netdev - Re: [PATCH 3/20][BNX2]: Add 40-bit DMA workaround for 5708.

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Date:	Wed, 02 May 2007 16:30:36 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Michael Chan <mchan@...adcom.com>
CC:	David Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH 3/20][BNX2]: Add 40-bit DMA workaround for 5708.

Michael Chan wrote:
> If CONFIG_HIGHMEM is not set,
> wouldn't the device get > 32-bit DMA addresses that it cannot handle?

No -- presuming your PCI device's DMA mask is set correctly.

> I know that there are 64-bit systems without IOMMUs.  That's why we need
[...]
> needed or not.  These systems without IOMMU must support 32-bit only
> cards, right?  How do they do that if they are not using CONFIG_HIGHMEM?

pci_set_dma_mask()

	Jeff

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