linux-kernel - Re: unchecked_isa_dma and BusLogic SCSI controller

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Message-ID: <Pine.LNX.4.64N.0611021302340.7700@blysk.ds.pg.gda.pl>
Date:	Thu, 2 Nov 2006 13:04:12 +0000 (GMT)
From:	"Maciej W. Rozycki" <macro@...ux-mips.org>
To:	Matthew Wilcox <matthew@....cx>
cc:	Randy Dunlap <randy.dunlap@...cle.com>, Jun Sun <jsun@...sun.net>,
	linux-scsi@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>
Subject: Re: unchecked_isa_dma and BusLogic SCSI controller

On Thu, 2 Nov 2006, Matthew Wilcox wrote:

> > > 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.

 It could be related to the non-PCI variations of the board.

  Maciej
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