How to chain u-boot with something that I don't understand.

[Mario Marietto]

My chromebook is not based on the mediatek mt8186 soc (corsola). The latest
iso image for my laptop is the following one :

https://github.com/hexdump0815/imagebuilder/releases/download/230220-01/chromebook_snow-armv7l-bookworm.img.gz

but probably it uses a kernel that's too new. As you probably know,the
support of kvm for arm 32 (my arm chromebook is based on arm 32 bit) ended
with kernel 5.7. For this reason I've chosen the jammy iso image. Jammy
should be powered by the kernel 5.4,is that correct ?

regarding the conceptualization of what I need to do,correct me if I'm
wrong : I should chain u-boot that should be installed on the first
partition of the sd card,as explained here :

http://www.virtualopensystems.com/en/solutions/guides/kvm-on-chromebook/

with syslinux. If a chaining is possible,u-boot will call syslinux,which
will tell the kernel to start Jammy. That's the idea.

On Sat, Jul 1, 2023 at 7:29 PM Ralf Mardorf via ubuntu-users <
ubuntu-users at lists.ubuntu.com> wrote:

> On Sat, 2023-07-01 at 18:48 +0200, Mario Marietto wrote:
> > Inside the directory "extlinux",there is the file called extlinux.conf
> > What I want to know is which method he used to boot Ubuntu like this ?
> > I don't see grub.cfg and I don't see u-boot.
>
> Hi,
>
> I've got know knowledge related to this u-bootstrap thingy, but I'm a
> long time "syslinux" user who recently was forced to migrate to "grub".
>
> "extlinux" is part of upstream's "syslinux". It's a bootloader. "grub"
> is a bootloader too.
>
> Related to the menu's "FDT" entry and "u-boot", you probably should join
>
> the https://lists.zytor.com/syslinux
>
> and
>
> https://lists.denx.de/listinfo/u-boot mailing list.
>
> I can't comment on the u-boot mailing list, but I'm subscribed to the
> extlinux mailing list. If you post a request to this list, consider to
> do your homework first and also consider to post only requests related
> to this particular bootloader. The menu's "FDT" is new to me, it's
> obviously a distinctive feature to that special thing you want to do,
> that isn't related to Ubuntu:
>
> "230626-01 - experimental debian bookworm image for aarch64/arm64
> chromebooks based on the mediatek mt8186 soc (corsola) Latest
>
> this is just an experimental testing image to be able to get started
> with linux on this type of machines see [snip]
> no gpu support and other things might not work as well [snip]
> everything like that is done at your own risk and might break [snip]"
> - https://github.com/hexdump0815/imagebuilder/releases
>
> Regards,
> Ralf
>
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-- 
Mario.
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