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Read time: 4 minute(s)
< / 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， < / 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
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
< em class = "hl-comment" > /* Use priorty 0 to override other SPI device when this device is enabled. */< / em >
SPL_LOAD_IMAGE_METHOD(< span class = "hl-string" > "SPINAND_UBI"< / span > , < span class = "hl-number" > 0< / span > , BOOT_DEVICE_SPI, spl_ubi_load_image);
#< strong class = "hl-keyword" > else< / strong >
SPL_LOAD_IMAGE_METHOD(< span class = "hl-string" > "SPINAND"< / span > , < span class = "hl-number" > 0< / span > , BOOT_DEVICE_SPI, spl_spi_nand_load_image);
#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 >
< 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" >
< 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 >
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_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 >
|-> boot_from_devices(spl_boot_list)
|-> spl_ll_find_loader() < em class = "hl-comment" > // 根据 device 找到 spl_load_image 指针< / em >
< em class = "hl-comment" > // 这里可能是各种介质的 load image 函数< / em >
< em class = "hl-comment" > // SPL_LOAD_IMAGE_METHOD() 定义的 Loader< / em >
< em class = "hl-comment" > // 可能是 MMC/SPI/BROM/...< / em > < / pre > < / div >
< / li > < li class = "- topic/li li" data-ofbid = "d303672e46__20250121171809" >
< 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 >
< 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 >
|-> spl_ll_find_loader() < em class = "hl-comment" > // 根据 device 找到 spl_load_image 指针< / em >
| < em class = "hl-comment" > // 此处通过遍历固件的 .u_boot_list_2_spl_image_loader_* 段< / em >
| < em class = "hl-comment" > // 找到当前使能的存储介质驱动，然后逐个尝试< / em >
|
|-> spl_load_image(loader);
|-> loader-> load_image(spl_image, & bootdev);
spl_spi_nand_load_image(); < em class = "hl-comment" > // arch/arm/mach-artinchip/spl_spi_nand.c< / em >
|-> spl_spi_nand_init();
| |-> uclass_first_device(UCLASS_MTD, & dev); < em class = "hl-comment" > // drivers/core/uclass.c< / em >
| |-> mtd_probe(dev);
| |-> get_mtd_device(NULL, < span class = "hl-number" > 0< / span > );
|-> spl_get_load_buffer(-< strong class = "hl-keyword" > sizeof< / strong > (*header), < strong class = "hl-keyword" > sizeof< / strong > (*header));
|-> spl_spi_nand_read();
| < em class = "hl-comment" > // 读取头信息< / em >
|-> spl_parse_image_header(spl_image, header);
|-> spl_spi_nand_read();< em class = "hl-comment" > // arch/arm/mach-artinchip/spl_spi_nand.c< / em >
| < em class = "hl-comment" > // 读取整个 U-Boot 镜像< / em >
|-> mtd_block_isbad(mtd, off);
| < em class = "hl-comment" > // 跳过坏块< / em >
|-> mtd_read(); < em class = "hl-comment" > // drivers/mtd/mtdcore.c< / em > < / pre > < / div >
< / li > < / ol >
< / 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 >
< 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 >
|-> boot_from_devices(spl_boot_list)
|-> spl_ll_find_loader() < em class = "hl-comment" > // 根据 device 找到 spl_load_image 指针< / em >
< em class = "hl-comment" > // 这里可能是各种介质的 load image 函数< / em >
< em class = "hl-comment" > // SPL_LOAD_IMAGE_METHOD() 定义的 Loader< / em >
< em class = "hl-comment" > // 可能是 MMC/SPI/BROM/...< / em > < / pre > < / div >
< / li > < li class = "- topic/li li" data-ofbid = "d303672e73__20250121171809" >
< 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" >
< p class = "- topic/p p" data-ofbid = "d303672e80__20250121171809" > CONFIG_SPL_UBI_INFO_ADDR< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d303672e83__20250121171809" >
< p class = "- topic/p p" data-ofbid = "d303672e85__20250121171809" > CONFIG_SPL_UBI_PEB_OFFSET< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d303672e88__20250121171809" >
< p class = "- topic/p p" data-ofbid = "d303672e90__20250121171809" > CONFIG_SPL_UBI_VID_OFFSET< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d303672e93__20250121171809" >
< p class = "- topic/p p" data-ofbid = "d303672e95__20250121171809" > CONFIG_SPL_UBI_LEB_START< / p >
< / li > < / ul > < / div >
< p class = "- topic/p p" data-ofbid = "d303672e99__20250121171809" > 或者从指定 Volume 中读取< / p >
< 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 >
|-> spl_ll_find_loader() < em class = "hl-comment" > // 根据 device 找到 spl_load_image 指针< / em >
| < em class = "hl-comment" > // 此处通过遍历固件的 .u_boot_list_2_spl_image_loader_* 段< / em >
| < em class = "hl-comment" > // 找到当前支持的存储介质，然后逐个尝试< / em >
|
|-> spl_load_image(loader);
|-> loader-> load_image(spl_image, & bootdev);
spl_ubi_load_image(); < em class = "hl-comment" > // arch/arm/mach-artinchip/spl_spi_nand.c< / em >
|-> spl_spi_nand_init();
| |-> uclass_first_device(UCLASS_MTD, & dev); < em class = "hl-comment" > // drivers/core/uclass.c< / em >
| |-> mtd_probe(dev);
| |-> get_mtd_device(NULL, < span class = "hl-number" > 0< / span > );
|-> 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 >
| | < em class = "hl-comment" > // 读取整个 U-Boot 镜像的内容< / em >
| |-> ipl_scan(ubi);
| |-> ipl_load(ubi, lv-> vol_id, lv-> load_addr);
| | < em class = "hl-comment" > // drivers/mtd/ubispl/ubispl.c< / em >
| |-> ubi_load_block(ubi, laddr, vi, vol_id, lnum, last);
| |-> ubi_io_is_bad(ubi, pnum); < em class = "hl-comment" > // drivers/mtd/ubi/io.c< / em >
| | < em class = "hl-comment" > // drivers/mtd/ubispl/ubispl.c< / em >
| |-> ubi_io_read(ubi, laddr, pnum, ubi-> leb_start, dlen);
| | < em class = "hl-comment" > // drivers/mtd/ubispl/ubispl.c< / em >
| |-> ubi-> read(pnum + ubi-> peb_offset, from, len, buf);
| nand_spl_read_block(pnum + ubi-> peb_offset,
| | from, len, buf);
| | < em class = "hl-comment" > // arch/arm/mach-artinchip/spl_spi_nand.c< / em >
| |-> mtd_read();
|
|-> 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);
part_read_oob(mtd, from, ops); < em class = "hl-comment" > // drivers/mtd/mtdpart.c< / em >
spinand_mtd_read(mtd, from, & ops); < em class = "hl-comment" > // drivers/mtd/nand/spi/core.c< / em >
|-> spinand_read_page(spinand, & iter.req, enable_ecc);
|-> spinand_load_page_op(spinand, req);
| |-> spi_mem_exec_op(spinand-> slave, & op);
| | < em class = "hl-comment" > // drivers/spi/spi-mem-nodm.c< / em >
| |-> spi_xfer(slave, op_len * < span class = "hl-number" > 8< / span > , op_buf, NULL, flag);
|
|-> spinand_read_from_cache_op(spinand, req);
|-> spi_mem_exec_op(spinand-> slave, & op);
|-> spi_xfer(slave, op_len * < span class = "hl-number" > 8< / span > , op_buf, NULL, flag);< / pre >
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