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| Started by | frowand.list@gmail.com |
|---|---|
| First post | 2017-06-29 00:30 +0200 |
| Last post | 2017-06-30 16:20 +0200 |
| Articles | 2 — 2 participants |
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[PATCH v3] of: document /sys/firmware/fdt frowand.list@gmail.com - 2017-06-29 00:30 +0200
Re: [PATCH v3] of: document /sys/firmware/fdt Rob Herring <robh+dt@kernel.org> - 2017-06-30 16:20 +0200
| From | frowand.list@gmail.com |
|---|---|
| Date | 2017-06-29 00:30 +0200 |
| Subject | [PATCH v3] of: document /sys/firmware/fdt |
| Message-ID | <tXtDc-13b-15@gated-at.bofh.it> |
From: Frank Rowand <frank.rowand@sony.com> 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@sony.com> --- 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@linaro.org> +Contact: Grant Likely <grant.likely@arm.com>, devicetree@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 +26,27 @@ 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@gmail.com>, devicetree@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.rowand@sony.com>
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| From | Rob Herring <robh+dt@kernel.org> |
|---|---|
| Date | 2017-06-30 16:20 +0200 |
| Message-ID | <tY4W5-6wZ-15@gated-at.bofh.it> |
| In reply to | #1677237 |
On Wed, Jun 28, 2017 at 5:21 PM, <frowand.list@gmail.com> wrote: > From: Frank Rowand <frank.rowand@sony.com> > > 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@sony.com> > --- Applied. Rob
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