From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Subject: Re: [Cbe-oss-dev] [PATCH 3/3] Cell IOMMU static mapping support From: Benjamin Herrenschmidt To: Olof Johansson In-Reply-To: <20080128214813.GA24416@lixom.net> References: <9ce4678eef9e50908969eb1ef8470e307f3076ff.1201257905.git.michael@ellerman.id.au> <20080126025117.GA28066@lixom.net> <200801281241.49059.arnd@arndb.de> <20080128162343.GA19859@lixom.net> <1201554977.6815.189.camel@pasglop> <20080128214813.GA24416@lixom.net> Content-Type: text/plain Date: Tue, 29 Jan 2008 08:37:57 +1100 Message-Id: <1201556277.6815.194.camel@pasglop> Mime-Version: 1.0 Cc: linuxppc-dev@ozlabs.org, "cbe-oss-dev@ozlabs.org" , Arnd Bergmann Reply-To: benh@kernel.crashing.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Mon, 2008-01-28 at 15:48 -0600, Olof Johansson wrote: > > > Does the cell I/O bridge reflect out accesses to 2-4GB on the bus > > > again? If not, that could be another place to stick the dynamic range > > > for large config machines. > > > > On the PCI bus itself, 2-4GB is where MMIO sits. > > Depending on the implementation, 2-4GB accesses _from_ PCI could mean > something else. Not on PCI / PCI-X no. Maybe PCI-E could do that sort of ugly hacks but that wouldn't be within specs I believe. > But for most machines it doesn't, and I'm guessing cell > is one of those. Ben.