Allow additional kernel command line options

[herrernst]

I see the kernel args are hardcoded in https://github.com/johang/sd-card-images/blob/master/2nd-stage-files/pre-2nd-stage-files-arm64/etc/initramfs/post-update.d/zz-update-uimg#L22

I have added rootflags=noatime for me to prevent wear-out of my sd-card. Similarly, one maybe wants to have rootflags=discard added if one has an SSD with reliable TRIM feature.
Maybe optional kernel command line args could be read from a config file? Armbian has uEnv.txt, but it shouldn't be to complicated or rely on forked packages. Maybe you have an idea for a simple solution? Thanks

By the way, great project, thank you! I like the minimalist approach very much!

[johang]

I think this is more or less already possible.

Put something like extrabootargs=rootflags=noatime in the file uboot.env in the FAT partition then add \${extrabootargs} to the line you showed.

[herrernst]

Thanks for your answer, unfortunately this had no effect for me (the options in uboot.env didn't get applied).

[johang]

Maybe that's a platform specific feature in U-Boot then.