Re: Cannot boot from dual bios/uefi boot CD

[Andrei Borzenkov]

В Sun, 1 Feb 2015 11:21:23 +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.
> > > > 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 :)
> > > >
> How do I compile grub for both efi and i386-pc?
> 
> It seems like I can have --platform-efi or --platform=pc (and 
> --target=x86_64), but not both?
> 

You can't build two platforms at the same time. Build two times and
install under common prefix, like

./configure --prefix=/usr/local/grub-test --with-platform=efi
make ; make install ; make distclean
./configure --prefix=/usr/local/grub-test --with-platform=pc
make ; make install
/usr/local/grub-test/bin/grub-mkrescue ...

May be we should extend grub-mkrescue to take a list of directories so
it could build multi-platform image directly.