From: Jun Sun <jsun@mvista.com>
To: Gerald Champagne <gerald.champagne@esstech.com>
Cc: linux-mips@oss.sgi.com
Subject: Re: ide dma in latest cvs
Date: Tue, 22 Jan 2002 11:00:42 -0800 [thread overview]
Message-ID: <3C4DB6DA.7F3E7386@mvista.com> (raw)
In-Reply-To: 3C4CA8C8.5010801@esstech.com
Gerald Champagne wrote:
>
> Does the latest CVS version work with an IDE controller in DMA mode?
>
> I have an NEC VR5432 based system working with the IDE controller, but it
> crashes when used in dma mode. I've tracked it down to the following code
> called from ide_build_sglist():
>
> - blk_rq_map_sg() is called to build a list of blocks to be transferred.
> It sets address = NULL for every entry (other fields like "page" are
> set to valid values).
>
> - dma_cache_wback_inv(addr, size) is called for each block entry. This
> routine crashes because the address parameter is always set to zero
> when the routine is called.
>
Did you check what the address is and why it is zero? It seems to me this
might be key ...
Jun
next prev parent reply other threads:[~2002-01-22 20:00 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-21 23:48 ide dma in latest cvs Gerald Champagne
2002-01-22 11:33 ` Vivien Chappelier
2002-01-22 19:00 ` Jun Sun [this message]
2002-01-22 20:03 ` Gerald Champagne
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