[PATCH] of/fdt: export fdt blob as /sys/firmware/fdt

Arnd Bergmann arnd at arndb.de
Mon Nov 10 08:57:32 PST 2014

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 <ard.biesheuvel at linaro.org>

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?


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