From mboxrd@z Thu Jan 1 00:00:00 1970 From: pavel@ucw.cz (Pavel Machek) Date: Tue, 27 Jan 2015 14:21:27 +0100 Subject: [PATCH] ARM: /proc/atags: Export also for DT In-Reply-To: References: <1403110464-29646-1-git-send-email-pali.rohar@gmail.com> <201412041857.49341@pali> <201501262016.52079@pali> Message-ID: <20150127132127.GA869@amd> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Mon 2015-01-26 14:33:21, Rob Herring wrote: > On Mon, Jan 26, 2015 at 1:16 PM, Pali Roh?r wrote: > > This patch will cause that decompressor store full ATAG structure into DT tree ("/atags"): > > > > + /* include the terminating ATAG_NONE */ > > + atag_size = (char *)atag - (char *)atag_list + sizeof(struct tag_header); > > + setprop(fdt, "/", "atags", atag_list, atag_size); > > + > > if (memcount) { > > setprop(fdt, "/memory", "reg", mem_reg_property, > > 4 * memcount * memsize); > > > > > > > > And this patch will export ATAG structure from DT tree ("/atags") into /proc/atags file: > > Please properly send your patches. Actually, when sending patches for discussion, this is format easier to read. > > Some userspace applications needs access to ATAG structure where can be stored some information passed > > from bootloader to kernel. Example is Nokia N900 device and NOLO bootloader which provides information > > about bootreason (device was started by power button or by alarm or restarted...) and bootmode (normal > > mode or device update mode). > > This goes in the commit message. > > These would be non-standard fields which are not upstream. I don't > know that we care in that case... Other devices are going to care about boot reason, too, and we might as well be compatible... Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html