On 14 June 2017 at 11:55, Mark Rutland <mark.rutl...@arm.com> wrote: > [Adding Ard, as he added /sys/firmware/fdt] >
Thanks > On Tue, Jun 13, 2017 at 09:20:07PM -0700, frowand.l...@gmail.com wrote: >> From: Frank Rowand <frank.row...@sony.com> >> >> Add ABI documentation for /sys/firmware/fdt >> >> Update contact for /sys/firmware/devicetree/* to include mail list >> >> Signed-off-by: Frank Rowand <frank.row...@sony.com> > > FWIW: > > Acked-by: Mark Rutland <mark.rutl...@arm.com> > Reviewed-by: Ard Biesheuvel <ard.biesheu...@linaro.org> >> --- >> Documentation/ABI/testing/sysfs-firmware-ofw | 27 >> ++++++++++++++++++++++++++- >> 1 file changed, 26 insertions(+), 1 deletion(-) >> >> diff --git a/Documentation/ABI/testing/sysfs-firmware-ofw >> b/Documentation/ABI/testing/sysfs-firmware-ofw >> index f562b188e71d..8e700db6c295 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.lik...@linaro.org> >> +Contact: Grant Likely <grant.lik...@linaro.org>, >> devicet...@vger.kernel.org >> Description: >> When using OpenFirmware or a Flattened Device Tree to enumerate >> hardware, the device tree structure will be exposed in this >> @@ -26,3 +26,28 @@ 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 <frank.row...@sony.com>, >> devicet...@vger.kernel.org >> +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.row...@sony.com> >> >> -- >> To unsubscribe from this list: send the line "unsubscribe devicetree" in >> the body of a message to majord...@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html > IMPORTANT NOTICE: The contents of this email and any attachments are > confidential and may also be privileged. If you are not the intended > recipient, please notify the sender immediately and do not disclose the > contents to any other person, use it for any purpose, or store or copy the > information in any medium. Thank you.
