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From: Artyom Tarasenko <atar4qemu@googlemail.com>
Date: Tue, 1 Sep 2009 19:08:00 +0200
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Subject: [Qemu-devel] Re: sparc esp dma endianness [patch-rfc]
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To: Blue Swirl <blauwirbel@gmail.com>
Cc: qemu-devel <qemu-devel@nongnu.org>

2009/9/1 Blue Swirl <blauwirbel@gmail.com>:
> Usually the first byte is bus id. What if you changed (as a hack) here:
> =A0 =A0DPRINTF("do_cmd: busid 0x%x\n", buf[0]);
> =A0 =A0lun =3D buf[0] & 7;
> =A0 =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?