[SeaBIOS] [PATCH] If an int 1587 call is made from an option rom, stay in bigreal mode.
kevin at koconnor.net
Sun Apr 20 15:37:19 CEST 2014
On Sun, Apr 20, 2014 at 01:16:29AM +0200, Paul Menzel wrote:
> Am Samstag, den 19.04.2014, 12:30 -0400 schrieb Kevin O'Connor:
> > Modify the int 1587 handler to check if the POST phase is still
> > running. If it is, use bigreal mode segment limits so that the caller
> > remains in bigreal mode when the 1587 handler completes. This helps
> > with SeaVGABIOS' use of "direct" framebuffer accesses (an option rom
> > may attempt to display text during its option rom execution which can
> > cause SeaVGABIOS to make the int 1587 calls).
> Did you experience this or is that just a precaution? If you did
> experience this, could you please elaborate what hardware you used and
> which Option ROMs were executed?
Gerd reported the problem at:
This was experienced on QEMU with iPXE. The problem is generic enough
that it could occur on any hardware and with any option rom that
writes to the screen.
More information about the SeaBIOS