[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] Re: [PATCH] [0.12] Map BIOS f-segment as RAM, not as ROM
From: |
Kevin O'Connor |
Subject: |
[Qemu-devel] Re: [PATCH] [0.12] Map BIOS f-segment as RAM, not as ROM |
Date: |
Thu, 3 Dec 2009 19:44:39 -0500 |
User-agent: |
Mutt/1.5.19 (2009-01-05) |
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