From: Jeff Garzik <jeff@garzik.org>
To: Michael Chan <mchan@broadcom.com>
Cc: David Miller <davem@davemloft.net>, netdev <netdev@vger.kernel.org>
Subject: Re: [PATCH 3/20][BNX2]: Add 40-bit DMA workaround for 5708.
Date: Wed, 02 May 2007 16:30:36 -0400 [thread overview]
Message-ID: <4638F4EC.3000705@garzik.org> (raw)
In-Reply-To: <1178136161.4820.91.camel@dell>
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
next prev parent reply other threads:[~2007-05-02 20:30 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-02 1:13 [PATCH 3/20][BNX2]: Add 40-bit DMA workaround for 5708 Michael Chan
2007-05-02 7:06 ` Jeff Garzik
2007-05-02 7:12 ` David Miller
2007-05-02 15:23 ` Michael Chan
2007-05-02 15:28 ` Christoph Hellwig
2007-05-02 15:29 ` Jeff Garzik
2007-05-02 18:23 ` Michael Chan
2007-05-02 18:24 ` Jeff Garzik
2007-05-02 20:02 ` Michael Chan
2007-05-02 20:30 ` Jeff Garzik [this message]
2007-05-02 22:48 ` Christoph Hellwig
2007-05-02 22:50 ` David Miller
2007-05-02 19:40 ` David Miller
2007-05-02 21:27 ` Michael Chan
2007-05-02 21:45 ` David Miller
2007-05-02 23:28 ` Michael Chan
2007-05-02 22:48 ` David Miller
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