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kernel-devicetree: Introduce KERNEL_DTC_FLAGS to pass dtc flags

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Currently DTC_FLAGS kernel makefile parameter can be specified directly on the
command line by adding it to KERNEL_EXTRA_ARGS. However, this prevents
scripts/Makefile.lib logic from appending flags that silence dtc warnings (all
assignments done from within a makefile, to a variable specified on the command
line, are ignored).

Because of this, the do_compile log is cluttered with dtc warnings that should
only be printed when compiling with W="123":
...
/soc: node has a reg or ranges property, but no unit name
/soc/gpu: missing or empty reg/ranges property
/soc/firmware/gpio: missing or empty reg/ranges property
...

To fix this, introduce the dedicated KERNEL_DTC_FLAGS variable to hold
dtc flags and export DTC_FLAGS in the environment before generating the dtbs
(make allows "+=" operations on variables that come from the environment, so
the warnings are silenced properly).

(From OE-Core rev: 063b5de86624a42b0aa784db6dddc7552a6dee7f)

Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Ovidiu Panait
2020-12-23 15:08:51 +02:00
committed by Richard Purdie
parent 4421e0969d
commit ff036cbb77
1 changed files with 7 additions and 0 deletions
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7
meta/classes/kernel-devicetree.bbclass
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@@ -9,6 +9,9 @@ FILES_${KERNEL_PACKAGE_NAME}-image-zimage-bundle = "/${KERNEL_IMAGEDEST}/zImage-
# Generate kernel+devicetree bundle
KERNEL_DEVICETREE_BUNDLE ?= "0"
# dtc flags passed via DTC_FLAGS env variable
KERNEL_DTC_FLAGS ?= ""
normalize_dtb () {
dtb="$1"
if echo $dtb | grep -q '/dts/'; then
@@ -50,6 +53,10 @@ do_configure_append() {
}
do_compile_append() {
if [ -n "${KERNEL_DTC_FLAGS}" ]; then
export DTC_FLAGS="${KERNEL_DTC_FLAGS}"
fi
for dtbf in ${KERNEL_DEVICETREE}; do
dtb=`normalize_dtb "$dtbf"`
oe_runmake $dtb CC="${KERNEL_CC} $cc_extra " LD="${KERNEL_LD}" ${KERNEL_EXTRA_ARGS}