LS1046A eMMC support in uboot

[__OTL__]

Hi

On my customized LS1046A board, eMMC can't be recognized by u-boot.

the RCW is

Reset Configuration Word (RCW):
00000000: 0c0d0010 12000000 00000000 00000000
00000010: 10405577 40a00006 40000000 c1000000
00000020: 00200000 00000000 00000000 0003affe
00000030: 20004504 04201102 00000096 00000001

the u-boot config is 

CONFIG_DM=y
CONFIG_DM_MMC=y
CONFIG_FSL_ESDHC=y

Is there any other thing need to be done?

I probed the SDHC_CMD  and found that

once I typed the "mmcinfo" command

only one idle command (0x00) is sent by the host.

(yellow: SDHC_CMD  Green: SDHC_DATA0  Blue:SDHC_CLK)

Refered to the JEDEC Standard

For the card identification mode the host shall send the correct Access mode in CMD1 argument

after the idle state, but on my board there is no CMD1 command be sent.

I wonder if this is the problem.

I am not quite familiar with eMMC, could you give me some advices?

[yipingwang · Accepted solution]

In RCW, please configure RCW[EVDD_VSEL] as 0 and configure RCW[IIC2_EXT] as 0.

[__OTL__]

Thanks,

I forgot set EVDD_VSEL to 0

This solved my problem

(IIC2_EXT=0 is not neccessary in my case)

[__OTL__]

SDHC_CMD, SDHC_DATA[0:3] are pulled up to EVDD (1.8V) by 10kΩ

The other SDHC pins are configured as GPIO by RCW