From: Matthew Wilcox <matthew@wil.cx>
To: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Jun Sun <jsun@junsun.net>,
linux-scsi@vger.kernel.org, lkml <linux-kernel@vger.kernel.org>
Subject: Re: unchecked_isa_dma and BusLogic SCSI controller
Date: Thu, 2 Nov 2006 05:41:28 -0700 [thread overview]
Message-ID: <20061102124128.GC31830@parisc-linux.org> (raw)
In-Reply-To: <20061101173358.7b027d13.randy.dunlap@oracle.com>
On Wed, Nov 01, 2006 at 05:33:58PM -0800, Randy Dunlap wrote:
> unchecked_isa_dma - 1=>only use bottom 16 MB of ram (ISA DMA addressing
> restriction), 0=>can use full 32 bit (or better) DMA
> address space
>
> > It is hard for me to see why BusLogic controller would only do DMA
> > in low 16MB. Is there a fix for this?
>
> Does anyone know that controller hardware and its limitations?
I don't, but:
if (pci_set_dma_mask(PCI_Device, DMA_32BIT_MASK ))
continue;
So somebody thinks the device can do 32-bit addressing. I would expect
that setting unchecked_isa_dma is a historical mistake. However, I
don't have any cards of this type to test.
next prev parent reply other threads:[~2006-11-02 12:41 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-01 23:53 unchecked_isa_dma and BusLogic SCSI controller Jun Sun
2006-11-02 1:33 ` Randy Dunlap
2006-11-02 12:41 ` Matthew Wilcox [this message]
2006-11-02 13:04 ` Maciej W. Rozycki
2006-11-02 13:35 ` Christoph Hellwig
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