[coreboot] Exact status of gPXE support?
peter at stuge.se
Thu Oct 2 14:26:31 CEST 2008
Mats Erik Andersson wrote:
> To what extent does gPXE presently interface "well" with Coreboot?
Very little. Without the work as outlined by Chris gPXE does not
function as a payload at all. Etherboot works just fine however.
> Is the position identical for coreboot-v2 and coreboot-v3?
> 1. Is there an available and ready interface in Coreboot
> that allows the detection of an PXE-ROM image inside
> an PCI ethernet card adapter?
If by PXE-ROM you mean option ROM then yes, coreboot scans for
> Can execution be transferred to a copy of that code segment?
No, if option ROMs are executed they are executed in emulated real
mode. Either in VM8086 mode, or using x86emu.
> 2. Is it known whether a "slimmed down" gPXE can be built and
> incorporated into a Coreboot image under the lesser demand
> that the purpose of the gPXE code is only that of getting
> and running the executable "pxelinux.0", fetched from another
> server, thus making the system autonomous?
This is not possible.
> There could possibly exist some code segment in PXElinux that
> depends on either 16-bit mode, or lagacy Bios calls, but I do
> not a priori know that with any certainty!
Yes, PXE requires real mode and BIOS interrupt services.
But all network booting is not PXE. PXE is just a standard with a
limited subset of what Etherboot and gPXE can do. They can both
simply use DHCP+TFTP to boot a system, and that will work just fine
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