[source] ath25: fix duplicate LZMA compression

[LEDE Commits]

jow pushed a commit to source.git, branch master:
https://git.lede-project.org/?p=source.git;a=commitdiff;h=21f460a5dbef5e3ec59e2032b5b113fe045b475f

commit 21f460a5dbef5e3ec59e2032b5b113fe045b475f
Author: Jo-Philipp Wich <jo at mein.io>
AuthorDate: Tue Aug 9 17:23:56 2016 +0200

    ath25: fix duplicate LZMA compression
    
    The conversion to the new image building code accidentally caused the kernel
    image to get compressed twice, leading to boot failures when kernel and rootfs
    are flashed separately.
    
    The sysupgrade images have been unaffected by this. Also restore the elf
    kernel build artifact while we're at it.
    
    Signed-off-by: Jo-Philipp Wich <jo at mein.io>
---
 target/linux/ath25/image/Makefile | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/target/linux/ath25/image/Makefile b/target/linux/ath25/image/Makefile
index 4face05..5144ed8 100644
--- a/target/linux/ath25/image/Makefile
+++ b/target/linux/ath25/image/Makefile
@@ -42,19 +42,30 @@ define Build/lzma-kernel
 	dd if=$@.l7 of=$@ bs=65536 conv=sync
 endef
 
+define Build/copy-kernel
+	rm -f $@ $@.elf
+	cp $< $@
+	cp $< $@.elf
+endef
+
+define Build/elf-kernel
+	cp $(IMAGE_KERNEL).elf $@
+endef
+
 
 define Device/Default
   PROFILES = Default $$(DEVICE_NAME)
-  KERNEL := kernel-bin | lzma-kernel
+  KERNEL := copy-kernel | lzma-kernel
   IMAGES := sysupgrade.bin
   FILESYSTEMS := squashfs
 endef
 
 define Device/generic
   DEVICE_TITLE := Generic Images
-  IMAGES := kernel.lzma kernel.gz rootfs.bin sysupgrade.bin
-  IMAGE/kernel.gz := append-kernel | gzip-kernel
-  IMAGE/kernel.lzma := append-kernel | lzma-kernel
+  IMAGES := kernel.lzma kernel.elf kernel.gz rootfs.bin sysupgrade.bin
+  IMAGE/kernel.gz := elf-kernel | gzip-kernel
+  IMAGE/kernel.elf := elf-kernel
+  IMAGE/kernel.lzma := elf-kernel | lzma-kernel
   IMAGE/rootfs.bin := append-rootfs | pad-rootfs | pad-to 128k
   IMAGE/sysupgrade.bin := append-rootfs | pad-rootfs | pad-to 128k | combined-image
   IMAGE_NAME = $$(IMAGE_PREFIX)-$$(if $$(findstring kernel,$$(2)),,$$(1)-)$$(2)