linux/cmem.inc: Support reserving memory for CMEM.

To reserve contiguous memory for CMEM:
* include the "recipes-kernel/linux/cmem.inc"
* Set CMEM_BASE and CMEM_SIZE to the physical memory address and size,
  respectively, to reserve for CMEM.

Currently limited to reserving a single memory region used to create
a single buffer pool of a single buffer.

Signed-off-by: Jacob Stiffler <j-stiffler@ti.com>
Signed-off-by: Denys Dmytriyenko <denys@ti.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/recipes-kernel/linux/cmem.inc b/recipes-kernel/linux/cmem.inc
new file mode 100644
index 00000000..742f3c80
--- /dev/null
+++ b/recipes-kernel/linux/cmem.inc
@@ -0,0 +1,23 @@
+SRC_URI += "file://cmem.dtsi"
+
+CMEM_BASE ?= ""
+CMEM_SIZE ?= ""
+
+do_setup_cmem() {
+    if [ ! -z "${CMEM_BASE}" ]
+    then
+        cp ${WORKDIR}/cmem.dtsi ${S}/arch/arm/boot/dts/${MACHINE}-cmem.dtsi
+
+        sed -i -e "s|__CMEM_BASE__|${CMEM_BASE}|g" \
+               -e "s|__CMEM_SIZE__|${CMEM_SIZE}|g" \
+               ${S}/arch/arm/boot/dts/${MACHINE}-cmem.dtsi
+
+        for dtb in ${KERNEL_DEVICETREE}
+        do
+            dts=`echo $dtb | sed -e 's|dtb$|dts|'`
+            echo "#include \"${MACHINE}-cmem.dtsi\"" >> ${S}/arch/arm/boot/dts/$dts
+        done
+    fi
+}
+
+do_patch[postfuncs] += "do_setup_cmem"