[coreboot] GRUB2 is not displaying Hard disk (hd0) partition

[Dhanasekar Jaganathan]

Hi Nico,

>You can get used to the (ahci*) numbering, or in case you need to sup-
>port both schemes with the same config file: My default `grub.cfg`
>generated by grub-mkconfig works around these differences with the
>`search` command (see `info grub search`). For instance, it can set the
>`root` variable to a partition found by its filesystem's UUID, e.g.:

>    search --no-floppy --fs-uuid --set=root
>ad4103fa-d940-47ca-8506-301d8071d467

Actually, I am installing ONIE through GRUB2.  As per your suggestion, I
have changed all* (hd0)* to* (ahci4)* in ONIE's grub.cfg. Still, GRUB2 is
not finding (automatically) grub.cfg.
By default, *"memdisk"* is set to root. But I expect *"ahci"* should be
default root.

How to change gurb's default root to "ahci"?.

Please provide your comments.

Thanks,
Dhanasekar

On Thu, Jul 6, 2017 at 2:45 AM, Nico Huber <nico.h at gmx.de> wrote:

> Hi Dhanasekar,
>
> On 05.07.2017 16:23, Dhanasekar Jaganathan wrote:
> > Hi All,
> >
> > In GRUB2 command prompt, I am not seeing hard disk partitions like
> *(hd0),
> > (hd0,msdos1),* Instead I am seeing* (ahci4), (ahci4,msdos1).*
>
> the (hd*) numbering refers to those disks the BIOS has enumerated and
> provides drivers for. You'd see them like this when you use SeaBIOS and
> let it load a GRUB built for i386-pc.
>
> >
> > Usually, GRUB2 will list all the drives that coreboot presents to it. I
> > think coreboot presenting drives in "AHCI" (not in "hd) format. So that
> > GRUB2 displaying drives in AHCI format.
>
> With GRUB as payload (I suppose that's your case), there is no BIOS that
> presents disks and coreboot doesn't do such thing. So GRUB does what an
> OS would do, load an AHCI driver and probe the disks by itself.
>
> >
> > Correct me, If I am wrong.
> >
> > Is there any changes to do in menuconfig?
> > Can you please help me to solve this issue?.
> > Please provide your comments.
>
> You can get used to the (ahci*) numbering, or in case you need to sup-
> port both schemes with the same config file: My default `grub.cfg`
> generated by grub-mkconfig works around these differences with the
> `search` command (see `info grub search`). For instance, it can set the
> `root` variable to a partition found by its filesystem's UUID, e.g.:
>
>     search --no-floppy --fs-uuid --set=root
> ad4103fa-d940-47ca-8506-301d8071d467
>
> Hope that helps,
> Nico
>
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