Re: New kernel doesn?t recognize ufs gpt root filesystem

On 2025-04-21 11:46, Chris wrote:
> On 2025-04-21 10:47, Dag-Erling Smørgrav wrote:
>> Chris <bsd-lists@bsdforge.com> writes:
>>> Can I safely move my new kernel to say, kernel.new while running my 
>>> current
>>> kernel as kernel and rebuild the new kernel with the kernconf corrections?
>> 
>> If you're booted into kernel.old you can just build a new kernel and run
>> `make reinstallkernel` to replace the new (non-working) kernel without
>> touching kernel.old.
> Sorry. But this the first failed kernel in some 40+ years. So I'm now second
> guessing every move I make...
> 
> So if I break to the boot prompt and choose boot kernel.old
> followed by cd /usr/src, make buildkernel KERNCONF=<my-kernel>,
> make reinstallkernel KERNCONF=<my-kernel>
> boot -s
> installworld dance. I'm good to go?
Just an update to indicate I answered myself and performed a
$ mv /boot/kernel.old /boot/kernel (old kernel that worked)
$ cp -rp /boot/kernel /boot/kernel-save (as per your advice)
left broken /boot/krernel.new as is.
rebooted
with revised KERNCONF now in place
$ cd /usr/src
$ make -j4 -DALWAYS_CHECK_MAKE buildkernel KERNCONF=<MYKERNCONF>
$ make -j4 -DALWAYS_CHECK_MAKE installkernel KERNCONF=<MYKERNCONF>
rebooted single-user
perform the installworld dance
reboot
build/install iwlwifi-firmware
reboot
now having an internet connection again
build/install gpu/drm bits and reboot to a fully working system.

Thanks a million to you,Warner and Gary for all the time you gave
me for this. Sorry for being a bit of a PITA. :(

--Chris
>> 
>> Same if you're booted into the new kernel with some sort of workaround
>> and want to preserve the old kernel.
>> 
>> It is 100% safe to replace or rename the kernel and modules, even the
>> one you're currently running.  Just be aware that you may have trouble
>> loading modules afterward.  If for instance you boot into kernel.old and
>> then rename /boot/kernel.old to /boot/kernel.works as I suggested
>> earlier, you won't be able to load kernel modules until you update
>> `kern.bootfile` to point to the new location of the running kernel
>> (`make installkernel` does this when it renames the running kernel to
>> kernel.old).
>> 
>> DES

-- 
sent from hardware written from and running on FreeBSD