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

[Alexander Graf]

On 04.12.2009, at 01:44, Kevin O'Connor wrote:

> 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.

I merely wanted to fix the regression. If you think it's a good idea to always 
map it R/W, I'll gladly change the patch.

Alex