[U-Boot] [bug report] sunxi: booting from eMMC

[Alexandr Bochkarev]

Hi!

I am trying to boot my A20 board from eMMC KLM4G1FE3B-B001, but has no success. 
Commenting mmc_change_freq has no effect. 
U-Boot 2016.03 just says Could not determine boot source

I have found, that it stucks in sunxi_mmc_has_egon_boot_signature. 

int sunxi_mmc_has_egon_boot_signature(struct mmc *mmc)
{
	char *buf = malloc(512);
	int valid_signature = 0;

	if (buf == NULL)
		panic("Failed to allocate memory\n");

	if (mmc_getcd(mmc) && mmc_init(mmc) == 0 &&
	    mmc->block_dev.block_read(&mmc->block_dev, 16, 1, buf) == 1 &&
	    strncmp(&buf[4], "eGON.BT0", 8) == 0)
		valid_signature = 1;

	free(buf);
	return valid_signature;
}

mmc_init(mmc) return no errors, seems good, but
block_read returns 0, seems it cant read emmc.


U-Boot 2016.09 says:

mmc_load_image_raw_sector: mmc block read error
SPL: failed to boot from all boot devices
### ERROR ### Please RESET the board ###