[Qemu-devel] Re: [PATCH v2] [0.12] Map BIOS f-segment as RAM, not as ROM

[Kevin O'Connor]

On Fri, Dec 04, 2009 at 11:33:13AM +0100, Alexander Graf wrote:
> SeaBIOS needs to write to the f-segment. So it needs to have some way to set
> that from read-only to read-write, write in it and when it's done set it to
> read-only again.
> 
> On PCI we have a mechanism for that. The ISA machine does not though. To stay
> regression free and happily enable users to continue using the -M isapc 
> machine
> let's just map it as RAM. The BIOS on PCI will set it to r/o later either way.

Thanks Alexander.

With this qemu patch, SeaBIOS still wouldn't boot from a harddrive
because it only probed PCI ATA controllers.  I committed 4ccb2312 to
SeaBIOS to have it probe for ISA ATA controllers when no pci devices
are found.

-Kevin