[OpenBIOS] Solaris anyone?

[Blue Swirl]

On Wed, Apr 27, 2011 at 10:29 PM, Mark Cave-Ayland
<mark.cave-ayland at siriusit.co.uk> wrote:
> On 27/04/11 17:31, Artyom Tarasenko wrote:
>
>> After a bit experimenting it turend out that I was wrong about
>> synchronous. This seems to be the problem.
>> The comment in the OpenSolaris esp driver
>>
>> http://src.opensolaris.org/source/xref/xen-gate/onnv-3.4/usr/src/uts/sun/io/scsi/adapters/esp.c#3463
>> also explains one reason why:
>>
>> /*
>> * Set up to send synch. negotiating message.  This is getting
>> * a bit tricky as we dma out the identify message and
>>  * send the other messages via the fifo buffer.
>> */
>>
>> Looks like the qemu esp doesn't support mixing dma/fifo messages.
>
> (cut)
>
>> This seems to be necessary too because the OpenSolaris driver seems to
>> use at least two tags:
>>
>> esp->e_cur_msgout[i++] = sp->cmd_tag[0];
>> esp->e_cur_msgout[i++] = sp->cmd_tag[1];
>
> Nice detective work! Is a fix for this particularly easy to create, or would
> my patch be the best short term fix?

Maybe ESP could be modified so that a DMA operation would just push
the data to FIFO, this is probably what happens in a real ESP. But I'd
just use your patch for now.