linux-yocto: streamline BSP bootstrapping

In order to build BSPs that were not already integrated into
the upstream linux yocto kernel AND keep the git fetcher happy,
some fairly complex anonymous python sections were required.

These sections cause problems with variable expansion and SRCREV
processing.

With the updated git fetcher code, we can streamline the BSP
boostrapping process and drop 99% of the anonymous python code.

This commit has the following changes to support BSP boot strapping
and simplication for existing BSPs.

   - KMETA is set per-recipe rather than in python code
   - undefined machines are no longer used, but instead common
     branch names are set per-recipe
   - fallback machine SRCREVs are present in the default revisions
     file
   - A new variable YOCTO_KERNEL_EXTERNAL_BRANCH should be set in
     the local.conf for new BSPs instead of being programatically
     determined in the anonymous python.
   - No more explicity KMACHINE variable expansion and manipulation,
     since the tools and build phases no longer require it due
     to the per-recipe fallbacks.

Integrated/merged BSPs are unaffected by the changes and have been
regression tested.

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>

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Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>

3 files changed, 11 insertions, 7 deletions

diff --git a/meta/recipes-kernel/linux/linux-yocto-stable_git.bb b/meta/recipes-kernel/linux/linux-yocto-stable_git.bb
index d4bee77c21..3c1e669733 100644
--- a/meta/recipes-kernel/linux/linux-yocto-stable_git.bb
+++ b/meta/recipes-kernel/linux/linux-yocto-stable_git.bb
@@ -1,6 +1,7 @@
 inherit kernel
 require linux-yocto.inc
 
+KMACHINE = "common_pc"
 KMACHINE_qemux86  = "common_pc"
 KMACHINE_qemux86-64  = "common_pc_64"
 KMACHINE_qemuppc  = "qemu_ppc32"
@@ -14,20 +15,19 @@ KMACHINE_beagleboard = "beagleboard"
 LINUX_VERSION ?= "2.6.34"
 LINUX_VERSION_EXTENSION ?= "-yocto-${LINUX_KERNEL_TYPE_EXTENSION}"
 
+KMETA = wrs_meta
+KBRANCH = ${KMACHINE}-${LINUX_KERNEL_TYPE_EXTENSION}
+
 PR = "r1"
 PV = "${LINUX_VERSION}+git${SRCPV}"
 SRCREV_FORMAT = "meta_machine"
 
 COMPATIBLE_MACHINE = "(qemuarm|qemux86|qemuppc|qemumips|qemux86-64|atom-pc|routerstationpro|mpc8315e-rdb|beagleboard)"
 
-# this performs a fixup on the SRCREV for new/undefined BSPs
+# this performs a fixup on historical kernel types with embedded _'s
 python __anonymous () {
     import bb, re, string
 
-    rev = bb.data.getVar("SRCREV_machine", d, 1)
-    if rev == "standard":
-        bb.data.setVar("SRCREV_machine", "${SRCREV_meta}", d)
-
     kerntype = string.replace(bb.data.expand("${LINUX_KERNEL_TYPE}", d), "_", "-")
     bb.data.setVar("LINUX_KERNEL_TYPE_EXTENSION", kerntype, d)
 }
diff --git a/meta/recipes-kernel/linux/linux-yocto.inc b/meta/recipes-kernel/linux/linux-yocto.inc
index 3ad849e46e..03935fa702 100644
--- a/meta/recipes-kernel/linux/linux-yocto.inc
+++ b/meta/recipes-kernel/linux/linux-yocto.inc
@@ -7,7 +7,7 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=d7810fab7487fb0aad327b76f1be7cd7"
 # A KMACHINE is the mapping of a yocto $MACHINE to what is built
 # by the kernel. This is typically the branch that should be built,
 # and it can be specific to the machine or shared
-KMACHINE = "UNDEFINED"
+# KMACHINE = "UNDEFINED"
 
 # Set this to 'preempt_rt' in the local.conf if you want a real time kernel
 LINUX_KERNEL_TYPE ?= standard
@@ -19,4 +19,4 @@ addtask kernel_configme before do_configure after do_patch
 # Pick up shared functions
 inherit kernel-yocto
 
-B = "${WORKDIR}/linux-${KMACHINE}-${LINUX_KERNEL_TYPE}-build"
+B = "${WORKDIR}/linux-${MACHINE}-${LINUX_KERNEL_TYPE}-build"
diff --git a/meta/recipes-kernel/linux/linux-yocto_git.bb b/meta/recipes-kernel/linux/linux-yocto_git.bb
index cc52397006..75c6fb1653 100644
--- a/meta/recipes-kernel/linux/linux-yocto_git.bb
+++ b/meta/recipes-kernel/linux/linux-yocto_git.bb
@@ -1,6 +1,7 @@
 inherit kernel
 require linux-yocto.inc
 
+KMACHINE = "yocto/standard/base"
 KMACHINE_qemux86  = "yocto/standard/common-pc/base"
 KMACHINE_qemux86-64  = "yocto/standard/common-pc-64/base"
 KMACHINE_qemuppc  = "yocto/standard/qemu-ppc32"
@@ -11,6 +12,9 @@ KMACHINE_routerstationpro = "yocto/standard/routerstationpro"
 KMACHINE_mpc8315e-rdb = "yocto/standard/fsl-mpc8315e-rdb"
 KMACHINE_beagleboard = "yocto/standard/beagleboard"
 
+KBRANCH = ${KMACHINE}
+KMETA = meta
+
 LINUX_VERSION ?= "2.6.37"
 LINUX_VERSION_EXTENSION ?= "-yocto-${LINUX_KERNEL_TYPE}"
 PR = "r15"