kernel-yocto: support allnoconfig base configuration

When creating a minimal config or creating a hard baseline for
incremental changes, it is often desired to disable all kernel
options and then begin building and enabling only what is required.

To support this workflow, a new variable KCONFIG_MODE is introduced
to contain a hint to the kernel configuration about how the kernel
config should be produced. This variable is passed directly to lkc
when it is invoked during configuration, so the contents of the
variable must be a valid option for the kernel config build.

Additionally, when a defconfig is detected, allnoconfig is enabled
as the default operation, unless otherwise specified by KCONFIG_MODE.

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

diff --git a/meta/classes/kernel-yocto.bbclass b/meta/classes/kernel-yocto.bbclass
index d555fc04b9d1951be3fab5b5e24ece418e3c230c..04a2f883b9909eab29ecc50749d546057819d65f 100644 (file)
--- a/meta/classes/kernel-yocto.bbclass
+++ b/meta/classes/kernel-yocto.bbclass
@@ -44,7 +44,8 @@ do_patch() {
 }
 
 do_kernel_checkout() {
-       if [ -d ${WORKDIR}/git/.git/refs/remotes/origin ]; then
+       if [ -d $
+{WORKDIR}/git/.git/refs/remotes/origin ]; then
                echo "Fixing up git directory for ${LINUX_KERNEL_TYPE}/${KMACHINE}"
                rm -rf ${S}
                mkdir ${S}
@@ -88,8 +89,18 @@ do_kernel_configme[dirs] = "${CCACHE_DIR} ${S} ${B}"
 do_kernel_configme() {
        echo "[INFO] doing kernel configme"
 
+       if [ -n ${KCONFIG_MODE} ]; then
+               configmeflags=${KCONFIG_MODE}
+       else
+               # If a defconfig was passed, use =n as the baseline, which is achieved
+               # via --allnoconfig
+               if [ -f ${WORKDIR}/defconfig ]; then
+                       configmeflags="--allnoconfig"
+               fi
+       fi
+
        cd ${S}
-       configme --reconfig --output ${B} ${KBRANCH} ${KMACHINE}
+       configme ${configmeflags} --reconfig --output ${B} ${KBRANCH} ${KMACHINE}
        if [ $? -ne 0 ]; then
                echo "ERROR. Could not configure ${KMACHINE}-${LINUX_KERNEL_TYPE}"
                exit 1