OK6410A development board (three) 8 u-boot-2021.01 boot analysis SPL image running part

url : git@github.com:lisider/u-boot.git

branch : ok6410a

commit id : e63a4077ad3aea53107495b0b68b95e720fe6033

config : ok6410a_mini_defconfig

// There are 67 .S .s .c files involved

From the entrance to the exit

// Run at 0x0c00 0000

reset arch/arm/cpu/arm1176/start.S 39

lowlevel_init(108) board/samsung/ok6410a/lowlevel_init.S 72

_main(110) arch/arm/lib/crt0.S 91

board_init_f(117) board/samsung/ok6410a/ok6410a.c 266

debug_uart_init(271) include/debug_uart.h 193

_debug_uart_init(196) drivers/serial/s3c64xx_serial.c 315

board_init_r(177) common/spl/spl.c 589

spl_board_init(641) board/samsung/ok6410a/ok6410a.c 255

spl_boot_mmc(258) board/samsung/ok6410a/bl2_mmc_copy.c 18

mmc_bl2_copy(23) board/samsung/ok6410a/bl2_mmc_copy.c 7

CopyMovitoMem(HSMMC_CHANNEL, MOVI_BL2_POS, MOVI_BL2_BLKCNT, bl2_base, MOVI_INIT_REQUIRED)(13) arch/arm/mach-s3c64xx/include/mach/movi.h 25

bl2base(24) // Jump to u-boot image of u-boot

SPL standard process

reset arch/arm/cpu/arm1176/start.S 39

lowlevel_init(108) board/samsung/ok6410a/lowlevel_init.S 72

_main(110) arch/arm/lib/crt0.S 91

board_init_f(117) board/samsung/ok6410a/ok6410a.c 266

debug_uart_init(271) include/debug_uart.h 193

_debug_uart_init(196) drivers/serial/s3c64xx_serial.c 315

board_init_r(177) common/spl/spl.c 589

spl_board_init(641) board/samsung/ok6410a/ok6410a.c 255

memset(&spl_image, '', sizeof(spl_image)); // u-boot.img

spl_image.boot_device = 0xdeadbeef;

// Get the device type of u-boot.img

board_boot_order(spl_boot_list);

spl_boot_list[0] = spl_boot_device();

ok6410a_get_boot_device

// Get the loader function by device type

// Use loader function to load u-boot.img to ddr

boot_from_devices(&spl_image, spl_boot_list, (sizeof(spl_boot_list) / sizeof((spl_boot_list)[0])));

loader = spl_ll_find_loader(spl_boot_list[i]);

spl_load_image(spl_image, loader);

loader->load_image/spl_mmc_load_image

spl_mmc_load

...

spl_parse_image_header

spl_parse_legacy_header

spl_image->load_addr = image_get_load(header);

spl_image->entry_point = image_get_ep(header);

spl_image->size = image_get_data_size(header);

// If you need to patch, patch it quickly 

// For example, if there is a problem with your u-boot.img, the parsed entry_point is incorrect

//You need to reassign entry_point

// Usually null

spl_perform_fixups(&spl_image);

switch (spl_image.os) {

case IH_OS_U_BOOT:

break;

}

// Usually null

spl_board_prepare_for_boot

jump_to_image_no_args(&spl_image);

image_entry_noargs_t image_entry = (image_entry_noargs_t)spl_image->entry_point;

image_entry