[Buildroot] kernel install from buildroot

[Buildroot] kernel install from buildroot

[ct clmsn]

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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?

Thanks in advance for the assistance and confirming my back-of-the-envelope
verification.

v/r,
ct

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Re: [Buildroot] kernel install from buildroot

[Andreas Ziegler]

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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Re: [Buildroot] kernel install from buildroot

[Andreas Ziegler]

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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Re: [Buildroot] kernel install from buildroot

[ct clmsn]

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Excellent, just like the standard routine I'm familiar with - thanks!

ct

On Wed, Apr 23, 2025, 1:15 AM Andreas Ziegler <br015@umbiko.net> wrote:

> 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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