linux-kernel - Re: unchecked_isa_dma and BusLogic SCSI controller

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Date:	Thu, 2 Nov 2006 05:41:28 -0700
From:	Matthew Wilcox <matthew@....cx>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	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 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.

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