From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rob Herring Subject: Re: [U-Boot] [RFC] Kbuild support for ARM FIT images Date: Thu, 21 Feb 2013 21:32:39 -0600 Message-ID: <5126E6D7.4020004@gmail.com> References: <20130221134656.GC17852@n2100.arm.linux.org.uk> <51262A7A.8040103@ti.com> <20130221182724.GA14329@obsidianresearch.com> <20130221211444.GB20114@obsidianresearch.com> <20130221231848.880DE200552@gemini.denx.de> <20130221232821.GA2823@obsidianresearch.com> <5126B979.5000205@gmail.com> <20130222022212.GB11169@obsidianresearch.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20130222022212.GB11169@obsidianresearch.com> Sender: linux-kbuild-owner@vger.kernel.org To: Jason Gunthorpe Cc: Wolfgang Denk , "Fernandes, Joel A" , Russell King - ARM Linux , linux-kbuild@vger.kernel.org, tony@atomide.com, Nicolas Pitre , Grant Likely , u-boot@lists.denx.de, Tom Rini , Grant Likely , OMAP List , ARM Kernel List List-Id: linux-omap@vger.kernel.org On 02/21/2013 08:22 PM, Jason Gunthorpe wrote: > On Thu, Feb 21, 2013 at 06:19:05PM -0600, Rob Herring wrote: > >> The desired FPGA use case is DT updates after booting the kernel. This >> has nothing to do with FIT images. And if the FPGA tools generate the >> DTB, then it is certainly not tied to the kernel. > > Completely unrelated, but do you have any pointer for how to do this? > Hot plugging a 'dtb fragment' into the kernel would be really handy.. > Look at "Introducing Device Tree Overlays" on devicetree-discuss and lkml. > I'm thinking something like adding a tree below a PCI controller > describing a PCI device and sub nodes, similar to what Thierry was > doing for his Avionics. How would interrupt maps and phandles be > managed across the main dtb and the 'hot plugged' dtb? Generally you don't describe the devices on PCI unless there are non-discoverable aspects like a sideband gpio. Rob