TDA2SX: uboot dead in a while loop of mmc_startup

LiuGan

Part Number: TDA2SX

Dear TI,

I am trying to debug the mmc initializaiton based on the custom board.

But the uboot code dead in a do while loop in the mmc_startup as follow(mmc_startup--->mmc_send_ext_csd--->mmc_send_cmd--->omap_hsmmc_send_cmd):

While read mmc_base->stat, it keeps return the value 0, so that the while loop can not be breaked.

How should i solve this problem.

BTW, the io voltage of my emmc is fixed at 3.3v.

Here is my dts snippet:

Regards,

Liu Gan

over 6 years ago

0 Vishal Mahaveer over 6 years ago

TI__Mastermind 33390 points

Hi Liu Gan,

Transfer complete bit is not being set.

Few more questions,
- The dts you have shown is from u-boot dts or Kernel dts?
- Also, you are stuck in first stage bootloader (MLO) or second stage bootloaer (u-boot)?

0 LiuGan over 6 years ago in reply to Vishal Mahaveer

Expert 1285 points

Hi Vishal,

The dts is from u-boot.

And i am stuck in the second stage bootloader(u-boot).

This is the function call stack.

board_init_r--->init_env--->env_relocate_spec--->init_mmc_for_dev--->mmc_init--->mmc_complete_init--->mmc_startup--->mmc_send_ext_csd--->mmc_send_cmd--->omap_hsmmc_send_cmd

So, what may caused the transfer complete bit is not being set?

Regards,

Liu Gan

0 Vishal Mahaveer over 6 years ago in reply to LiuGan

TI__Mastermind 33390 points

Hi Liu Gan,

Could you make sure you have the right pinmux and IODELAY configurations for MMC2 pins?
Also, does this board have MMC1 interface, is that functional?

For debug purpose, you could try testing with high speed modes disabled.

Which SDK version are you using?

Regards,
Vishal

0 LiuGan over 6 years ago in reply to Vishal Mahaveer

Expert 1285 points

Hi Vishal,

I am using vision sdk version 3.6 and the corresponded uboot release.

We have no mmc1 reserved in our custom board for the pcb size reason.

We tried to add pull up resistors in the data lines just as the evm's design. Then the emmc device can be initialized normally.

Is this reasonable?

Regards，

Liu Gan.

0 Vishal Mahaveer over 6 years ago in reply to LiuGan

TI__Mastermind 33390 points

Hi Liu Gan,

That should be good. According to JEDEC spec Pull Up resistors on DAT lines are required.
Please refer to section "18.4.6.1.1.1 Permanent PU/PD disabling (SR 2.0 only)" of the TRM

Regards,
Vishal

0 LiuGan over 6 years ago in reply to Vishal Mahaveer

Expert 1285 points

Hi Vishal

Thanks for your help!

Regards,

Liu Gan

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TDA2SX: uboot dead in a while loop of mmc_startup