[SeaBIOS] non-emulated AHCI hardware

[Kevin O'Connor]

On Tue, Apr 26, 2011 at 09:15:04PM -0500, Scott Duplichan wrote:
> Kevin O'Connor wrote:
> ]Out of curiosity, can you see what happens if you return
> ]DISK_RET_EBOUNDARY in the unaligned case?
> 
> DOS tries the same request 10 times then ignores the error
> and continues.

Thanks for testing.

> ]It's not currently possible to dynamically allocate memory during
> ]runtime.  However, it is possible to allocate a buffer at init and
> ]keep it around for later.  How big of a buffer would you need?
> 
> I think a single aligned 512 byte buffer would do. The code could
> read a sector at a time and memcpy from the seabios aligned buffer
> into the caller's unaligned buffer.

Yeah.  One can call malloc_low() during the init phase to allocate
this buffer.  Ideally, though, there would be some way to share buffer
space with the other users (eg, cdemu, ide dma, usb).

-Kevin