[fedora-arm] Re: Question: kernelopts on raspberry pi

On 9/9/20 6:57 PM, Stuart D Gathman wrote:
> On Wed, 9 Sep 2020, Steven A. Falco wrote:
>
>> But that doesn't seem to have any effect.  After booting, I still see:
>>
>> # cat /proc/cmdline
>> BOOT_IMAGE=(hd1,msdos2)/vmlinuz-5.8.0-1.fc33.aarch64 root=UUID=36a097ba-7577-4cc9-977e-df76c6590c48 ro
>>
>> Where does the kernel get its command line on RPi?
>
> I have an rPi3 and Pinebook.  Same place as Intel.
>
>   grubby --info=DEFAULT
>
> shows default boot
>
>   grubby --info=ALL
>
> to show all kernels
>
> https://fedoramagazine.org/setting-kernel-command-line-arguments-with-fedora-30/
>
> Here is Pinebook:
>
>   # grubby --info=DEFAULT
>   index=0
>   kernel="/boot/vmlinuz-5.8.6-201.fc32.aarch64"
>   args="ro"
>   root="/dev/mapper/pinevg-f32"
>   initrd="/boot/initramfs-5.8.6-201.fc32.aarch64.img"
>   title="Fedora (5.8.6-201.fc32.aarch64) 32 (Thirty Two)"
>   id="8814846c48db47e2bb50c252d4bc0a29-5.8.6-201.fc32.aarch64"
>
> Note that root and args are defaulted to kernelopts in grubenv.
>
>   # grub2-editenv list
>   saved_entry=8814846c48db47e2bb50c252d4bc0a29-5.8.6-201.fc32.aarch64
>   kernelopts=root=/dev/mapper/pinevg-f32 ro
>   boot_success=1
>   boot_indeterminate=0
>

Thanks. I've learned a little more. I have a Pi that is running F32. It works correctly - if I add "selinux=0" to /etc/default/grub, then run grub2-mkconfig, then reboot, then I do see the selinux=0 parameter in /proc/cmdline. However, on a second Pi that is running Rawhide, the exact same steps don't work.

One clue may be that when I run grub2-mkconfig on Rawhide, I get a warning:

pif# grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration file ...
/etc/grub.d/30_uefi-firmware: line 34: warning: command substitution: ignored null byte in input
done

This warning is not present in F32.

One other bit of info: on the Rawhide system, if I edit /boot/loader/entries/1cba1c70b65f41128fb4b94953fc3741-5.8.0-1.fc33.aarch64.conf and put the selinux=0 setting in that file, then it works, i.e. I do see selinux=0 on /proc/cmdline after a reboot.

I'll have to try reloading the Rawhide system with a fresh image to see if that makes any difference.

Steve
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