Linux/AM3351: AM335 U-boot error in custom board

Apurva Ankleshwaria89

Part Number: AM3351

Tool/software: Linux

Hi,

We have a custom board referenced from Beaglebone black design. We built SPL and U-boot making changes in the U-boot code necessary for our custom board. We have only EMMC flash on board. Now, we load SPL and U-boot through JTAG using CCS. After loading SPL, I get below error.

U-Boot SPL 2018.11-rc1-00130-g0a60a81-dirty (Nov 05 2018 - 15:05:15 +0530)
SPL: failed to boot from all boot devices
### ERROR ### Please RESET the board ###

Post this when I load U-boot, the code crashes and goes to an SRAM location which is branching to the same location.

I initially doubted DDR hardware issue, but then I followed the link below which confirmed that DDR is working fine.

Please let me know of a possible solution here. Thank you!

over 7 years ago

0 Pavel Botev over 7 years ago

TI__Guru**** 170625 points

Hi Apurva,

Do you use AM335x TI PSDK Linux? If yes, which version?

Regards,
Pavel

0 Apurva Ankleshwaria89 over 7 years ago in reply to Pavel Botev

Intellectual 460 points

Hi Pavel,

I tried using Arago and Debian distribution. In Arago I am not seeing anything on the UART, while on debian I am seeing error mentioned above. Both the distribution I am using the latest version.

0 Pavel Botev over 7 years ago in reply to Apurva Ankleshwaria89

TI__Guru**** 170625 points

Apurva,

In this forum we can help only for TI PSDK Linux (Arago), you can get the latest version from the link below:

software-dl.ti.com/.../index_FDS.html

For non-booting custom board, you can check below wiki:

processors.wiki.ti.com/.../AM335x_board_bringup_tips

Regarding Debian distribution, this is supported from BeagleBoard community.

regards,
Pavel

0 Apurva Ankleshwaria89 over 7 years ago in reply to Pavel Botev

Intellectual 460 points

Hi Pavel,

As i said, I am facing the issue on both the distribution. For now, lets focus on Arago.

I am getting that error message on UART. I have already referred the board bringup tips link you have posted. The link has not helped.

After SPL has loaded, I am not able to load U-boot. Kindly suggest possible reasons to debug. Thank you!

0 Pavel Botev over 7 years ago in reply to Apurva Ankleshwaria89

TI__Guru**** 170625 points

Apurva,

Can you provide me the Arago linux boot up log?

Also, you are not using eMMC to boot, but loading SPL/u-boot from JTAG, is that correct? Can you provide your steps, I can check if something is wrong or missing.

Check also if below pointers will be in help:

training.ti.com/linux-board-porting-series-module-7-debugging-u-boot-jtag-ccs

training.ti.com/.../sitara_boot_camp_11_uboot_linux_kernel_debug_using_ccsv5.pptx

processors.wiki.ti.com/.../Sitara_Linux_Training:_uboot_linux_debug_with_ccsv5_sdk7

Regards,
Pavel

0 Apurva Ankleshwaria89 over 7 years ago in reply to Pavel Botev

Intellectual 460 points

Hi Pavel,

The logs are the same which I mentioned in the question:

U-Boot SPL 2018.11-rc1-00130-g0a60a81-dirty (Nov 05 2018 - 15:05:15 +0530)
SPL: failed to boot from all boot devices
### ERROR ### Please RESET the board ###

I am not getting anything else on the UART.

I am following the exact process mentioned in the Module 7 of Linux porting series ( Booting through JTAG )

For your reference, let me elaborate the changes I have made in the SDK for the custom board:

1. Changed the DDR PHY and timing registers as mentioned in below link

The DDR test is also passing with the updated register values. The changes were done in "arch/arm/include/asm/arch-am33xx/ddr_defs.h" file.

2. Created a copy of board/ti/am335x/ folder to board/ti/minnie folder. Made changes in board.c, board.h, Kconfig and mux.c. Special mention on removing the EEPROM part of the code ( minnie is the name of our custom board)

3. Copied arch/arm/dts/am335x-boneblack.dts to arch/arm/dts/minnie.dts and made relevant changes

4. Copied configs/am335x_evm_deconfig to configs/minnie_defconfig and made minor changes

5. Copied include/configs/am335x_evm.h to include/configs/minnie.h and made relevant changes

6. Added lines in arch/arm/dts/Makefile, arch/arm/mach-omap2/Kconfig and arch/arm/mach-omap2/am33xx/Kconfig to refer to the new files created earlier

Also, I have tried booting through UART. The Uboot code is crashing and after a delay of 5-10 seconds, I start getting 'C' character on UART. Followed below link to do that

Please let me know if I have missed any changes to be done or doing something wrong. Thank you!

0 Pavel Botev over 7 years ago in reply to Apurva Ankleshwaria89

TI__Guru**** 170625 points

Apurva,

You state that you are using AM335x TI PSDK (Arago Linux), but your boot log reports "U-Boot SPL 2018.11-rc1-00130-g0a60a81-dirty", while the latest version of the PSDK comes with u-boot-2018.01

ti-processor-sdk-linux-am335x-evm-05.01.00.11/board-support/u-boot-2018.01+gitAUTOINC+cdb1cc0a9e-gcdb1cc0a9e

I would suggest you to try with u-boot-2018.01 that is coming with PSDK 5.01, as this is newest u-boot tested and verified by TI.

Regarding "SPL: failed to boot from all boot devices" - I would suggest you to enable debug() messages and check if you will have more informative boot log. Check also how the flow goes through BBB and compare with your custom board.

u-boot-2018.01/common/spl/spl.c

Check also if below e2e threads will be in help:

e2e.ti.com/.../744026

e2e.ti.com/.../2715707
e2e.ti.com/.../2570061
e2e.ti.com/.../706154
e2e.ti.com/.../2620655
e2e.ti.com/.../731889
e2e.ti.com/.../604868

Regards,
Pavel

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Linux/AM3351: AM335 U-boot error in custom board