SK-AM62: Trouble flashing SK-AM62-LP using USB DFU mode

An addition, I saw now that we actually seem to get some UART serial console output when flashing via USB DFU sometimes. But we only get this: 

U-Boot SPL 2021.01-00001-g45cb7e44ae (Jun 14 2023 - 15:45:27 +0200)
SYSFW ABI: 3.1 (firmware rev 0x0008 '8.6.4--v08.06.04 (Chill Capybar')
SPL initial stack usage: 13424 bytes

And then nothing...

Hi,

You seem to have an AM62-lp SK not AM62x SK board. Those binaries will not boot on your board. You need to build U-boot with the following defconfigs:
- am62x_lpsk_a53_defconfig
- am62x_lpsk_r5_defconfig

~ Judith

Hello Judith, 

Thank you for the answer. I tried to build with those defconfigs and made a litlle bit further. 
Now when I try to download the tiboot3.bin using "dfu-util" this happens: 

>> sudo dfu-util -R -a bootloader -D tiboot3.bin
dfu-util 0.9

Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.
Copyright 2010-2016 Tormod Volden and Stefan Schmidt
This program is Free Software and has ABSOLUTELY NO WARRANTY
Please report bugs to sourceforge.net/.../

dfu-util: Invalid DFU suffix signature
dfu-util: A valid DFU suffix will be required in a future dfu-util release!!!
Opening DFU capable USB device...
ID 0451:6165
Run-time device DFU version 0110
Claiming USB DFU Interface...
Setting Alternate Setting #0 ...
Determining device status: state = dfuIDLE, status = 0
dfuIDLE, continuing
DFU mode device DFU version 0110
Device returned transfer size 512
Copying data from PC to DFU device
Download [=========================] 100% 314198 bytes
Download done.
state(6) = dfuMANIFEST-SYNC, status(0) = No error condition is present
dfu-util: unable to read DFU status after completion
dfu-util: can't detach
Resetting USB to switch back to runtime mode


And then in the Micro USB serial console i get this: 

U-Boot SPL 2021.01-00001-g45cb7e44ae (Jun 15 2023 - 08:19:10 +0200)
SYSFW ABI: 3.1 (firmware rev 0x0008 '8.6.4--v08.06.04 (Chill Capybar')
SPL initial stack usage: 13424 bytes
SPL: Unsupported Boot Device!
SPL: failed to boot from all boot devices
### ERROR ### Please RESET the board ###

I tried to reset the board (both soft and hard reset) but it did not help. 
Could it be that the defconfigs that you supplied doesn't support DFU boot maybe? 
- am62x_lpsk_a53_defconfig
- am62x_lpsk_r5_defconfig 

I know that the defconfigs for other boards needs to have "_usbdfu_" in the name of the defconfig for DFU boot to work. 

Best regards

Johan

We abandoned the DFU USB boot for our board since we couldn't find any defconfigs with DFU support in the SDK. 

However, we switched to SD card boot now and we used the tiboot3.bin, tispl.bin an u-boot.img that we got using the 
 
- am62x_lpsk_a53_defconfig
- am62x_lpsk_r5_defconfig

We also flashed an SD card with a default image from the TI SDK: tisdk-default-image-am62xx-evm.wic.xz 

And then we changed the boot-files on the boot partition to the ones we created above. 

Now we get U-boot to come further but then it fails in the end with this: 

U-Boot SPL 2021.01-00001-g45cb7e44ae (Jun 15 2023 - 10:54:51 +0200)
SYSFW ABI: 3.1 (firmware rev 0x0008 '8.6.4--v08.06.04 (Chill Capybar')
SPL initial stack usage: 13424 bytes
Trying to boot from MMC2
Authentication passed
Authentication passed
Authentication passed
Authentication passed
Authentication passed
Loading Environment from MMC... *** Warning - No MMC card found, using default environment

Starting ATF on ARM64 core...

NOTICE:  BL31: v2.8(release):v2.8-226-g2fcd408bb3-dirty
NOTICE:  BL31: Built : 05:06:58, Feb 24 2023

U-Boot SPL 2021.01-00001-g45cb7e44ae (Jun 15 2023 - 10:54:47 +0200)
SYSFW ABI: 3.1 (firmware rev 0x0008 '8.6.4--v08.06.04 (Chill Capybar')
Trying to boot from MMC2
Warning: Did not detect image signing certificate. Skipping authentication to prevent boot failure. This will fail on Security Enforcing(HS-SE) devices
Warning: Did not detect image signing certificate. Skipping authentication to prevent boot failure. This will fail on Security Enforcing(HS-SE) devices


U-Boot 2021.01-00001-g45cb7e44ae (Jun 15 2023 - 10:54:47 +0200)

SoC:   AM62X SR1.0 HS-FS
Model: Texas Instruments AM62x LP SK
EEPROM not available at 0x50, trying to read at 0x51
Board: AM62-LP-SKEVM rev E2
DRAM:  2 GiB
NAND:  0 MiB
MMC:   mmc@fa10000: 0, mmc@fa00000: 1, mmc@fa20000: 2
Loading Environment from MMC... OK
In:    serial@2800000
Out:   serial@2800000
Err:   serial@2800000
Net:   eth0: ethernet@8000000port@1
Hit any key to stop autoboot:  0 
switch to partitions #0, OK
mmc1 is current device
SD/MMC found on device 1
Failed to load 'boot.scr'
1490 bytes read in 3 ms (484.4 KiB/s)
Loaded env from uEnv.txt
Importing environment from mmc1 ...
Running uenvcmd ...
1 bytes read in 3 ms (0 Bytes/s)
Already setup.
19147264 bytes read in 760 ms (24 MiB/s)
Failed to load '/boot/k3-am62x-lp-sk.dtb'
libfdt fdt_check_header(): FDT_ERR_BADMAGIC
No FDT memory address configured. Please configure
the FDT address via "fdt addr <address>" command.
Aborting!
ERROR: Did not find a cmdline Flattened Device Tree
Could not find a valid device tree

Hi Johan,

Yes, there does not seems to be usbdfu defconfigs for your board in TI-U-boot, therefore I am not sure it has been validated.

So the PSDK for AM62-lp has not been released yet, that is why you cannot find much information. Although it will be available here soon: https://software-dl.ti.com/cicd-report/linux/ under AM62p device. You can then flash the .wic image to boot your board.

If not, you are in the correct track, it should work. Except you need to place k3-am62x-lp-sk.dtb  in the root/boot partition of the SD card.

~ Judith

Hello Judith, 

Thank you for your reply. 

Yes, it seems like this board doesn't have that much support yet based on the documentation. 

However, following the documentation here: https://dev.ti.com/tirex/explore/node?node=A__AHlqIk-7QQxAvfmhk-DlOA__linux_academy_am62x__XaWts8R__LATEST 
I was able to build the bootchain, custom kernel and use the filesystem from the default TI image and get it to boot from SD card. 

I will see if I run into any more problems down the line. 

Best regards
Johan

Hi,

Great, keep me posted.

~ Judith