Reset on Beaglebone Black has become unreliable/broken

[Konstantin Kletschke]

On Thu, Nov 28, 2024 at 12:18:45PM +0100, Ahmad Fatoum wrote:
> 
> Are you still building with the same toolchain?

Yes, I am always using a yocto kirkstone with its toolchain:
    - git clone -b kirkstone git://git.yoctoproject.org/poky.git
    - git -C poky checkout tags/yocto-4.0.13

    and

    - git clone -b kirkstone https://github.com/menschel-d/meta-barebox.git
    - mv meta-barebox poky/meta-barebox

> So repeating these steps on some boards never shows any issues and on
> some others it always shows issues?

Yes

> So this happens even after a completely cold reset?

Yes: Power on, hit S1 or type reset in stopped barebox -> freeze

> I'd suggest you enable CONFIG_DEBUG_LL and look if you see at least a >
> character on the serial console output by the MLO.
> 
> If you don't see it, try moving these lines:
> 
>   am33xx_uart_soft_reset((void *)AM33XX_UART0_BASE);
>   am33xx_enable_uart0_pin_mux();
>   omap_debug_ll_init();
>   putc_ll('>');
> 
> to the start of beaglebone_sram_init() and see if you get the > printed.
> 
> The point is making sure that barebox itself starts up before seeing where
> it's getting stuck.

I will try that immediately.

I reproduced the same behaviour with a non resetting BBB device with
different software setup:

Checked out current barebox git: barebox 2024.10.0-00150-g7a3cb7e6fd63 #2 Thu Nov 28 12:37:15 CET 2024
Changed CONFIG_BAREBOX_MAX_IMAGE_SIZE from 0x1b400 to 0x2b400
Did am335x_mlo_defconfig and omap_defconfig and copied those images.
I used another crosscompiler toolchain for this: gcc-linaro-7.5.0-2019.12-x86_64_arm-linux-gnueabihf

Same error behaviour: Power up -> S1 or "reset" produce freeze.

Will test CONFIG_DEBUG_LL and/or move those lines around.

Regards
Konsti


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