MIPS: new Kconfig option ZBOOT_LOAD_ADDRESS

If this option is not 0x0, it will be used for zboot load address.
Otherwise, the result of calc_vmlinuz_load_addr will be used.

The zload-y value for generic are also removed then, as the current
value breaks booting on qemu -M boston.
The result of calc_vmlinuz_load_addr works well for most of cases.

The default value of bcm47xx keeps as it currently.
Signed-off-by: YunQiang Su <yunqiang.su@cipunited.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/Kconfig

@@ -2115,6 +2115,16 @@ config MIPS_VA_BITS_48
 
 	  If unsure, say N.
 
+config ZBOOT_LOAD_ADDRESS
+	hex "Compressed kernel load address"
+	default 0xffffffff80400000 if BCM47XX
+	default 0x0
+	depends on SYS_SUPPORTS_ZBOOT
+	help
+	  The address to load compressed kernel, aka vmlinuz.
+
+	  This is only used if non-zero.
+
 choice
 	prompt "Kernel page size"
 	default PAGE_SIZE_4KB

arch/mips/bcm47xx/Platform

@@ -4,4 +4,3 @@
 cflags-$(CONFIG_BCM47XX)	+=					\
 		-I$(srctree)/arch/mips/include/asm/mach-bcm47xx
 load-$(CONFIG_BCM47XX)		:= 0xffffffff80001000
-zload-$(CONFIG_BCM47XX)		+= 0xffffffff80400000

arch/mips/boot/compressed/Makefile

@@ -89,6 +89,10 @@ HOSTCFLAGS_calc_vmlinuz_load_addr.o += $(LINUXINCLUDE)
 # Calculate the load address of the compressed kernel image
 hostprogs := calc_vmlinuz_load_addr
 
+ifneq (0x0,$(CONFIG_ZBOOT_LOAD_ADDRESS))
+zload-y	= $(CONFIG_ZBOOT_LOAD_ADDRESS)
+endif
+
 ifneq ($(zload-y),)
 VMLINUZ_LOAD_ADDRESS := $(zload-y)
 else

arch/mips/generic/Platform

@@ -13,7 +13,6 @@ cflags-$(CONFIG_MACH_INGENIC_SOC)	+= -I$(srctree)/arch/mips/include/asm/mach-ing
 cflags-$(CONFIG_MIPS_GENERIC)	+= -I$(srctree)/arch/mips/include/asm/mach-generic
 
 load-$(CONFIG_MIPS_GENERIC)	+= 0xffffffff80100000
-zload-$(CONFIG_MIPS_GENERIC)	+= 0xffffffff81000000
 all-$(CONFIG_MIPS_GENERIC)	+= vmlinux.gz.itb
 
 its-y					:= vmlinux.its.S