From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tom Rini Date: Tue, 22 Nov 2016 10:08:48 -0500 Subject: [U-Boot] [PATCH] vexpress64: Juno: Change PCI buss addresses for IO to start from zero. In-Reply-To: <20161122120849.GT1005@e106497-lin.cambridge.arm.com> References: <20161122111918.1789-1-Liviu.Dudau@foss.arm.com> <20161122120849.GT1005@e106497-lin.cambridge.arm.com> Message-ID: <20161122150848.GP2546@bill-the-cat> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de On Tue, Nov 22, 2016 at 12:08:49PM +0000, Liviu Dudau wrote: > On Tue, Nov 22, 2016 at 11:29:20AM +0000, Sudeep Holla wrote: > > Hi Liviu, > > > > On Tue, Nov 22, 2016 at 11:19 AM, Liviu Dudau wrote: > > > Juno uses a 1:1 mapping between CPU and PCI addresses for IO. First, > > > that will trip devices that cannot use more than 16 bits of addresses > > > for IO, second it is un-necessary as the system can handle zero-based > > > PCI addresses just fine. > > > > > > Change the mapping to start IO bus addresses from zero. > > > > > > > I assume this require corresponding DT change, shout if that's not true. > > If that's true, then does this patch not require patching of DT so > > that systems not > > running Uboot with this patch continue to work and we retain the > > mainline DT as is ? > > Yes, it does require DT changes, Jeremy Linton has a patch So to be clear, what level of coordination do we need between the two parts being merged? It would not be ideal to have combinations of U-Boot and Linux not work. Thanks! -- Tom -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 819 bytes Desc: Digital signature URL: