RE: Cannot boot from dual bios/uefi boot CD

[John Frankish]

> > > > I ran the following:
> > > > 
> > > > $ sudo x86_64-grub-mkrescue --modules="iso9660 fshelp loadbios 
> > > > part_msdos part_gpt normal terminal crypto extcmd boot gettext 
> > > > linux video relocator mmap font bufio efi_gop video_fb efi_uga 
> > > > gfxterm bitmap_scale bitmap gfxmenu trig" -o myiso.iso iso
> > > > 
> > > > The iso as-is boots, but still contains copies all of the modules in 
> > > > i386pc and x86_64-efi.
> > > >
> > > > I don't see the logic in embedding modules if the same modules will be 
> > > > copied to the iso anyway?
> > > > 
> > > > If I delete the x86_64-efi folder from the iso, it doesn't boot and 
> > > > complains about all of the missing modules for ever.
> > >
> > > And which modules are missing? This works for me
> > >
> > > address@hidden:~/build/grub> pkgdatadir=$PWD ./grub-mkrescue -d 
> > > grub-core -o /tmp/foo.iso --modules="linux part_msdos minicmd ls" 
> > > --install-modules="" /linux=/boot/vmlinuz-3.16.7-7-desktop 
> > > /initrd=/boot/initrd-3.16.7-7-desktop
> > >
> > > linux /linux
> > > initrd /initrd
> > > boot
> > >
> > > minicmd is for lsmod and ls is for ls. part_msdos is not really needed.
> > > It still works using minimal --modules=linux
> > 
> > Thanks for the continued help with this.
> > 
> > I was using grub-2.00, which doesn't have "-d" or "--install-modules="
> > 
> > If I use grub-2.02~beta2, then the same command works for me, except that 
> > I'm booting to the console prompt so in uefi
> > boot I get a blank display after "error: no suitable video more found. 
> > Booting in blind mode".
> 
>
> Yes, on BIOS linux depends on and automatically pulls in vbe. The following 
> works for me on EFI
> (for booting from ISO image of course)
>
> address@hidden:~/build/grub> pkgdatadir=$PWD ./grub-mkrescue -d grub-core -o 
> /tmp/foo.iso --modules="linux minicmd
> ls efi_gop" --install-modules="" /linux=/boot/vmlinuz-3.16.7-7-desktop 
> /initrd=/boot/initrd-3.16.7-7-desktop
>
> > BTW, if I use --modules="linux" or --modules="linux part_dos iso9660", then 
> > uefi boot fails with the error:
> > file `/boot/grub/x86_64-efi/part_acorn.mod` not found. Entering rescue mode.
>
> See above. It works for me using EFI build. And the following allows me to 
> boot from HDD:
>
> address@hidden:~/build/grub> pkgdatadir=$PWD ./grub-mkrescue -d grub-core -o 
> /tmp/foo.iso
> --modules="linux minicmd ls efi_gop ext2" --install-modules=""
>
> Adjust for your filesystem. You may need to add part_msdos and part_gpt 
> (current GIT head does it automatically on EFI).

[all of this was done with grub built from git as of two days ago]

As you can see above that's what I did, I'm booting from CD into RAM.

--modules="linux part_msdos minicmd ls" works
--modules="linux" gives error part_acorn.mod not found
--modules="linux part_dos iso9660" gives error part_acorn.mod not found

>
> This means your grub-mkrescue sees only i386-pc platform. loadbios.mod exists 
> in EFI build only.
>

I don't think that's the case, I have:

/usr/local/lib/grub/i386-pc/*modules
/usr/local/lib/grub/x86_64-efi/*modules

..and since --modules="linux part_msdos minicmd ls" works for both legacy-bios 
and uefi boot, grub sees both sets of modules

For me, grub-mkrescue should understand that I need certain modules for uefi 
only, otherwise how am I going to get an efi-fb display in uefi boot when the 
same modules don't exist for legacy-bios?

> > ..so it appears that I'm stuck?
> > 
>
> If your intention is to build dual-platform support, you probably 
> misunderstood what I said earlier. You need to build and
> install grub twice for two different platforms USING THE SAME PREFIX AND 
> PROGRAM NAME. It appears you built it
> twice but placed in two different locations, so you can now only use one of 
> them at a time.

No, that's not the case, both are under /usr/local:

/usr/local/lib/grub/i386-pc/*modules
/usr/local/lib/grub/x86_64-efi/*modules

> You should have something like
>
> address@hidden:~/src/grub> LC_ALL=C ll /usr/lib/grub2 total 40 drwxr-xr-x 2 
> root root 20480 Nov  8 07:54 i386-pc drwxr-xr-x > 2 root root 20480 Nov  8 
> 08:05 x86_64-efi
>
> Now replace /usr/lib with /usr/local/lib, i.e. you have to build and install 
> twice using
>
>./configure --prefix=/usr/local --with-platform=pc ./configure 
>--prefix=/usr/local --with-platform=efi
>

As per above, that's exactly what I did

> > Note also that, the mkrescue command appears to copy files all  over the 
> > place:
> > 
> > $ ls /mnt/sr0/boot/grub/x86_64-efi [why is this required if the modules are 
> > embedded?]
> > command.lst   crypto.lst    fs.lst        moddep.lst    modinfo.sh    
> > partmap.lst   parttool.lst  terminal.lst  video.lst
> > 
> > $ ls /mnt/sr0/System/Library/CoreServices
> > SystemVersion.plist  boot.efi [is boot.efi duplicating efi.img?]
> > 
> > $ ls /mnt/sr0
> > System/       boot/         boot.catalog  efi.img       mach_kernel
> > 
> > ..and copies Unicode.pf2 to the cd when it cannot be used and creates empty 
> > directories for locale and rom.
> >