Re: Cannot boot from dual bios/uefi boot CD

[Andrei Borzenkov]

В Sat, 31 Jan 2015 11:21:51 +0400
John Frankish <address@hidden> пишет:

> > >> >> >> > 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.
> > >
> > > I tried 2.02~beta2 and no matter what I do, I end up at the grub 
> > > prompt with the message:
> > >
> > > Error: no server is specified
> > >
> > > ..seems like a bug?
> > >
> >
> > It is hard to tell without seeing your exact prefix and embedded config.
> > "No server specified" sounds like something related to network which could 
> > be if you include networking drivers ...
> >
> > Which is one of reason why grub-mkrescue is recommended - we know what it 
> > does :)
> 
> I've gone back to grub 2.00 since that seems to almost work.
> 
> > >> >> >> > The bios boot works fine
> > >> >> >> > On two different machines, the uefi boot gets to the grub menu 
> > >> >> >> > list:
> > >>
> > >> I say that you should be using grub-mkrescue command. This is  supported
> > > > tool to build bootable standalone hybrid ISO image that can > be used 
> > > > to boot both from CD as well as USB (although to boot from USB in case 
> > > > of EFI you probably need recent fix). This command > > builds correct 
> > > > image and allows you to add arbitrary files to it, including grub.cfg, 
> > > > kernels and such. It needs xorrisofs and in case of EFI > - mtools 
> > > > (mformat/mcopy).
> > >>
> > > OK, but I'm trying to make an iso that is bootable both by legacy BIOS 
> > > and UEFI, the above doesn't sound like it will do this?
> > >
> >
> > grub-mkrescue creates ISO that is bootable by all platforms for which grub 
> > support is installed. If your system has grub for i386-pc and > x86_64-efi 
> > (and may be i386-efi) installed under standard directory, grub-mkrescue 
> > will build ISO that includes support for all three
> > and is bootable on all three platforms. If not, this is a bug. Which is one 
> > more reason to use it :)
> >
> > Normally grub boot time code is located under /usr/lib/grub or 
> > /usr/lib/grub2. It should have subdirectories /usr/lib/grub/i386-pc etc. > 
> > If you build grub yourself, you need to build and install it two or three 
> > times for each individual platform.
> >
> > If you are using grub from your distribuion, it should have packets for 
> > each one (at least those I know have).
> 
> It is not sure that all users of the iso would have grub installed hence 
> grub-mkrescue would not work
> 

Users of ISO do not need to have grub installed at all. ISO created by
grub-mkrescue is self contained.

> I tried again without gfxterm and the result seems to be the same - I get "no 
> suitable video mode found. Booting  in blind mode", but grub sounds to be 
> booting the kernel and initrd.
> 
> So, with and without gfxterm, grub boots the kernel and initrd from the CD, 
> but does not appear to hand control to the OS at the end of booting.
> 
> At the moment, various grub modules and a simple grub.cfg are embedded in 
> BOOTX64.EFI, which is in turn copied into efiboot.img, which is loaded from 
> the CD at /EFI/BOOT/efiboot.img by my laptop UEFI BIOS.
> 
> Do any more grub files need to be present on the CD? I've tried with and 
> without an additional grub.cfg on the CD at /EFI/BOOT/grub/grub.cgf and fonts 
> at /EFI/BOOT/grub/fonts/unicode.pf2 
> 
> It feels like this is almost working, but I'm missing something...
>