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Date:      Fri, 18 Sep 2015 07:59:46 +0100
From:      Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
To:        Alexey Dokuchaev <danfe@FreeBSD.org>,  Marius Strobl <marius@alchemy.franken.de>
Cc:        "freebsd-sparc64@freebsd.org" <freebsd-sparc64@freebsd.org>
Subject:   Re: PCI range checking under qemu-system-sparc64
Message-ID:  <55FBB662.4080708@ilande.co.uk>
In-Reply-To: <20150917082817.GA71811@FreeBSD.org>
References:  <20150906124859.GA14919@FreeBSD.org> <20150907203152.GA70457@alchemy.franken.de> <55EDFE00.9090109@ilande.co.uk> <20150913022143.GA7862@alchemy.franken.de> <20150913103940.GA60101@FreeBSD.org> <20150913180126.GC7862@alchemy.franken.de> <55F89861.1030107@ilande.co.uk> <20150916031030.GA6711@FreeBSD.org> <55F9C2B8.7030605@ilande.co.uk> <20150916211914.GD18789@alchemy.franken.de> <20150917082817.GA71811@FreeBSD.org>

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On 17/09/15 09:28, Alexey Dokuchaev wrote:

> On Wed, Sep 16, 2015 at 11:19:15PM +0200, Marius Strobl wrote:
>> [...]
>> Which suggest that the next thing to investigate is the CMD646
>> emulation. Is there a particular reason why QEMU emulates a
>> CMD646U rather than a plain CMD646 as found in the real sun4u
>> machines of the USIIe/i era?
>>
>> Alexey, does building the port with CDROM_DMA disabled make
>> a difference?
> 
> Ironically I had it already disabled prior to your question; but I've
> rebuilt the port enabling it for completeness' sake.  It did not make
> a difference.
> 
> Then I've disabled all CAM/ATA stuff (scbus, ata, umass, etc.) in the
> kernel config and that's what I see now (this is with CDROM_DMA=on):

What does the CAM/ATA stuff do here? Does this mean it may not
necessarily be an interrupt issue if you can get to mounting the root fs
with CDROM_DMA=on?


ATB,

Mark.




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