AM3359: Getting CCCCCCCCCC print continuously after loading u-boot.img file

Rakshith kumar I M

Part Number: AM3359

Hii TI support team,

we have am3359 based processor custom board we are able to load u-boot-spl.bin file through uart using xmode but when we try to load u-boot.img file through uart using ymod we are getting CCCCCC print continuously as shown in below log file:

U-Boot SPL 2019.10-00189-g78d8ebd-dirty (Mar 30 2023 - 15:44:23)
Load U-Boot image...
CxyzModem - CRC mode, 1(SOH)/376(STX)/0(CAN) packets, 3 retries
Loaded 384908 bytes
display_banner

U-Boot 2019.10-00189-g78d8ebd-dirty (Mar 30 2023 - 15:44:23)

init_func_i2c
I2C: ready
display_dram_config
DRAM: 256 MiB

CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC

Regards

Rakshith I M

over 2 years ago

0 Suren Porwar over 2 years ago

TI__Mastermind 27875 points

Hi Rakshith,

I have forwarded your query to our expert. In the meantime, I found this thread, that might be of use:

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/764946/linux-am3359-unable-to-boot-custom-board-through-uart

Hope this helps.

Best Regards

Suren

0 Hong Guan64 over 2 years ago in reply to Suren Porwar

TI__Guru 68210 points

Hello,
The log seems indicating u-boot.img was loaded over UART, and u-boot.img started booting, but somehow crashed...
Some pointers
software-dl.ti.com/.../U-Boot.html
software-dl.ti.com/.../Applications.html
Best,
-Hong

0 Rakshith kumar I M over 2 years ago in reply to Hong Guan64

Prodigy 40 points

Hi Hong,

Thank you for your quick response.

I have read the above link but did not any clue for possible reason for our board.

When we are loading same u-boot-spl.bin and u-boot.img file in same other board ,U-Boot is loading properly.

We have checked DDR ,which is connected to Processor and it's working fine.

We are loading u-boot-spl.bin and u-boot.img in Nand Flash and it's working fine,also we have verified all the signal of Nand Flash.

I am not understanding why processor is getting reset (CCCCCCCC print) just after loading U-Boot.img file.

Please tell me hardware and Software possibility for continuous CCCCCCC print.

Note:

We have observed CS of Nand Flash is continuously toggling with same pattern, when we probed on oscilloscope.

Regards,

Rakshith

0 Hong Guan64 over 2 years ago in reply to Rakshith kumar I M

TI__Guru 68210 points

Hello Rakshith,
One hypothesis is once u-boot.img is loaded and stated to run on target, it crashes and triggers SoC reset.
"cccc..." is output by ROM from UART boot...
Best,
-Hong

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AM3359: Getting CCCCCCCCCC print continuously after loading u-boot.img file