From mboxrd@z Thu Jan 1 00:00:00 1970 From: Arnd Bergmann Subject: Re: [PATCH] of/fdt: export fdt blob as /sys/firmware/fdt Date: Mon, 10 Nov 2014 17:57:32 +0100 Message-ID: <3340387.dB5eK3mRnu@wuerfel> References: <1415638305-24463-1-git-send-email-ard.biesheuvel@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7Bit Return-path: In-Reply-To: <1415638305-24463-1-git-send-email-ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org Cc: Ard Biesheuvel , grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, leif.lindholm-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, geoff.levand-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, mark.rutland-5wv7dgnIgG8@public.gmane.org, rob.herring-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: devicetree@vger.kernel.org On Monday 10 November 2014 17:51:45 Ard Biesheuvel wrote: > Create a new /sys entry '/sys/firmware/fdt' to export the FDT blob > that was passed to the kernel by the bootloader. This allows userland > applications such as kexec to access the raw binary. > > The fact that this node does not reside under /sys/firmware/device-tree > is deliberate: FDT is also used on arm64 UEFI/ACPI systems to > communicate just the UEFI and ACPI entry points, but the FDT is never > unflattened and used to configure the system. > > Signed-off-by: Ard Biesheuvel Can you elaborate on the motivation? Initially the fdt format was introduced to make it easy to pass the information from /proc/device-tree to the next kernel for kexec. Are you interested in cases where this does not work? Arnd -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html