Unable to boot to kernel built from stable 5.11.y

[Andrew D Adamson]

On Fri, 2 Apr 2021 08:31:43 -0600
jim.cromie at gmail.com wrote:

> On Tue, Mar 30, 2021 at 7:16 AM Andrew Adamson <andrewdadamson at gmail.com>
> wrote:
> 
> > Hi Everyone,
> >
> > I tried to build the kernel myself for the first a few days ago. While the
> > build was successful, I am unable to boot to it. After grub I get a
> > blinking cursor for 15 to 30 minutes, and then a message that says "Please
> > reboot and select proper boot device."
> >
> >
> I dont know your higher mission, but I'll suggest:
> 
> punt on grub install at least temporarily,
> Try virtme.
> its a super-easy way to run your built kernel on a VM
> the VM is setup to use your existing installation
> so theres no extra configuration to fuss with.
> 
> [jimc at frodo t2]$ virtme-
> virtme-configkernel    virtme-mkinitramfs     virtme-prep-kdir-mods
>  virtme-run
> 
> 
> this is probably all you need to enable the right features in your built
> kernel,
> basically VIRTIO + NET
> 
> [jimc at frodo t2]$ virtme-configkernel --update
>   GEN     Makefile
> .config:3468:warning: override: reassigning to symbol UEVENT_HELPER
> .config:3469:warning: override: reassigning to symbol VIRTIO
> .config:3472:warning: override: reassigning to symbol NET
> .config:3482:warning: override: reassigning to symbol BINFMT_SCRIPT
> .config:3486:warning: override: reassigning to symbol MODULE_SIG_FORCE
> .config:3487:warning: override: reassigning to symbol DEVTMPFS
> .config:3488:warning: override: reassigning to symbol TTY
> .config:3492:warning: override: reassigning to symbol INOTIFY_USER
> .config:3495:warning: override: reassigning to symbol BLOCK
> .config:3505:warning: override: reassigning to symbol WATCHDOG
> .config:3506:warning: override: reassigning to symbol WATCHDOG_CORE
> .config:3509:warning: override: reassigning to symbol SERIO
> .config:3511:warning: override: reassigning to symbol INPUT
> .config:3518:warning: override: reassigning to symbol FB
> .config:3521:warning: override: reassigning to symbol RTC_CLASS
> .config:3525:warning: override: reassigning to symbol PARAVIRT
> #
> # configuration written to .config
> #
> Configured.  Build with 'make ARCH=x86 -j8'
> [jimc at frodo t2]$
> 
> there are options to let you mount directories, to keep your VMs work,
> so this might satisfy your itch.
> 
> then, you can decide whether you need to mess with grub,
> and if you do, youll have some own-kernel experience to help.
> 
> 
> 
> >

Hi Jim - I did finally manange to build a kernel that would boot. I had to comment out the signature checking that was being turned on by copying in the boot configs from /boot . Now I am able to build and boot kernels successfully. 

Still, thanks for the recommendation. I haven't yet settled on how I want to test my builds, so I'll try it out when i have a chance.

-- 
Andrew D Adamson <andrewdadamson at gmail.com>