Getting devkit into serial download mode sometimes fails.
I tried to flash a devkit (devkit A) with uuu as of c81a5dab but the uuu script
uuu_version 1.0.1 SDP: boot -f u-boot-devkit-recovery.imx SDPU: delay 1000 SDPU: write -f u-boot-devkit-recovery.imx -offset 0x57c00 SDPU: jump SDPS: boot -f u-boot-devkit-recovery.imx SDPU: delay 1000 FB: ucmd setenv fastboot_dev mmc FB: ucmd setenv mmcdev 0 FB: flash -raw2sparse all devkit.img FB: Done
would stop at
1:1 1/ 1 [============100%============] SDP: boot -f u-boot-devkit-recovery.imx`
The serial console output showed
I then tried another board (devkit B) and flashing worked right away. I then retried devkit A again and it seem that it matters which way of the USB-C plug is up. One way works, the other doesn't. That's 100% reproducible here atm.