From: 黄涛 <huangtao@rock-chips.com>
Date: Tue, 12 Oct 2010 10:26:37 +0000 (+0800)
Subject: uImage: 使用gzip compressed方式生成uImage
X-Git-Tag: firefly_0821_release~11067
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=fda27a19be2867dd30f32c83187b312d361cd25a;p=firefly-linux-kernel-4.4.55.git

uImage: 使用gzip compressed方式生成uImage

UBOOT解压缩内核比内核自解压要快1.6s，可以提高启动速度。
不压缩是最快的，lzo稍慢，以后有机会可以迁移到lzo压缩方式。
---

diff --git a/arch/arm/boot/Makefile b/arch/arm/boot/Makefile
index 4a590f4113e2..d4ed498aefce 100644
--- a/arch/arm/boot/Makefile
+++ b/arch/arm/boot/Makefile
@@ -61,7 +61,7 @@ endif
 
 quiet_cmd_uimage = UIMAGE  $@
       cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A arm -O linux -T kernel \
-		   -C none -a $(LOADADDR) -e $(STARTADDR) \
+		   -C gzip -a $(LOADADDR) -e $(STARTADDR) \
 		   -n 'Linux-$(KERNELRELEASE)' -d $< $@
 
 ifeq ($(CONFIG_ZBOOT_ROM),y)
@@ -77,9 +77,13 @@ else
 $(obj)/uImage: STARTADDR=$(LOADADDR)
 endif
 
-$(obj)/uImage:	$(obj)/zImage FORCE
+$(obj)/Image.gz: $(obj)/Image FORCE
+	$(call if_changed,gzip)
+	@echo '  Image:  $@ is ready'
+
+$(obj)/uImage: $(obj)/Image.gz FORCE
 	$(call if_changed,uimage)
-	@echo '  Image $@ is ready'
+	@echo '  Image:  $@ is ready'
 
 $(obj)/bootp/bootp: $(obj)/zImage initrd FORCE
 	$(Q)$(MAKE) $(build)=$(obj)/bootp $@