From: Grant Grundler <iod00d@hp.com>
To: linux-ia64@vger.kernel.org
Subject: Re: dma restriction on Itanium 2
Date: Sat, 17 Jan 2004 03:58:54 +0000 [thread overview]
Message-ID: <20040117035854.GH18103@cup.hp.com> (raw)
In-Reply-To: <1074304095.6384.13.camel@kbiswas-dt.s2iotech.com>
Kallol,
please continue to include the linux-ia64 list in your replies.
On Fri, Jan 16, 2004 at 06:35:53PM -0800, Kallol Biswas wrote:
> Yes, I was talking about under HP-UX.
>
> Just to verify, inability to do DMA over page boundary on PA-RISC
> running HP-UX was a software limitation or hardware? You are saying
> it was a hp-ux(software) limitation, right?
Yes. HPUX has a similar interface for DMA mapping but a completely
different VM subsystem. Linux guarantees contiguous physical blocks
for multi-page memory allocations. HPUX does not. The linux DMA
subsystem uses that assumption.
I'm hoping someone who is better at decoding MCA data can
take a quick look at the data you posted earlier. If no one
else does by next week, I'll work on it then.
grant
next prev parent reply other threads:[~2004-01-17 3:58 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-17 1:48 dma restriction on Itanium 2 Kallol Biswas
2004-01-17 2:14 ` Grant Grundler
2004-01-17 3:58 ` Grant Grundler [this message]
2004-01-17 18:47 ` Christian Hinkelbein
2004-01-19 6:14 ` Grant Grundler
2004-01-19 16:00 ` Alex Williamson
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