RE: Cannot boot from dual bios/uefi boot CD

[John Frankish]

> >> > On Wed, Jan 28, 2015 at 10:30 AM, John Frankish
<address@hidden> wrote:
> >> > Hi,
> >> >
> >> > I'm trying the create a dual bios/uefi boot iso to burn to CD/DVD 
> >> > and boot both bios and uefi.
> >> >
> >> And your grub version is?
> >>
> > 2.00
> >
> Current is 2.02~beta2.
>
> >> > The bios boot works fine
> >> > On two different machines, the uefi boot gets to the grub menu list:
> >> >
> >> > On a dell laptop choosing the grub menu item boots to the linux 
> >> > console prompt, but will not accept any keyboard input On a mac 
> >> > mini the boot hangs without error message after choosing the grub
menu
> >> > item.
> >> >
> >> > Note that in both cases, I can enter grub commands from the prompt 
> >> > and can also edit the grub menu entries.
> >>
> >> And it boots after that?
> >
> > No, on the laptop it boots to the console prompt, but does not accept 
> > keyboard input
> >
> >> >  In addition, both the bios and uefi boot are using the same 
> >> > vmlinuz and initrd files.
> >> > Finally a more standard uefi installation to usb stick boots on 
> >> > both machines without problems.
> >> >
> >>
> >> I'm afraid I do not quite understand that. Could you be more verbose
> >>
> >> - what "standard uefi installation to usb stick" means?
> > The grub modules are in /EFI/BOOT/grub/X86_64 rather than embedded in 
> > BOOTX64.EFI
> >
>
> Any reason you need to build your own image in the first place? And if
yes, what is the reason to include ata, ahci and all USB drivers?
> Please build image without them (i.e. ahci ata ehci ohci uhci usb_keyboard
- hopefully I did not miss something).

The reason is that I thought from google that was how things had to be done
for a dual bios/uefi CD/DVD boot. I included the USB drivers because on both
the dell laptop and the mac mini the CD/DVD drive is an external USB one.

Are you saying I should create an efiboot.img containing a minimal
BOOTX64.EFI (if so, what counts as minimal?) and the usual grub modules
under /EFI/BOOT/grub/X86_64 instead of embedding them in BOOTX64.EFI?

> >> >
> >> > $ x86_64-grub-mkimage --format=x86_64-efi --output=BOOTX64.EFI 
> >> > --prefix=/EFI/BOOT/grub --config=/tmp/grub.cfg acpi ahci all_video 
> >> > appleldr at_keyboard bitmap_scale ata boot cat chain configfile 
> >> > cs5536 echo efi_gop efi_uga ehci ext2 fat font gfxmenu gfxterm gzio 
> >> > halt help hfs hfsplus iso9660 jpeg keylayouts linux loadbios 
> >> > loadenv ls minicmd normal ohci
> >> > part_gpt part_msdos png probe regexp reboot search search_fs_file 
> >> > search_fs_uuid search_label test tga true udf ufs1 ufs2 uhci 
> >> > usb_keyboard zfs.
> >> >