[PATCH v2 15/16] arm64: boot: add Image.xz support

[Lasse Collin]

The Image.* targets existed for other compressors already. Bootloader
support is needed for decompression.

This is for CONFIG_EFI_ZBOOT=n. With CONFIG_EFI_ZBOOT=y, XZ was already
available.

Cc: Simon Glass <sjg at chromium.org>
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Will Deacon <will at kernel.org>
Cc: Jules Maselbas <jmaselbas at zdiv.net>
Cc: linux-arm-kernel at lists.infradead.org
Signed-off-by: Lasse Collin <lasse.collin at tukaani.org>
---
 arch/arm64/boot/Makefile | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/Makefile b/arch/arm64/boot/Makefile
index 607a67a649c4..b5a08333bc57 100644
--- a/arch/arm64/boot/Makefile
+++ b/arch/arm64/boot/Makefile
@@ -17,7 +17,7 @@
 OBJCOPYFLAGS_Image :=-O binary -R .note -R .note.gnu.build-id -R .comment -S
 
 targets := Image Image.bz2 Image.gz Image.lz4 Image.lzma Image.lzo \
-	Image.zst image.fit
+	Image.zst Image.xz image.fit
 
 $(obj)/Image: vmlinux FORCE
 	$(call if_changed,objcopy)
@@ -40,6 +40,9 @@ $(obj)/Image.lzo: $(obj)/Image FORCE
 $(obj)/Image.zst: $(obj)/Image FORCE
 	$(call if_changed,zstd)
 
+$(obj)/Image.xz: $(obj)/Image FORCE
+	$(call if_changed,xzkern)
+
 $(obj)/image.fit: $(obj)/Image $(obj)/dts/dtbs-list FORCE
 	$(call if_changed,fit)
 
-- 
2.45.2