From: Dan Malek <dan@mvista.com>
To: Eli Chen <eli@routefree.com>
Cc: linuxppc-embedded@lists.linuxppc.org,
Alexander Kolesnikov <akolesni@qualcomm.com>
Subject: Re: USB support in the HardHet Linux 2.4.2 on the IBM Walnut
Date: Tue, 04 Sep 2001 15:56:50 -0400 [thread overview]
Message-ID: <3B953202.E9E8DB54@mvista.com> (raw)
In-Reply-To: 009601c134d5$4bc7aca0$b300000a@foolio1
Eli Chen wrote:
> We have managed to get the USB ohci driver to work on the Walnut board. I
> believe one of the problems was that the 405gp platform did not guarantee
> cache coherency for pci-dma.
All of the problems found so far are associated with cache coherency.
One of the changes, which still isn't really correct, is to change the
consistent_sync() function to always writeback and invalidate. We
seem to be more lucky with this, but the proper solution is to cache
line align all buffers subject to DMA.
-- Dan
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
prev parent reply other threads:[~2001-09-04 19:56 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-08-30 9:19 USB support in the HardHet Linux 2.4.2 on the IBM Walnut Alexander Kolesnikov
2001-08-30 9:38 ` Adrian Cox
2001-09-04 0:05 ` Eli Chen
2001-09-04 19:56 ` Dan Malek [this message]
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