[ipxe-devel] ipxe/seabios: segment register initialization

Michael Brown mcb30 at ipxe.org
Mon Feb 15 01:07:09 GMT 2016


On 14/02/16 19:52, Michael S. Tsirkin wrote:
> On Sun, Feb 14, 2016 at 05:36:38PM +0000, Michael Brown wrote:
>> On 14/02/16 15:53, Michael S. Tsirkin wrote:
>>> do you think %DS should be zeroed when NBP is called then?
>>
>> Not according to the PXE spec.
>>
>> As far as I can tell, the initial value of %ds is undefined for both a PXE
>> NBP and a BIOS boot sector.
>
> Thanks,

Out of interest: did this question arise as a purely academic curiosity, 
or is there some product in existence which creates a boot sector that 
relies on %ds==0?

Michael


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