[syslinux] PXE boot img for both BIOS and EFI

[Joakim Tjernlund]

On Tue, 2018-12-18 at 14:10 -0500, Gene Cumm wrote:
> On Wed, Dec 12, 2018 at 6:30 PM Joakim Tjernlund via Syslinux
> <syslinux at zytor.com> wrote:
> > On Wed, 2018-12-12 at 17:10 -0600, Carl Karsten wrote:
> > > CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe.
> > > 
> > > 
> > > On Wed, Dec 12, 2018 at 4:54 PM Joakim Tjernlund
> > > <Joakim.Tjernlund at infinera.com> wrote:
> > > 
> > > > While I am here, I want to ask:
> > > > Is there a way to create a combined PXE boot img for both BIOS and EFI ?
> > > > Currently one have to use 2 different images.
> > > 
> > > I'm a little fuzzy what you mean here.
> > 
> > Can you have one pxelinux.0 which will work for both UEFI resp. BIOS PXE ?
> 
> BIOS PXE always enters execution at the first byte. UEFI uses a PE32+
> image format.  The PE32 header starts with the string "MZ" which
> doesn't bode well for this idea.
> 

Yes, that seems a bit difficult.

What about booting syslinx from GRUB2 UEFI ?
that is instead of PXE boot from BIOS I want grub to start some syslinux binary that
continues behaves like PXE boot.
I want to automatise the PXE boot so I can initiate one by rebooting into GRUB go from there

 Jocke