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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2014-11-14 18:05:35 +0100
committerGrant Likely <grant.likely@linaro.org>2014-11-19 15:09:49 +0000
commit08d53aa58cb162e65e25dbe31d28438657cb8e33 (patch)
tree2fdc4912e8036703fce7c4638ab2a4ea17fac034 /drivers/of/Kconfig
parent53a4ab96c61a34d62717b1481f6043e0b4338d74 (diff)
of/fdt: export fdt blob as /sys/firmware/fdt
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. A CRC32 checksum is calculated over the entire FDT blob, and verified at late_initcall time. The sysfs entry is instantiated only if the checksum is valid, i.e., if the FDT blob has not been modified in the mean time. Otherwise, a warning is printed. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Grant Likely <grant.likely@linaro.org>
Diffstat (limited to 'drivers/of/Kconfig')
-rw-r--r--drivers/of/Kconfig1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
index be16ce2ffd69..fbe8f8d418f7 100644
--- a/drivers/of/Kconfig
+++ b/drivers/of/Kconfig
@@ -23,6 +23,7 @@ config OF_FLATTREE
bool
select DTC
select LIBFDT
+ select CRC32
config OF_EARLY_FLATTREE
bool