AM625: ** Unable to read file u-boot.img ** SPL: failed to boot from all boot devices ### ERROR ### Please RESET the board ###

Toby,

toby Tang said:

When I compile gp image and start through SD card, I always need to press the reset button to successfully start, can you tell me what the reason is and how to fix it？

Do you mean if you pressed the reset button, you can boot into Linux successfully? Is this on SK-AM62 or your AM625 custom board?

• Yes, I use a custom board. I developed it myself. What's the solution

• After pressing reset, it can start normally

• Please let me know if I am still paying attention to this problem, thank you

Hi Tody,

toby Tang said:

After pressing reset, it can start normally

What is the "reset"? Is it a button on your board? If so, which pin is the button connected to?

F20  RESET_REQz

I pressed the reset button on the board, which is normal when 8.6gp mirroring is not used, but will appear when gp mirroring is used.

Now I doubt whether it is the problem of picking cards on the board, because the same SD card mirror does not appear on SK-AM62 EVM, and it can be started normally. Do you have any ideas? Thank you very much.

Hi Toby,

the picture doesn't show which pin is the reset button connected to.

toby Tang said:

which is normal when 8.6gp mirroring is not used

what is 8.6gp mirroring?

Just for testing, can you please try to add DT property 'no-1-8-v;' to sdhci1 node in U-Boot arch/arm/dts/k3-am62-main.dtsi and rebuild U-Boot? And let me know if pushing the reset button is still needed.

About gp picture is actually suitable for gp device tiboo3.bin file, I refer to the following link compiled

[FAQ] AM625: How to boot from R5 U-Boot SPL directly into the Linux Kernel, skipping A53 SPL and A53 U-Boot (Falcon Mode) - Processors forum -

Processors - TI E2E support forums

The RESET_REQz pin is connected to the cpu, I tried to add no-1-8-v to the device tree; You still need to press RESET after testing

Hi Toby,

It seem your vdd_mmc1 and vdd_sd_dv do not switch controlled by a GPIO. Please see how these two DT nodes are defined for the SK-AM62 evm.

You can also check the power sequence especially on the SoC reset and MMC power rails, and comparing it with how the SK-AM62 evm does.

I found a problem. When this happened, I used the oscilloscope to check that the SD card clock frequency was 200mhz and could not be started. After pressing the reset button, the clock frequency was 50mhz and the SD card was successfully started.

For the test of the image compiled by the patch without the following link, the clock has been maintained at 50mhz and the startup is normal

May I ask why the image compiled by the patch inserted according to the following connection has a difference in SD clock? Where should I change the clock frequency of the SD card

The following links provide patch files

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1210443/faq-am625-generating-sitara-am62x-am62ax-am64x-gp-device-bootable-mmc-sd-card-images-using-sdk-v8-6-and-yocto

Hi Toby,

Do you mean the issue doesn't happen if you don't apply patch "0001-am62xx-evm-Make-AM62x-GP-device-variant-the-default-.patch" mentioned in the E2E FAQ, but the issue happens when this patch is applied?

Yes, I applied this patch to solve another problem I had (DDR1G boot failure, the application of this patch compiled tiboo3.bin can solve).

In addition, I wonder if it has something to do with the clock frequency of the SD card I commented on above, because our board and the evm design are somewhat different, the SD card voltage is 3.3v, while the evm can switch between 1.8v and 3.3v

Hi Toby,

I asked to add "no-1-8-v;" DT property to file k3-am62x-main.dtsi, but it seems you added it to k3-am62x-sk-common.dtsi. If this was the case, you would need to add it to k3-am62x-sk-common-u-boot.dtsi as well.