Kevin O'Connor wrote:
On Thu, May 05, 2011 at 12:53:36AM +0200, Sebastian Herbszt wrote:
Kevin O'Connor wrote:
>On Tue, May 03, 2011 at 11:38:45PM +0200, Sebastian Herbszt wrote:
>>SeaBIOS doesn't seem to call non-PNP legacy option roms and handles
>>them like BCV. I think this behaviour is incorrect because non-PNP
>>legacy option roms should get called without exceptions.
>
>SeaBIOS calls all non-PNP option roms unconditionally. It places them
>in the "BootList" so that it can order their invocation relative to
>PNP option roms. This is the recommendation of the BBS spec - the
>idea is that many legacy option roms hook the C: drive - so ordering
>their invocation allows a PNP drive to hook the C: drive first.
Got a pointer in the BBS spec?
Section 5.2.3:
--------
5.2.3 Legacy Cards with Option ROMs
The third type of entry in the BCV Table is all Legacy cards with
option ROMs. A Legacy card will install its INT 13h drive support when
the BIOS calls the Legacy card's initialization vector. No attempt is
made to enumerate or control the installation order of individual
devices, although nothing defined in this specification prevents this.
--------
Sections 5.3 and 5.4 go into further detail.
Chapter 6 describes the POST sequence:
- Initializing BAIDs, PnP Boot Devices
- PnP Option ROM Initialization
- INT 13h Device Controller Installation (BCV, Legacy ROM Scan, On-board ATA
Support)
- IPL processing
So by the time the boot menu is displayed all BCVs and legacy roms should have
already been called.
This doesn't seem to be currently true for legacy roms. PnP roms are called but
legacy roms are not. They
are only called if they are selected from the boot menu.
Sebastian
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