From: Frank Rowand <frank.rowand@xxxxxxxx> Add ABI documentation for /sys/firmware/fdt Update contact email for /sys/firmware/devicetree/* and add mail list Signed-off-by: Frank Rowand <frank.rowand@xxxxxxxx> --- changes from v2: - ignore v2, v3 is based on v1 changes from v1: - updated Grant's email address - updated Frank's email address Documentation/ABI/testing/sysfs-firmware-ofw | 26 +++++++++++++++++++++++++- 1 file changed, 25 insertions(+), 1 deletion(-) diff --git a/Documentation/ABI/testing/sysfs-firmware-ofw b/Documentation/ABI/testing/sysfs-firmware-ofw index f562b188e71d..edcab3ccfcc0 100644 --- a/Documentation/ABI/testing/sysfs-firmware-ofw +++ b/Documentation/ABI/testing/sysfs-firmware-ofw @@ -1,6 +1,6 @@ What: /sys/firmware/devicetree/* Date: November 2013 -Contact: Grant Likely <grant.likely@xxxxxxxxxx> +Contact: Grant Likely <grant.likely@xxxxxxx>, devicetree@xxxxxxxxxxxxxxx Description: When using OpenFirmware or a Flattened Device Tree to enumerate hardware, the device tree structure will be exposed in this @@ -26,3 +26,27 @@ Description: name plus address). Properties are represented as files in the directory. The contents of each file is the exact binary data from the device tree. + +What: /sys/firmware/fdt +Date: February 2015 +KernelVersion: 3.19 +Contact: Frank Rowand <frowand.list@xxxxxxxxx>, devicetree@xxxxxxxxxxxxxxx +Description: + Exports the FDT blob that was passed to the kernel by + the bootloader. This allows userland applications such + as kexec to access the raw binary. This blob is also + useful when debugging since it contains any changes + made to the blob by the bootloader. + + 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. +Users: kexec, debugging -- Frank Rowand <frank.rowand@xxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
