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-rw-r--r--meta-skeleton/recipes-kernel/linux/linux-yocto-custom.bb53
1 files changed, 36 insertions, 17 deletions
diff --git a/meta-skeleton/recipes-kernel/linux/linux-yocto-custom.bb b/meta-skeleton/recipes-kernel/linux/linux-yocto-custom.bb
index 55f0c38c036..1f0b3a25c66 100644
--- a/meta-skeleton/recipes-kernel/linux/linux-yocto-custom.bb
+++ b/meta-skeleton/recipes-kernel/linux/linux-yocto-custom.bb
@@ -1,17 +1,36 @@
# linux-yocto-custom.bb:
#
-# Provides an example/minimal kernel recipe that uses the linux-yocto
-# and oe-core kernel classes to apply a subset of yocto kernel
-# management to git managed kernel repositories.
+# An example kernel recipe that uses the linux-yocto and oe-core
+# kernel classes to apply a subset of yocto kernel management to git
+# managed kernel repositories.
+#
+# To use linux-yocto-custom in your layer, create a
+# linux-yocto-custom.bbappend file containing at least the following
+# lines:
+#
+# FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
+# COMPATIBLE_MACHINE_yourmachine = "yourmachine"
+#
+# You must also provide a Linux kernel configuration. The most direct
+# method is to copy your .config to files/defconfig in your layer,
+# in the same directory as the bbappend.
+#
+# To use the yocto kernel tooling to generate a BSP configuration
+# using modular configuration fragments, see the yocto-bsp and
+# yocto-kernel tools documentation.
+#
+# Warning:
+#
+# Building this example without providing a defconfig or BSP
+# configuration will result in build or boot errors. This is not a
+# bug.
+#
#
# Notes:
#
-# kconfig(s): the kernel must be configured with a defconfig, or via
-# configuration fragment(s). Either of these can be added
-# via bbappend.
-# patches: patches can be merged into to the source git tree itself, added
-# using standard bbappend syntax or controlled via .scc feature
-# descriptions (also via bbappends)
+# patches: patches can be merged into to the source git tree itself,
+# added via the SRC_URI, or controlled via a BSP
+# configuration.
#
# example configuration addition:
# SRC_URI += "file://smp.cfg"
@@ -20,25 +39,25 @@
# example feature addition (for kernel v3.4 only):
# SRC_URI += "file://feature.scc"
#
-# Warning:
-#
-# Building the sample kernel tree (kernel.org) without providing any
-# configuration will result in build or boot errors. This is not a bug
-# it is a required element for creating a valid kernel.
-#
inherit kernel
require recipes-kernel/linux/linux-yocto.inc
+# Override SRC_URI in a bbappend file to point at a different source
+# tree if you do not want to build from Linus' tree.
SRC_URI = "git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git;protocol=git;nocheckout=1"
LINUX_VERSION ?= "3.4"
LINUX_VERSION_EXTENSION ?= "-custom"
+# Override SRCREV to point to a different commit in a bbappend file to
+# build a different release of the Linux kernel.
# tag: v3.4 76e10d158efb6d4516018846f60c2ab5501900bc
SRCREV="76e10d158efb6d4516018846f60c2ab5501900bc"
-PR = "r0"
+PR = "r1"
PV = "${LINUX_VERSION}+git${SRCPV}"
-COMPATIBLE_MACHINE = "(qemuarm|qemux86|qemuppc|qemumips|qemux86-64)"
+# Override COMPATIBLE_MACHINE to include your machine in a bbappend
+# file. Leaving it empty here ensures an early explicit build failure.
+COMPATIBLE_MACHINE = "(^$)"