[gPXE] abortpxe.com and gpxe issue

[H. Peter Anvin]

On 08/24/2010 12:16 AM, Joshua Oreman wrote:
> On Tue, Aug 24, 2010 at 12:03 AM, Arends, R.R. <r.r.arends at hro.nl> wrote:
>> I was reading along and had a wds server here with the abortpxe.com
>> Not sure what exactly it contains.. Thats goes behond my scope.
>>
>> But i have putted the file online. [1]
>>
>> file reports just "data".
>>
>> $ file abortpxe.com
>> abortpxe.com: data
>>
>> [1] http://med.hro.nl/arerr/gpxe/abortpxe.com
> 
> Thanks! I disassembled it; it's a very simple little program. It
> prints the string "PXE Boot aborted. Booting to next device..." using
> int 10h and then returns with 0x1 in %ax.
> 
> gPXE currently ignores the return value of the NBP, so at first glance
> it would make sense that this doesn't work for us. But we do
> definitely return to the BIOS for booting the next device if we get
> control back from the booted program, and the looping behavior seems
> very odd. Viswanath, exactly what output do you get from gPXE when
> this breaks?
> 

Exiting with 1 should be the same as exiting with 0.  Only 4 and 5 are
special.

On the other hand, perhaps that means we should tell peopel over in the
Syslinux areas who have problems to try "localboot 1" instead...

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.