NetBSD-Bugs archive

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]

Re: port-amd64/42980: satalink DMA fails under amd64

The following reply was made to PR port-amd64/42980; it has been noted by GNATS.

From: Manuel Bouyer <>
To: Julian Bourne <>
Cc: matthew green <>,,,,
Subject: Re: port-amd64/42980: satalink DMA fails under amd64
Date: Thu, 18 Mar 2010 17:11:04 +0100

 On Wed, Mar 17, 2010 at 09:59:58PM -0400, Julian Bourne wrote:
 > Quick update - just verified that your exact patch works
 > too Matthew - and its a good thing to have in there
 > anyway (target the 8192 boundary workaround at the
 > right chipset).
 > I'll let you and Manuel work out the right way to address
 > the 3112 - please keep me on the distribution - I'm
 > curious about the answer.
 > In the meantime, I looked into why the i386 isn't
 > exhibiting the problem - it looks like it might be because
 > the arch/x86/x86/bus_dma:_bus_dmamem_alloc_range()
 > function simply doesn't make the same check
 > (boundary >= size) as the xen implementation in arch/xen/x86/xen_bus_dma.c?
 > Which begs the question, should it? (given that
 > bus_dmamem_alloc man page implies its a not a legal
 > argument (and thanks for the awesome man pages by the
 > way - NetBSD rules)).
 I think I explicitely added this check because the hypervisor
 can't handle a boundary constraint explicitely, and the allocator
 will return a memory that fits the constraint only if boundary >= size
 (thanksfully the specs already said that :)
 Manuel Bouyer <>
      NetBSD: 26 ans d'experience feront toujours la difference

Home | Main Index | Thread Index | Old Index