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

[Kevin O'Connor]

On Fri, Dec 04, 2009 at 01:24:52AM +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 on the ISA PC.
> 
> Signed-off-by: Alexander Graf <address@hidden>

Thanks Alexander.

Why not always map the f-segment as ram?  On a PCI machine, both bochs
bios and seabios will make it read-only at the end of POST regardless
of how it started.

-Kevin