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docs/manual: promote using fixed version for kernel headers when contributing a board

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When the default (newest) kernel headers series changes the build can
break. Example error message:

  Incorrect selection of kernel headers: expected 6.8.x, got 6.5.x

In the above case the defconfig used:

  BR2_LINUX_KERNEL_CUSTOM_VERSION=y
  BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.5.9"

The kernel headers were not specified, so the build defaulted to using
the kernel sources as header source and the default (newest) header
series. From .config:

  BR2_KERNEL_HEADERS_AS_KERNEL=y
  BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_6_8=y

Signed-off-by: Gero Schwäricke <gero.schwaericke@posteo.de>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>
(cherry picked from commit eb519ad7cc)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Gero Schwäricke
2024-04-03 21:30:38 +00:00
committed by Peter Korsgaard
parent e3b8078432
commit cdc2e042a1
1 changed files with 5 additions and 1 deletions
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6
docs/manual/adding-board-support.adoc
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@@ -32,7 +32,11 @@ Always use fixed versions or commit hashes for the different
components, not the "latest" version. For example, set
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y+ and
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE+ to the kernel version you tested
with.
with. If you are using the buildroot toolchain +BR2_TOOLCHAIN_BUILDROOT+
(which is the default), additionally ensure that the same kernel headers
are used (+BR2_KERNEL_HEADERS_AS_KERNEL+, which is also the default) and
set the custom kernel headers series to match your kernel version
(+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_*+).
It is recommended to use as much as possible upstream versions of the
Linux kernel and bootloaders, and to use as much as possible default