From mboxrd@z Thu Jan 1 00:00:00 1970 From: Magnus Damm Date: Tue, 08 May 2012 16:34:47 +0000 Subject: Re: [PATCH 00/06] serial8250: DLL/DLM rework, Emma Mobile UART driver Message-Id: List-Id: References: <20120502124642.30480.41373.sendpatchset@w520> <201205041628.20024.arnd@arndb.de> In-Reply-To: <201205041628.20024.arnd@arndb.de> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Arnd Bergmann Cc: linux-serial@vger.kernel.org, horms@verge.net.au, linux-sh@vger.kernel.org, gregkh@linuxfoundation.org, swarren@wwwdotorg.org, linux-kernel@vger.kernel.org, rjw@sisk.pl, paul.gortmaker@windriver.com, lethal@linux-sh.org, olof@lixom.net, dan.j.williams@intel.com, alan@linux.intel.com On Sat, May 5, 2012 at 1:28 AM, Arnd Bergmann wrote: > On Wednesday 02 May 2012, Magnus Damm wrote: >> Note that there is no DT support included at this point, >> but it boils down to a 10 line change. The boot loader on >> my board does not do DT so I'd like to use kexec for DT >> development (as usual), but to use kexec I first need to >> get a non-DT kernel working. Which is basically this. =) > > As a follow-up on this, based on my comments to your emma platform > code, I think it would be easy enough to just use the appended > dtb support that we have, which allows you to boot a DT-enabled > kernel with a legacy boot loader. Thanks for your comments! I have some code going with DT now. Will post tomorrow. As for the appended dtb support, do you know the recommended way to include it in the uImage? It feels a bit odd to recommend customers to patch their kernel source to build a bootable kernel. I ended up with this local hackery, but there must be better ways: --- 0001/arch/arm/boot/Makefile +++ work/arch/arm/boot/Makefile 2012-05-09 00:40:17.000000000 +0900 @@ -53,6 +53,7 @@ $(obj)/compressed/vmlinux: $(obj)/Image $(obj)/zImage: $(obj)/compressed/vmlinux FORCE $(call if_changed,objcopy) + cat $(obj)/emev2-kzm9d.dtb >> $@ @echo ' Kernel: $@ is ready' endif Cheers, / magnus