Re: [Buildroot] kernel install from buildroot

[Andreas Ziegler <br015@umbiko.net>]

Hi Chris,

[re-added the mailing list]

On 2025-04-22 14:07, ct clmsn wrote:
> Andreas,
> 
> Thanks for the prompt response; looks like I miscommunicated the 
> situation.
> I've build the kernel on the nvme-ssd that is running the kernel I'm 
> hoping
> to replace with the buildroot compiled kernel. I'm expecting to just 
> copy
> the portions from /boot, /lib/modules, and /lib/firmware from the
> `buildroot/output/target` directory into the appropriate places in the
> nvme-sdd's '/' (root) directory. Hope this clarifies the situation.

lib/firmware is nice-to-have, but not mandatory; you can update 
linux-firmware independently of the kernel.

For a new kernel, you need bzImage and lib/modules/$(uname -r). The 
location of lib/modules is on the root partition. Depending on the boot 
configuration, bzImage may reside in /boot or on a separate boot 
partition. Check your grub.cfg.

If you keep the old kernel and create an additional boot entry for the 
new one, you have a fallback solution.

Kind regards,
Andreas

> v/r,
> Chris
> 
> On Sat, Apr 19, 2025 at 11:26 AM Andreas Ziegler <br015@umbiko.net> 
> wrote:
> 
>> Hi ct,
>> 
>> On 2025-04-18 16:03, ct clmsn wrote:
>> >
>> > Hello,
>> >
>> > This should be a pretty trivial question mostly asking to make sure my
>> > assumptions are correct.
>> >
>> > I'm doing hardware testing with an SBC. I have an SBC that is
>> > configured to
>> > boot from an NVME-SSD. A vendor encouraged me to use buildroot to
>> > compile a
>> > new kernel. My preference would be to just update the existing
>> > environment
>> > on my SBC's NVME-SSD.
>> >
>> > Given `buildroot/output/target` contains the compiled linux kernel with
>> > firmware, which directories or files should I be concerned with copying
>> > over on the NVME-SSD?
>> 
>> Buildroot copies the final kernel image to output/images. In addition
>> you need the content of output/target/lib/modules.
>> 
>> Kind regards,
>> Andreas
>> 
>> > Thanks in advance for the assistance and confirming my
>> > back-of-the-envelope
>> > verification.
>> >
>> > v/r,
>> > ct
>> 
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