bootloader menu to pick a kernel - what is the current situation in in early 2022?
#1
Hi all. I'm trying to compile and boot a custom kernel on my PineBook Pro. Trying to add some printk instrumentation to troubleshoot a type C hotplug issue I'm having, but I'm getting stuck even getting the kernel to boot at all. I don't want to outright replace my stock kernel, I just want to be able to pick the kernel I want at boot time. Ideally I would want to stick to the principle of a 100% free software (or close to it) process, and using a second computer with a serial cable is not attractive to me.

I am reluctant to try any option that makes my custom kernel the default, unless I also have a working boot menu that lets me pick the stock kernel.

I am using the manjaro OS that came preinstalled, fully updated. I am using the default partition map and bootloader.

I have tried editing my /boot/extlinux/extlinux.conf to look like this:
Code:
Timeout 10
DEFAULT Manjaro ARM

MENU TITLE pick a kernel

LABEL Manjaro ARM
KERNEL /Image
FDT /dtbs/rockchip/rk3399-pinebook-pro.dtb
APPEND initrd=/initramfs-linux.img console=tty1 console=ttyS2,1500000 root=LABEL=ROOT_MNJRO rw rootwait video=eDP-1:1920x1080@60 video=HDMI-A-1:1920x1080@60 bootsplash.bootfile=bootsplash-themes/manjaro/bootsplash

LABEL CUSTOM INSTRUMENTATION
KERNEL /vmlinux-5.17.0-rc1-CUSTOM_INSTRUMENTATION+
FDT /dtbs/rockchip/rk3399-pinebook-pro.dtb
APPEND initrd=/initramfs-custom-instrumentation.img console=tty1 console=ttyS2,1500000 root=LABEL=ROOT_MNJRO rw rootwait video=eDP-1:1920x1080@60 video=HDMI-A-1:1920x1080@60 bootsplash.bootfile=bootsplash-themes/manjaro/bootsplash
This doesn't seem to do anything, just boots right into the stock kernel. I also tried spamming control-C or the arrow keys at boot time, this made no difference, no menu shows up. As I mentioned earlier I am reluctant to change the DEFAULT setting since it might make the system unbootable.

I have also tried using the kexec method. I wrote this script:
Code:
#! /bin/sh
sudo kexec -l /boot/vmlinux-5.17.0-rc1-CUSTOM_INSTRUMENTATION+ --initrd=/boot/initramfs-custom-instrumentation.img --reuse-cmdline

# I tried both of these versions:
#sudo systemctl kexec
sudo kexec -e
It's hard to tell what the hardware is doing on a fanless system, but it appears to just power off the computer when I run the script. Then, when I power it on, I just get a blank screen. I can then hard reset and power it on again, and it boots back into the stock kernel.

I found some prior forum threads on this subject, but it looks like the situation is evolving rapidly and the info there might not be up to date.
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bootloader menu to pick a kernel - what is the current situation in in early 2022? - by maxtothemax - 01-30-2022, 05:06 PM

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