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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Yuri Tikhonov <yur@emcraft.com>
Cc: linuxppc-dev@ozlabs.org, Detlev Zundel <dzu@denx.de>,
	Wolfgang Denk <wd@denx.de>, Ilya Yanok <yanok@emcraft.com>
Subject: Re: [PATCH] katmai.dts: extend DMA ranges; add dma/sysace nodes
Date: Thu, 13 Nov 2008 20:25:52 +1100	[thread overview]
Message-ID: <1226568352.7178.44.camel@pasglop> (raw)
In-Reply-To: <200811131149.14715.yur@emcraft.com>

On Thu, 2008-11-13 at 11:49 +0300, Yuri Tikhonov wrote:
> Hello,
> 
> This patch extends DMA ranges for PCI(X) to 4GB, so that it could
> work on Katmais with 4GB RAM installed.

And where do you put MMIO ?

The 32 bit part of the PCI space need to be split between MMIO and DMA. 

Ideally, for 64-bit capable DMA, device, we should create a second DMA
range mapping the whole memory at something like 1T or so on PCI, and
keep a smaller (ie. 2G) DMA range for 32-bit only devices backed with
swiotlb.

Cheers,
Ben.

  reply	other threads:[~2008-11-13  9:26 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-11-13  8:49 [PATCH] katmai.dts: extend DMA ranges; add dma/sysace nodes Yuri Tikhonov
2008-11-13  9:25 ` Benjamin Herrenschmidt [this message]
2008-11-14  4:45   ` Re[2]: " Yuri Tikhonov
2008-11-14  5:41     ` Benjamin Herrenschmidt
     [not found]       ` <1767195957.20081127032002@emcraft.com>
2008-11-27  0:26         ` Re[4]: " Yuri Tikhonov
2008-11-27  0:42           ` Benjamin Herrenschmidt
2008-11-27  0:59             ` Re[6]: " Yuri Tikhonov
2008-11-27  4:07               ` Benjamin Herrenschmidt
2008-11-13 11:45 ` Josh Boyer
2008-11-14  5:00   ` Grant Likely
2008-11-14  5:27     ` Re[2]: " Yuri Tikhonov
2008-11-14  5:30       ` Grant Likely
2008-11-14  5:21   ` Yuri Tikhonov

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