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From: Blue Swirl <blauwirbel@gmail.com>
Date: Tue, 1 Sep 2009 20:11:50 +0300
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Subject: [Qemu-devel] Re: sparc esp dma endianness [patch-rfc]
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To: Artyom Tarasenko <atar4qemu@googlemail.com>
Cc: qemu-devel <qemu-devel@nongnu.org>

On Tue, Sep 1, 2009 at 8:08 PM, Artyom
Tarasenko<atar4qemu@googlemail.com> wrote:
> 2009/9/1 Blue Swirl <blauwirbel@gmail.com>:
>> Usually the first byte is bus id. What if you changed (as a hack) here:
>> =C2=A0 =C2=A0DPRINTF("do_cmd: busid 0x%x\n", buf[0]);
>> =C2=A0 =C2=A0lun =3D buf[0] & 7;
>> =C2=A0 =C2=A0datalen =3D s->current_dev->send_command(s->current_dev, 0,=
 &buf[1], lun);
>> &buf[1] to &buf[0]?
>
> Yep, figured that out too, but did a little more complex hack:
>
> lun =3D buf[1] >>5;
> datalen =3D s->current_dev->send_command(s->current_dev, 0, &buf[0], lun)=
;
>
> with this hack OBP checks proper LUNs.
>
> So, the problem is not endianness, but the missing bus id. But how the
> bus id should get into the dma buffer?
> It should be generated by esp, right?
>

It could be pushed into FIFO with PIO.