On Mon, Feb 15, 2016 at 08:43:18AM +0200, Michael S. Tsirkin wrote:
> On Mon, Feb 15, 2016 at 01:07:09AM +, Michael Brown wrote:
> > On 14/02/16 19:52, Michael S. Tsirkin wrote:
> > >On Sun, Feb 14, 2016 at 05:36:38PM +, Michael Brown wrote:
> > >>On 14/02/16 15:53, Michael S. Tsirkin wrote
On Mon, Feb 15, 2016 at 01:07:09AM +, Michael Brown wrote:
> On 14/02/16 19:52, Michael S. Tsirkin wrote:
> >On Sun, Feb 14, 2016 at 05:36:38PM +, 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?
> >>
> >>N
On 14/02/16 19:52, Michael S. Tsirkin wrote:
On Sun, Feb 14, 2016 at 05:36:38PM +, 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
On Sun, Feb 14, 2016 at 05:36:38PM +, Michael Brown wrote:
> On 14/02/16 15:53, Michael S. Tsirkin wrote:
> >>That's for execution of a PXE NBP, rather than a (SAN-booted) disk boot
> >>sector.
> >
> >I actually thought the initial post was about iPXE calling NBP (starting
> >at location 07C00h
On 14/02/16 15:53, Michael S. Tsirkin wrote:
That's for execution of a PXE NBP, rather than a (SAN-booted) disk boot
sector.
I actually thought the initial post was about iPXE calling NBP (starting
at location 07C00h) with a non-zero DS, not about booting from disk.
The initial post mentioned
On Sun, Feb 14, 2016 at 03:40:51PM +, Michael Brown wrote:
> On 14/02/16 15:26, Michael S. Tsirkin wrote:
> >>I'm not aware of any standard describing the content of %ds when jumping to
> >>a boot sector at :7c00. Every boot sector that I have encountered
> >>explicitly initialises %ds (an
On 14/02/16 15:26, Michael S. Tsirkin wrote:
I'm not aware of any standard describing the content of %ds when jumping to
a boot sector at :7c00. Every boot sector that I have encountered
explicitly initialises %ds (and %es, and %ss:%sp) to known values.
Sounds reasonable wrt %ds, but I th
On Sun, Feb 14, 2016 at 12:41:31PM +, Michael Brown wrote:
> On 14/02/16 10:52, Victor Kaplansky wrote:
> >I've created a boot-sector which works just fine when loaded
> >directly from BIOS, but doesn't work when loaded by ipxe:
> >
> >0: b8 ad demovax,0xdead
>
Hi,
I've created a boot-sector which works just fine when loaded
directly from BIOS, but doesn't work when loaded by ipxe:
0: b8 ad demovax,0xdead
3: a3 10 7cmovds:0x7c10,ax
0xdead is not written to :7c10.
The reason is that BI
On 14/02/16 10:52, Victor Kaplansky wrote:
I've created a boot-sector which works just fine when loaded
directly from BIOS, but doesn't work when loaded by ipxe:
0: b8 ad demovax,0xdead
3: a3 10 7cmovds:0x7c10,ax
0xdead is not
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