[syslinux] Using syslinux on the PMBR of a GPT partition table

[H. Peter Anvin]

Stewart Adam wrote:
> Hi,
> 
> I've been working on making a USB key which is bootable via EFI and 
> BIOS, and so far I've succeeded but only by using GRUB on the MBR. 
> Syslinux installs correctly, but because the USB key can only have one 
> partition and its type is EFI protective, it isn't set to bootable on 
> the MBR partition table and so syslinux (mbr.bin) doesn't boot. I've 
> also tried gptmbr.bin which semi-works -- I don't get "missing operating 
> system" as I do with mbr.bin, but the OS doesn't actually load either. 
> My BIOS just reads the USB key a bit and then gets stuck.
> 
> I was wondering what was the status of syslinux and GPT, and was 
> wondering what testing I could do to help improve hybrid GPT+MBR support.
> 

gptmbr.bin needs the UUID of the boot partition written to the MBR; I
really should write a script to do that.

That doesn't mean gptmbr.bin has been extensively tested by any means;
yours is the first report of someone actually trying to use it.  We
obviously should try to make it work.

Could you describe your setup a bit?

	-hpa