Booting verdin-imx8mm_defconfig fails

[Marcel Ziswiler]

Hi Manuel

Please note that Philippe is no longer with Toradex.

On Mon, 2023-05-08 at 13:49 +0200, Manuel Traut wrote:
> Hi,
> 
> I am not able to run u-boot for the Toradex Verdin i.MX8MMini.

We call it the Verdin iMX8M Mini.

> I am not sure if I built/using u-boot as intended for this platform.

I would advice to stick to the documentation [1].

> DDR firmware used from:
> https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/firmware-imx-8.19.bin
> and arm-trusted-firmware 2.8.0
> 
> u-boot was built with the following commands:
> 
> --8<--
> debian$ export CROSS_COMPILE=aarch64-linux-gnu-
> debian$ export ARCH=arm64 BL31=/usr/lib/arm-trusted-firmware/imx8mm/bl31.bin
> debian$ make verdin-imx8mm_defconfig
> debian$ make -j6 flash.bin
> --8<--
> 
> 1) running via serial download:

Please note that we never integrated/validated USB device support on Verdin iMX8M Mini (and Plus for that
matter). So one really can NOT use UUU with upstream U-Boot so far and does have to stick to what we document.

> ===============================
> 
> --8<--
> debian$ sudo uuu SDP: boot -f flash.bin
> uuu (Universal Update Utility) for nxp imx chips -- lib1.4.193
> 
> Success 0    Failure 0
> 
> 
> 1:4      1/ 1 [=================100%=================] SDP: boot -f flash.bin
> Okay
> --8<--
> 
> Produces the following output:
> 
> --8<--
> U-Boot SPL 2023.07-rc1-00199-g1917a1a8a8 (May 08 2023 - 13:11:50 +0200)
> WDT:   Started watchdog at 30280000 with servicing every 1000ms (60s timeout)
> SPL: failed to boot from all boot devices
> ### ERROR ### Please RESET the board ###
> --8<--
> 
> 
> 2) running from SDCard:

As all our SoMs are factory fused to boot from their on-module eMMC storage one can NOT boot them from an SD
card.

> =======================
> 
> --8<--
> debian$ sudo dd if=flash.bin of=/dev/sdb bs=1024 seek=33
> 1206+1 records in
> 1206+1 records out
> 1234992 bytes (1.2 MB, 1.2 MiB) copied, 0.260789 s, 4.7 MB/s
> debian$ sync
> --8<--
> 
> Pressing the 'recovery' switch while reseting the board:
> Boots into Serial Download Mode
> 
> Just reseting the board:
> Boots into Serial Download Mode
> 
> 3) running from eMMC:

Please stick to the documentation and skip 2 blocks when writing to the first hardware area boot partition.

> =====================
> 
> (no sdcard plugged in)
> 
> --8<--
> imx8mm$ echo 0 > /sys/block/mmcblk1boot0/force_ro
> imx8mm$ dd if=flash.bin of=/dev/mmcblk1boot0
> imx8mm$ echo 1 > /sys/block/mmcblk1boot0/force_ro
> imx8mm$ reboot
> --8<--
> 
> Boots into Serial Download Mode

If anything goes wrong the boot ROM usually falls back to serial download mode. There are ways to look at what
exactly you may have done wrong see e.g. [2].

> Any ideas?
> 
> Kind regards
> Manuel

[1] https://source.denx.de/u-boot/u-boot/-/blob/master/doc/board/toradex/verdin-imx8mm.rst
[2] https://www.nxp.com/webapp/Download?colCode=AN12853

Cheers

Marcel