load image 函数</em>
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<em class="hl-comment">// SPL_LOAD_IMAGE_METHOD() 定义的 Loader</em>
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<em class="hl-comment">// 可能是 MMC/SPI/BROM/...</em></pre></div>
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</li><li class="- topic/li li" data-ofbid="d303672e46__20250121171809">
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<p class="- topic/p p" data-ofbid="d303672e48__20250121171809">找到 SPL SPINAND Loader 之后，从项目配置的指定位置读取数据。</p>
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<div class="- topic/p p" data-ofbid="d303672e51__20250121171809">CONFIG_SYS_SPI_NAND_U_BOOT_OFFS<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="concept_nsb_pj3_pzb__codeblock_c3j_gsy_c1c" data-ofbid="concept_nsb_pj3_pzb__codeblock_c3j_gsy_c1c">boot_from_devices(spl_boot_list); <em class="hl-comment">// common/spl/spl.c</em>
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|-> spl_ll_find_loader() <em class="hl-comment">// 根据 device 找到 spl_load_image 指针</em>
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| <em class="hl-comment">// 此处通过遍历固件的 .u_boot_list_2_spl_image_loader_* 段</em>
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| <em class="hl-comment">// 找到当前使能的存储介质驱动，然后逐个尝试</em>
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|
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|-> spl_load_image(loader);
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|-> loader->load_image(spl_image, &bootdev);
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spl_spi_nand_load_image(); <em class="hl-comment">// arch/arm/mach-artinchip/spl_spi_nand.c</em>
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|-> spl_spi_nand_init();
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| |-> uclass_first_device(UCLASS_MTD, &dev); <em class="hl-comment">// drivers/core/uclass.c</em>
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| |-> mtd_probe(dev);
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| |-> get_mtd_device(NULL, <span class="hl-number">0</span>);
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|-> spl_get_load_buffer(-<strong class="hl-keyword">sizeof</strong>(*header), <strong class="hl-keyword">sizeof</strong>(*header));
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|-> spl_spi_nand_read();
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| <em class="hl-comment">// 读取头信息</em>
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|-> spl_parse_image_header(spl_image, header);
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|-> spl_spi_nand_read();<em class="hl-comment">// arch/arm/mach-artinchip/spl_spi_nand.c</em>
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| <em class="hl-comment">// 读取整个 U-Boot 镜像</em>
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|-> mtd_block_isbad(mtd, off);
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| <em class="hl-comment">// 跳过坏块</em>
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|-> mtd_read(); <em class="hl-comment">// drivers/mtd/mtdcore.c</em></pre></div>
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</li></ol>
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</section><section class="- topic/section section" id="concept_nsb_pj3_pzb__section_ynf_s1h_bzb" data-ofbid="concept_nsb_pj3_pzb__section_ynf_s1h_bzb"><h2 class="- topic/title title sectiontitle">U-Boot 保存在 UBI 中</h2>
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<ol class="- topic/ol ol" id="concept_nsb_pj3_pzb__ol_kbd_jcx_5dc" data-ofbid="concept_nsb_pj3_pzb__ol_kbd_jcx_5dc"><li class="- topic/li li" data-ofbid="d303672e63__20250121171809">
|
||
<div class="- topic/p p" data-ofbid="d303672e65__20250121171809">在 SPL 初始化过程中，通过 <span class="+ topic/keyword pr-d/apiname keyword apiname">boot_from_devices(spl_boot_list)</span>
|
||
函数调用，检查当前项目 所支持的 SPL
|
||
读取的存储介质类型，然后依次检查是否存在对应的程序加载器。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="concept_nsb_pj3_pzb__codeblock_u4x_gsy_c1c" data-ofbid="concept_nsb_pj3_pzb__codeblock_u4x_gsy_c1c">board_init_r() <em class="hl-comment">// common/spl/spl.c</em>
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|-> boot_from_devices(spl_boot_list)
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|-> spl_ll_find_loader() <em class="hl-comment">// 根据 device 找到 spl_load_image 指针</em>
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<em class="hl-comment">// 这里可能是各种介质的 load image 函数</em>
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||
<em class="hl-comment">// SPL_LOAD_IMAGE_METHOD() 定义的 Loader</em>
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<em class="hl-comment">// 可能是 MMC/SPI/BROM/...</em></pre></div>
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</li><li class="- topic/li li" data-ofbid="d303672e73__20250121171809">
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||
<div class="- topic/p p" data-ofbid="d303672e75__20250121171809">找到 SPL SPINAND UBI Loader 之后，从项目配置的指定位置读取数据。<ul class="- topic/ul ul" id="concept_nsb_pj3_pzb__ul_a4f_s1h_bzb" data-ofbid="concept_nsb_pj3_pzb__ul_a4f_s1h_bzb"><li class="- topic/li li" data-ofbid="d303672e78__20250121171809">
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<p class="- topic/p p" data-ofbid="d303672e80__20250121171809">CONFIG_SPL_UBI_INFO_ADDR</p>
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</li><li class="- topic/li li" data-ofbid="d303672e83__20250121171809">
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<p class="- topic/p p" data-ofbid="d303672e85__20250121171809">CONFIG_SPL_UBI_PEB_OFFSET</p>
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||
</li><li class="- topic/li li" data-ofbid="d303672e88__20250121171809">
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<p class="- topic/p p" data-ofbid="d303672e90__20250121171809">CONFIG_SPL_UBI_VID_OFFSET</p>
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||
</li><li class="- topic/li li" data-ofbid="d303672e93__20250121171809">
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<p class="- topic/p p" data-ofbid="d303672e95__20250121171809">CONFIG_SPL_UBI_LEB_START</p>
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</li></ul></div>
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<p class="- topic/p p" data-ofbid="d303672e99__20250121171809">或者从指定 Volume 中读取</p>
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<div class="- topic/p p" data-ofbid="d303672e102__20250121171809">CONFIG_SPL_UBI_LOAD_MONITOR_VOLNAME<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="concept_nsb_pj3_pzb__codeblock_ktp_hsy_c1c" data-ofbid="concept_nsb_pj3_pzb__codeblock_ktp_hsy_c1c">boot_from_devices(spl_boot_list); <em class="hl-comment">// common/spl/spl.c</em>
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|-> spl_ll_find_loader() <em class="hl-comment">// 根据 device 找到 spl_load_image 指针</em>
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| <em class="hl-comment">// 此处通过遍历固件的 .u_boot_list_2_spl_image_loader_* 段</em>
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| <em class="hl-comment">// 找到当前支持的存储介质，然后逐个尝试</em>
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|
|
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|-> spl_load_image(loader);
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|-> loader->load_image(spl_image, &bootdev);
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spl_ubi_load_image(); <em class="hl-comment">// arch/arm/mach-artinchip/spl_spi_nand.c</em>
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|-> spl_spi_nand_init();
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| |-> uclass_first_device(UCLASS_MTD, &dev); <em class="hl-comment">// drivers/core/uclass.c</em>
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| |-> mtd_probe(dev);
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| |-> get_mtd_device(NULL, <span class="hl-number">0</span>);
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||
|-> spl_get_load_buffer(-<strong class="hl-keyword">sizeof</strong>(*header), <strong class="hl-keyword">sizeof</strong>(*header));
|
||
|-> ubispl_load_volumes(&info, volumes, <span class="hl-number">1</span>); <em class="hl-comment">// drivers/mtd/ubispl/ubispl.c</em>
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| | <em class="hl-comment">// 读取整个 U-Boot 镜像的内容</em>
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||
| |-> ipl_scan(ubi);
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||
| |-> ipl_load(ubi, lv->vol_id, lv->load_addr);
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||
| | <em class="hl-comment">// drivers/mtd/ubispl/ubispl.c</em>
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||
| |-> ubi_load_block(ubi, laddr, vi, vol_id, lnum, last);
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||
| |-> ubi_io_is_bad(ubi, pnum); <em class="hl-comment">// drivers/mtd/ubi/io.c</em>
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| | <em class="hl-comment">// drivers/mtd/ubispl/ubispl.c</em>
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||
| |-> ubi_io_read(ubi, laddr, pnum, ubi->leb_start, dlen);
|
||
| | <em class="hl-comment">// drivers/mtd/ubispl/ubispl.c</em>
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||
| |-> ubi->read(pnum + ubi->peb_offset, from, len, buf);
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| nand_spl_read_block(pnum + ubi->peb_offset,
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| | from, len, buf);
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| | <em class="hl-comment">// arch/arm/mach-artinchip/spl_spi_nand.c</em>
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| |-> mtd_read();
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|
|
||
|-> spl_parse_image_header(spl_image, header);</pre></div>
|
||
</li></ol>
|
||
</section><section class="- topic/section section" id="concept_nsb_pj3_pzb__section_ogg_t1h_bzb" data-ofbid="concept_nsb_pj3_pzb__section_ogg_t1h_bzb"><h2 class="- topic/title title sectiontitle">读数 SPI NAND 数据的流程</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d303672e113__20250121171809">
|
||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="concept_nsb_pj3_pzb__codeblock_kkh_3sy_c1c" data-ofbid="concept_nsb_pj3_pzb__codeblock_kkh_3sy_c1c">mtd_read(); <em class="hl-comment">// drivers/mtd/mtdcore.c</em>
|
||
|-> mtd->_read_oob(mtd, from, &ops);
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part_read_oob(mtd, from, ops); <em class="hl-comment">// drivers/mtd/mtdpart.c</em>
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spinand_mtd_read(mtd, from, &ops); <em class="hl-comment">// drivers/mtd/nand/spi/core.c</em>
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||
|-> spinand_read_page(spinand, &iter.req, enable_ecc);
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|-> spinand_load_page_op(spinand, req);
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||
| |-> spi_mem_exec_op(spinand->slave, &op);
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||
| | <em class="hl-comment">// drivers/spi/spi-mem-nodm.c</em>
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||
| |-> spi_xfer(slave, op_len * <span class="hl-number">8</span>, op_buf, NULL, flag);
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||
|
|
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|-> spinand_read_from_cache_op(spinand, req);
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|-> spi_mem_exec_op(spinand->slave, &op);
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||
|-> spi_xfer(slave, op_len * <span class="hl-number">8</span>, op_buf, NULL, flag);</pre>
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</div>
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</section></div></article></main></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="#concept_nsb_pj3_pzb__section_unf_s1h_bzb" data-tocid="concept_nsb_pj3_pzb__section_unf_s1h_bzb">U-Boot 保存在 MTD 分区</a></div></li><li class="section-item"><div class="section-title"><a href="#concept_nsb_pj3_pzb__section_ynf_s1h_bzb" data-tocid="concept_nsb_pj3_pzb__section_ynf_s1h_bzb">U-Boot 保存在 UBI 中</a></div></li><li class="section-item"><div class="section-title"><a href="#concept_nsb_pj3_pzb__section_ogg_t1h_bzb" data-tocid="concept_nsb_pj3_pzb__section_ogg_t1h_bzb">读数 SPI NAND 数据的流程</a></div></li></ul></div>
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