DRA722: Uboot start failed

user5361157

Part Number: DRA722
Other Parts Discussed in Thread: CSD

hi:

The SDK version I use is PROCESSOR-SDK-LINUX-AUTOMOTIVE 6_00_00_03.

Sometimes uboot will stop at the following position, but it will not stop here every time, sometimes it can start normally.

U-Boot SPL 2019.01 (May 12 2020 - 17:03:18 +0800)
DRA722-GP ES2.1
Trying to boot from MMC2_2
no pinctrl state for default mode
spl: mmc init failed with error: -22
SPL: failed to boot from all boot devices
### ERROR ### Please RESET the board ###

I locate the error code in the following file:uboot\drivers\mmc\mmc.c

In the following functions:mmc_startup_v4()

The following code in this function returns an error:

if(ext_csd[EXT_CSD_REV] >= ARRAY_SIZE(mmc_versions))

return -EINVAL;

What is the meaning of this code and why there are errors here？

over 3 years ago

0 Vishal Mahaveer over 3 years ago

TI__Mastermind 32680 points

Hi,

If it's failing at the point you mentioned, it means that the eMMC version is not supported. The max version is version 5.1.
Which eMMC part is on your board?

Regards,
Vishal

0 Vishal Mahaveer over 3 years ago in reply to Vishal Mahaveer

TI__Mastermind 32680 points

Sorry, missed the point about it fails only some times.

Could you test by disabling below config options in u-boot?

CONFIG_MMC_HS200_SUPPORT=n
CONFIG_SPL_MMC_HS200_SUPPORT=n

0 user5361157 over 3 years ago in reply to Vishal Mahaveer

Intellectual 435 points

My EMMC version is 5.1,

1、what's the principle of disabling hs200 mode?

2、Our circuit board EMMC is set to hs200 mode, will disabling this item have an impact?

3、Can I fix the EMMC version to 5.1 in the program to solve the problem of version detection error?

0 Vishal Mahaveer over 3 years ago in reply to user5361157

TI__Mastermind 32680 points

1) Just trying to see if that affects the behavior. It's a data point at the moment.
2) No, it will work in lower speed mode. Note that we are doing a test to disable this only in u-boot. Kernel will enumerate again in HS200 mode.
3) If ext_csd register cannot be read properly, there will be other issues. This will not resolve the issue.

0 user5361157 over 3 years ago in reply to Vishal Mahaveer

Intellectual 435 points

I tested in 52mhz mode, but still failed to start. I saw that the EMMC version value read was 85

0 Vishal Mahaveer over 3 years ago in reply to user5361157

TI__Mastermind 32680 points

Hi,

The value of ext_csd[EXT_CSD_REV] should have been 8 for eMMC v 5.1.

-- When the board boots, does eMMC functional normally in u-boot and Kernel?
-- Can you share the eMMC portion of your schematics?
-- Can you share the padconfiguration you are doing for eMMC in u-boot?

Regards,
Vishal

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DRA722: Uboot start failed