Re: MULTIBOOT fails w/ GRUB2 and SYS/EXTLINUX

[Benny Siegert <bsiegert%gmail.com@localhost>]

I think that GRUB2 has a special module and command to load NetBSD kernels:

knetbsd /netbsd root=/dev/wd0e


On Tue, Mar 12, 2019 at 10:37 AM pierre-philipp braun
<pbraun%nethence.com@localhost> wrote:
>
> Yolo again
>
> this message closely relates to my two previous ones -- on bootstrapping netbsd from an ext2fs manually -- and I am now  and finally considering MULTIBOOT.
>
> Although I have seen some success reports with GRUB2 *1, all I get is failures.  With GRUB2/multiboot and multiboot2 I get
>
>         error: no multiboot header found.
>
> The GRUB2 configurations I tried:
>
> menuentry 'multiboot netbsd' {
>                 insmod ext2
>                 set root='(hd0,msdos1)'
>                 multiboot /netbsd root=/dev/wd0e
>         }
>
>         menuentry 'multiboot2 netbsd' {
>                 insmod ext2
>                 insmod multiboot2
>                 set root='(hd0,msdos1)'
>                 multiboot2 /netbsd root=/dev/wd0e
>         }
>
> Although it is supposedly the default now, I even tried with a custom kernel (`options MULTIBOOT`).
>
> Note GRUB2 offers some tweaks to workaround things *1.  No change there either.
>
> Now with SYS/EXTLINUX, I get something similar
>
>         Invalid Multiboot image: neither ELF header nor a.out kludge found
>
> How get the boot strapping process to load the netbsd kernel fine using multiboot?
>
> I remember I was able to load XEN+NetBSD with the GRUB `kernel` and `module` parameters before, and I believe this was doing MULTIBOOT already.  But maybe that was GRUB legacy.
>
> Thanks
> *1 https://mail-index.netbsd.org/tech-kern/2011/09/13/msg011481.html
> *2 https://www.gnu.org/software/grub/manual/grub/grub.html#multiboot
> --
> Pierre-Philipp Braun
> SNE Russia https://os3.su/



-- 
Benny