Add KERNEL_EXTRA_ARGS parameter

With recent kernel versions, some ARM configurations need may fail to
build with errors like this:

	multiple load addresses: 0x80008000 0x80008000
	This is incompatible with uImages
	Specify LOADADDR on the commandline to build an uImage

We cannot pass this information in EXTRA_OEMAKE, as
"meta/classes/kernel.bbclass" explicitly ignores all EXTRA_OEMAKE
settings.  So add KERNEL_EXTRA_ARGS parameter so affected boards
can add for example

	KERNEL_EXTRA_ARGS = "LOADADDR=0x80008000"

to their configuration.  We make this general enough so other needed
command line options can be passed as well when compiling the kernel.

(From OE-Core rev: e3cdd0aafb9081cd7f1f98490087c1157a3d7403)

Signed-off-by: Wolfgang Denk <wd@denx.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 5 insertions, 2 deletions

diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
index 2bdc2fcdc5..5fe435681a 100644
--- a/meta/classes/kernel.bbclass
+++ b/meta/classes/kernel.bbclass
@@ -57,6 +57,9 @@ PACKAGE_ARCH = "${MACHINE_ARCH}"
 UBOOT_ENTRYPOINT ?= "20008000"
 UBOOT_LOADADDRESS ?= "${UBOOT_ENTRYPOINT}"
 
+# Some Linux kenrel configurations need additional parameters on the command line
+KERNEL_EXTRA_ARGS ?= ""
+
 # For the kernel, we don't want the '-e MAKEFLAGS=' in EXTRA_OEMAKE.
 # We don't want to override kernel Makefile variables from the environment
 EXTRA_OEMAKE = ""
@@ -71,7 +74,7 @@ KERNEL_IMAGETYPE_FOR_MAKE = "${@(lambda s: s[:-3] if s[-3:] == ".gz" else s)(d.g
 
 kernel_do_compile() {
         unset CFLAGS CPPFLAGS CXXFLAGS LDFLAGS MACHINE
-        oe_runmake ${KERNEL_IMAGETYPE_FOR_MAKE} ${KERNEL_ALT_IMAGETYPE} CC="${KERNEL_CC}" LD="${KERNEL_LD}"
+        oe_runmake ${KERNEL_IMAGETYPE_FOR_MAKE} ${KERNEL_ALT_IMAGETYPE} CC="${KERNEL_CC}" LD="${KERNEL_LD}" ${KERNEL_EXTRA_ARGS}
         if test "${KERNEL_IMAGETYPE_FOR_MAKE}.gz" = "${KERNEL_IMAGETYPE}"; then
                 gzip -9c < "${KERNEL_IMAGETYPE_FOR_MAKE}" > "${KERNEL_OUTPUT}"
         fi
@@ -80,7 +83,7 @@ kernel_do_compile() {
 do_compile_kernelmodules() {
         unset CFLAGS CPPFLAGS CXXFLAGS LDFLAGS MACHINE
         if (grep -q -i -e '^CONFIG_MODULES=y$' .config); then
-                oe_runmake ${PARALLEL_MAKE} modules CC="${KERNEL_CC}" LD="${KERNEL_LD}"
+                oe_runmake ${PARALLEL_MAKE} modules CC="${KERNEL_CC}" LD="${KERNEL_LD}" ${KERNEL_EXTRA_ARGS}
         else
                 bbnote "no modules to compile"
         fi