[meta-oe][PATCH RESEND] kernel-uboot: allow compression option to be configurable

["Sinan Kaya" <okaya@kernel.org>]

While some platforms might choose to compress the kernel by
default especially when boot medium is slow, others want
uncompressed kernel.

The choice of decompression speed vs. load speed is very
platform dependent.

Allow platform to choose the option here.

Signed-off-by: Sinan Kaya <okaya@kernel.org>
---
 meta/classes/kernel-uboot.bbclass | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/meta/classes/kernel-uboot.bbclass b/meta/classes/kernel-uboot.bbclass
index 87f02654fa5..b1e7ac05c23 100644
--- a/meta/classes/kernel-uboot.bbclass
+++ b/meta/classes/kernel-uboot.bbclass
@@ -1,3 +1,7 @@
+# fitImage kernel compression algorithm
+FIT_KERNEL_COMP_ALG ?= "gzip"
+FIT_KERNEL_COMP_ALG_EXTENSION ?= ".gz"
+
 uboot_prep_kimage() {
 	if [ -e arch/${ARCH}/boot/compressed/vmlinux ]; then
 		vmlinux_path="arch/${ARCH}/boot/compressed/vmlinux"
@@ -11,8 +15,8 @@ uboot_prep_kimage() {
 		linux_comp="none"
 	else
 		vmlinux_path="vmlinux"
-		linux_suffix=".gz"
-		linux_comp="gzip"
+		linux_suffix="${FIT_KERNEL_COMP_ALG_EXTENSION}"
+		linux_comp="${FIT_KERNEL_COMP_ALG}"
 	fi
 
 	[ -n "${vmlinux_path}" ] && ${OBJCOPY} -O binary -R .note -R .comment -S "${vmlinux_path}" linux.bin
-- 
2.17.1