uboot如何支持emmc5.0

[void_]

大家好，最近板子换了颗5.0版本的emmc后uboot就启动不了，以前的旧板子是4.4的可以正常启动

U-Boot 2014.04 (Mar 22 2017 - 14:17:58)

CPU: Freescale i.MX6Q rev1.5 at 792 MHz
CPU: Temperature 33 C, calibration data: 0x5884df7d
Reset cause: POR
Board: MX6-SabreSD
I2C: ready
DRAM: 1 GiB
MMC: FSL_SDHC: 0, FSL_SDHC: 1, FSL_SDHC: 2
MMC init failed              (一直提示初始化失败)
Using default environment

No panel detected: default to Hannstar-XGA
Display: Hannstar-XGA (1024x768)
In: serial
Out: serial
Err: serial
mmc2(part 0) is current device
Net: Phy not found
PHY reset timed out
FEC [PRIME]
Warning: failed to set MAC address

Normal Boot
Hit any key to stop autoboot: 0
mmc2(part 0) is current device
Booting from net ...
*** ERROR: `ethaddr' not set
*** ERROR: `ethaddr' not set
Bad Linux ARM zImage magic!

我看了其他论坛也有人出现过这个，但没人给出有用的结论，不知道这里是否有人遇到过这个问题，kernel中有emmc版本的判断这个我知道，不知道uboot中是否也有这样的判断呢？

[westbrook]

Hi, HongBo Liu

I faced this "MMC init failed" issue after I change the board boot kind. Originally the customized board is boot from SPI flash, I change to boot from eMMC, then this failed issue happened.

I found the reason of this issue, in the mmc_get_env_devno() function, it will get teh mmc device number, this is number is set by board_mmc_init() function. My emmc is 0 when boot from SPI flash, when boot from eMMC, the eMMC is set to 1.

int mmc_get_env_devno(void)
{
u32 soc_sbmr = readl(SRC_BASE_ADDR + 0x4);
u32 dev_no;
u32 bootsel;

bootsel = (soc_sbmr & 0x000000FF) >> 6 ;

/* If not boot from sd/mmc, use default value */
if (bootsel != 1)
return CONFIG_SYS_MMC_ENV_DEV;

/* BOOT_CFG2[3] and BOOT_CFG2[4] */
dev_no = (soc_sbmr & 0x00001800) >> 11;

/* need ubstract 1 to map to the mmc3 device id
* see the comments in board_mmc_init function
*/
if (2 == dev_no)
//dev_no--;

dev_no = CONFIG_SYS_MMC_ENV_DEV;     => I fix this issue by modify the device number 

return dev_no;
}

BR,

Xiao

[Rita_Wang]

Hi,

You can refer to the document I created in our communityEMMC 5.0 and EMMC 5.1 work on i.MX6 ,hope this can help you. You neeed to modify the value of card->ext_csd.rev.
Have a great day,
Rita

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[void_]

你好，@Rita Wang

你说的kernel部分的修改我了解，我所遇到的问题是uboot启动时就出错了，在emmc5.0的板子上我成功启动过 i.MX6 Linux BSP (L3.0.35_4.1.0)，其中这个版本的uboot-2009.08是不需要做修改。现在我用的是uboot-2014.04，我对比过mmc部分的代码，两者有很大的区别

[Rita_Wang]

你使用的是我们官网哪个版本的BSP？你使用mfgtool烧写，可以成功烧写吗？

[void_]

我使用的是yocto工程，里面uboot是2014.04版本的，kernel是3.10.53版本。mfgtool原本是不能烧录的，后来我修改了kernel中的card->ext_csd.rev，重新编译了kernel固件现在是可以烧录的，但烧录后uboot一直起不来，提示mmc初始化失败

[sunshineyang]

请问问题解决了吗？我也遇到同样的问题

[guangyang]

我也遇到这个问题了，你解决了吗