[SeaBIOS] [PATCH] fix two issues with virtio-blk

Sebastian Herbszt herbszt at gmx.de
Sun May 16 17:56:27 CEST 2010


Kevin O'Connor wrote:
> On Sun, May 16, 2010 at 02:59:19PM +0200, Sebastian Herbszt wrote:
>> Kevin O'Connor wrote:
>> >On Sat, May 15, 2010 at 10:08:54PM +0200, Sebastian Herbszt wrote:
>> >>with CDROM support. Sure you can grab another 4 KB for a RMW buffer,
>> >It's only 2KB more - the buffer could be shared.
>> Even if you want to be able to copy from CDROM emulation to a disk with 4 KB
>> physical sectors? I assume you need 2 KB for CDROM emulation and 4 KB for RMW.
> 
> There is no "copy" BIOS command.  To copy data, the caller must read a
> sector into memory and then write the sector from its memory to the
> new disk.  Both read and write BIOS operations can use the same 4KB
> buffer.

Oops - you are right. My bad.

Sebastian




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