AM4378: about boot Linux from eMMC

user1201164

Part Number: AM4378

Hi,

Our customer is trying to boot Linux from eMMC on a custom board. However, he is asking for help because u-boot will not boot up.
This board has SD card in MMC0 and eMMC in MMC1.
When I set SYSBOOT[5:0] to b100100 (MMC0), u-boot and kernel boot from SD card and it recognizes eMMC.
After cutting the eMMC into the same partition as the SD card with the fdisk and mkfs commands, the SD card image is written.
Set SYSBOOT[5:0] to b000100 (MMC1) and turn on the power.
When power is turned on, the following log appears and SPL startup is interrupted.

　U-Boot SPL 2020.01 (May 19 2022 - 20:49:01 +0900)
　WDT:   Not found!
　Trying to boot from MMC2
　spl: could not initialize mmc. error: -19
　SPL: failed to boot from all boot devices
　### ERROR ### Please RESET the board ###

Since it works from the SD card, it is assumed that MLO/u-boot is ready to boot.
From the log information, it seems that SPL is unable to find u-boot, but it shows MMC2 or something like that.
Is there anything we should notice or try in this situation?

Best Regards,

Kouji Nishigata

over 1 year ago

0 Hong Guan64 over 1 year ago

TI__Guru 54465 points

Hi,
Can we load the working u-boot MMC boot log in attachment?
Best,
-Hong

0 user1201164 over 1 year ago in reply to Hong Guan64

Expert 1770 points

Hi, Hong

I think you mean the boot log, which is the boot log on the SD-Card.
I will contact the customer to get it for you.

Best Regards,

Kouji Nishigata

0 user1201164 over 1 year ago in reply to user1201164

Expert 1770 points

Hi, Hong

I tried to get the data from the customer, and he said that he added to arch/arm/dts/am437x-gp-evm-u-boot.dtsi, and now it boots.
Can you please confirm the contents?
It seems that he added the eMMC2 settings that appeared in the log that did not boot.

arch/arm/dts/am437x-gp-evm-u-boot.dtsi

&mmc1 {
              u-boot,dm-spl;
};

+ &mmc2 {
+            u-boot,dm-spl;
+ };

&mac {
              u-b

Best Regards,

Kouji Nishigata

+1 Hong Guan64 over 1 year ago in reply to user1201164

TI__Guru 54465 points

Hi Nishigata-san,
Yes, the code change looks good.
Please see the e2e on the same topic for background.
e2e.ti.com/.../3584967
Best,
-Hong

0 user1201164 over 1 year ago in reply to Hong Guan64

Expert 1770 points

Hi, Hong

Thanks for your answer.
I will try to inform the customer.
By the way, this problem always seems to occur with the current code when trying to boot from eMMC1.
Is there any possibility to change it on the TI SDK side?

Best Regards,

Kouji Nishigata

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AM4378: about boot Linux from eMMC