Hi,expert:
In the EMMC boot mode, the custom TDA4 board will have more than 600 mA of current when it is powered on immediately after the power is removed. At this time, the system cannot be started and there is no information output from the serial port. It takes about 3 minutes to start normally. Is there any way to troubleshoot this?
Sometimes the serial port will output the following error message:
U-Boot SPL 2021.01-dirty (Jan 12 2022 - 17:14:56 +0800)
Model: Texas Instruments K3 J721E SoC
EEPROM not available at 0x50, trying to read at 0x51
Reading on-board EEPROM at 0x51 failed 1
Board: J721EX-PM1-SOM rev E2
SYSFW ABI: 3.1 (firmware rev 0x0015 '21.5.0--v2021.05 (Terrific Llam')
EEPROM not available at 0x50, trying to read at 0x51
Reading on-board EEPROM at 0x51 failed 1
Trying to boot from MMC1
mmc_load_image_raw_sector: mmc block read error
** Partition 1 not valid on device 0 **
spl_register_fat_device: fat register err - -1
spl_load_image_fat: error reading image tispl.bin, err - -1
spl: no partition table found
SPL: failed to boot from all boot devices
### ERROR ### Please RESET the board ###
The code for the error message appears in uboot spl_mmc.c:
int mmc_load_image_raw_sector(struct spl_image_info *spl_image,
struct mmc *mmc, unsigned long sector)
{
unsigned long count;
struct image_header *header;
struct blk_desc *bd = mmc_get_blk_desc(mmc);
int ret = 0;
header = spl_get_load_buffer(-sizeof(*header), bd->blksz);
/* read image header to find the image size & load address */
count = blk_dread(bd, sector, 1, header);
debug("hdr read sector %lx, count=%lu\n", sector, count);
if (count == 0) {
ret = -EIO;
goto end;
}
if (IS_ENABLED(CONFIG_SPL_LOAD_FIT) &&
image_get_magic(header) == FDT_MAGIC) {
struct spl_load_info load;
debug("Found FIT\n");
load.dev = mmc;
load.priv = NULL;
load.filename = NULL;
load.bl_len = mmc->read_bl_len;
load.read = h_spl_load_read;
ret = spl_load_simple_fit(spl_image, &load, sector, header);
} else if (IS_ENABLED(CONFIG_SPL_LOAD_IMX_CONTAINER)) {
struct spl_load_info load;
load.dev = mmc;
load.priv = NULL;
load.filename = NULL;
load.bl_len = mmc->read_bl_len;
load.read = h_spl_load_read;
ret = spl_load_imx_container(spl_image, &load, sector);
} else {
ret = mmc_load_legacy(spl_image, mmc, sector, header);
}
end:
if (ret) {
#ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
puts("mmc_load_image_raw_sector: mmc block read error\n");
#endif
return -1;
}
return 0;
}
I personally think that the problem may lie in the hardware, but I can't troubleshoot where the problem is, please help me locate the problem and give a way to troubleshoot this problem, thank you very much!
Best Regards,
Youhua
