From: David Miller <davem@davemloft.net>
To: mroos@linux.ee
Cc: sparclinux@vger.kernel.org, linux-pci@vger.kernel.org
Subject: Re: PCI resource allocation problem on Sun Ultra 10
Date: Thu, 16 Aug 2012 13:25:57 -0700 (PDT) [thread overview]
Message-ID: <20120816.132557.173944271888805402.davem@davemloft.net> (raw)
In-Reply-To: <alpine.SOC.1.00.1208161813240.11061@math.ut.ee>
From: Meelis Roos <mroos@linux.ee>
Date: Thu, 16 Aug 2012 18:15:24 +0300 (EEST)
> I tried to populate my Sun Ultra 10 with PCI cards. All but the last
> slot work but the last slot is assigned a non-working BAR. It sees that
> this area is reserved for Video ROM. Why is there Video ROM placeholder
> at that address - I see no resource in ATI VGA for it?
It's not a "placeholder", it's absolutely necessary because this range
is implicitly decoded by any VGA capable device in the system.
Therefore no device should ever be allocated that part of the address
space.
If OBP is allocating this range to non-VGA devices, it's buggy, and is
risking multiple devices responding at the same time to an I/O space
access.
next prev parent reply other threads:[~2012-08-16 20:26 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-16 15:15 PCI resource allocation problem on Sun Ultra 10 Meelis Roos
2012-08-16 20:25 ` David Miller [this message]
2012-08-17 7:19 ` Meelis Roos
2012-08-17 7:24 ` David Miller
2012-09-05 14:21 ` Meelis Roos
-- strict thread matches above, loose matches on Subject: below --
2012-08-16 15:07 Meelis Roos
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