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authorPhilipp Zabel <p.zabel@pengutronix.de>2019-03-15 10:14:51 +0100
committerSascha Hauer <s.hauer@pengutronix.de>2019-03-18 09:43:35 +0100
commitaf85a0f8864e5888406bb13c3e3f99c5770959ca (patch)
tree00a371a06ac052d4499041964362fdc814777fa6 /Documentation
parentda9b86ec0fbec0eb60646e7a3c700076a423717d (diff)
downloadbarebox-af85a0f8864e5888406bb13c3e3f99c5770959ca.tar.gz
pstore: pass ramoops configuration to kernel via device tree
Instead of setting ramoops module parameters on the kernel command line, add a /reserved-memory/ramoops node to the device tree via of_fixup. Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de> Documentation-added-by: Juergen Borleis <jbe@pengutronix.de> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/filesystems/pstore.rst10
1 files changed, 6 insertions, 4 deletions
diff --git a/Documentation/filesystems/pstore.rst b/Documentation/filesystems/pstore.rst
index c128daa..00a5a05 100644
--- a/Documentation/filesystems/pstore.rst
+++ b/Documentation/filesystems/pstore.rst
@@ -42,10 +42,12 @@ written):
To use pstore/RAMOOPS both Barebox and Kernel have to be compiled with pstore
and RAM backend support. The kernel receives the parameters describing the
-layout over the kernel command line. These parameters are automatically
-generated by Barebox. You can change these parameters in Barebox menuconfig. The
-RAMOOPS parameters for the Kernel are stored in the variable
-global.linux.bootargs.ramoops.
+layout via devicetree or - as a fallback - over the kernel command line.
+To ensure both worlds are using the same memory layout, the required
+configuration data for the kernel is generated on-the-fly prior booting a kernel.
+For the devicetree use case Barebox adapts the kernel's devicetree, for the
+kernel command line fallback the variable ``global.linux.bootargs.ramoops`` is
+created and its content used to build the kernel command line.
You can adapt the *pstore* parameters in Barebox menuconfig.