Re: [Xen-devel] [PATCH OSSTEST v2 07/19] Enable chain loading to local disk for UEFI PXE systems.

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Thu, 2015-06-18 at 18:52 +0100, Ian Jackson wrote:
> Ian Campbell writes ("[PATCH OSSTEST v2 07/19] Enable chain loading to local 
> disk for UEFI PXE systems."):
> > First arrange for bootloader to be installed to removable media path,
> > by using a new in Jessie preseed option. Then use that to chainload a
> > bootloader from the disk.
> 
> The `removable media path' is a UEFI path that refers to part of the
> fixed disk drive ?

Yes, it is the UEFI standardized path (per arch) to an EFI executable
which the firmware can/should boot by default when told to boot from a
removable device (CD, USB stick, etc). (AIUI, etc). Somewhat like the
UEFI equivalent of a stage 1 bootloader in the MBR on a floppy or
something.

It's a fairly common BIOS bug to default to using this path (rather than
the data base of boot options) for non-removable disks too, which is why
Jessie gained an option to install a bootloader there too. Which was
serendipitous for us here...

Ian.


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