AM3358： Processors forum

zhiyuan lin

Part Number: AM3358
Other Parts Discussed in Thread: AM3352

I am porting Uboot to my new board, which is based on the DESIGN of SBC8600, but the official Uboot Devkit is version 2011, I want to use the 2019 version of TI SDK. I added printouts during the SPL phase by adding configuration, but the display was all jumbled up. Try to modify the baud rate and other parameters of the serial port terminal software, but no effect. I suspect it may be the serial port parameter setting problem, I don't know if you have this reference.

CONFIG_DEBUG_UART_BASE=0x44e09000

CONFIG_DEBUG_UART_CLOCK=48000000

CONFIG_DEBUG_UART=y

CONFIG_DEBUG_UART_OMAP=y

CONFIG_DEBUG_UART_SHIFT=2

CONFIG_DEBUG_UART_ANNOUNCE=y

over 5 years ago

0 Andreas Dannenberg over 5 years ago

TI__Guru 69707 points

I suppose this is related to your other post here? https://e2e.ti.com/support/processors/f/791/t/919858

Do you get proper UART output when you use the official (older) dev kit you mention with the 2011-based U-Boot?
Knowing this will allow us to confirm whether your hardware is good.

If the characters are all garbled up that could point to a clocking/mis-configuration/HW setup issue of sorts.

Regards, Andreas

0 zhiyuan lin over 5 years ago in reply to Andreas Dannenberg

Prodigy 70 points

By modifying setup_DPLls in ARCH/ARM/Mach-omap2 /am33xx/ oct.c, uART can output normally at present.

It's stopped here at the moment.

\je[�cXard.c==>get_dpll_ddr_params
CPU:TI AM3352 DDR:400MHZ

U-Boot SPL 2019.01-gc14892445a-dirty (Jul 09 2020 - 16:34:33 +0800)
Trying to boot from MMC1
---------------------------------------------
spl_load_image_fat_buf: error reading image u-boot.img, err - -12
---------------------------------------------
SPL: failed to boot from all boot devices
### ERROR ### Please RESET the board ###

0 Andreas Dannenberg over 5 years ago in reply to zhiyuan lin

TI__Guru 69707 points

Well that's good progress. Error -12 means "Out of memory" (see U-Boot's include/linux/errno.h) which is odd coming from the SPL loader, and can be challenging to debug, especially remotely over a forum.

Since I don't know anything about your exact hardware or software at this point I'd recommend to re-do the port port cleanly and from scratch based on our board-port how-to guide available here: https://software-dl.ti.com/processor-sdk-linux/esd/docs/06_03_00_106/AM335X/linux/How_to_Guides/Board_Port/U-Boot.html

This will allow you get all clock, DDR/memory, and other issues being worked out systematically and cleanly step by step.

Regards, Andreas