[ARM] Add IXP2000 support to arch/arm/boot

Signed-off-by: Deepak Saxena <dsaxena@plexity.net>

arch/arm/boot/Makefile

@@ -51,6 +51,9 @@ initrd_phys-$(CONFIG_ARCH_SA1100)	:= 0xc0800000
 params_phys-$(CONFIG_ARCH_IOP3XX)	:= 0xa0000100
    zreladdr-$(CONFIG_ARCH_IXP4XX)	:= 0x00008000
 params-phys-$(CONFIG_ARCH_IXP4XX)	:= 0x00000100
+   zreladdr-$(CONFIG_ARCH_IXP2000)	:= 0x00008000
+params-phys-$(CONFIG_ARCH_IXP2000)	:= 0x00000100
+   zreladdr-$(CONFIG_ARCH_IXP2000)	:= 0x00008000
    zreladdr-$(CONFIG_ARCH_OMAP)		:= 0x10008000
 params_phys-$(CONFIG_ARCH_OMAP)		:= 0x10000100
 initrd_phys-$(CONFIG_ARCH_OMAP)		:= 0x10800000

arch/arm/boot/compressed/head.S

@@ -79,6 +79,14 @@
 		.endm
 		.macro	writeb, rb
 		str	\rb, [r3, #0]
+#elif defined(CONFIG_ARCH_IXP2000)
+		.macro	loadsp, rb
+		mov	\rb, #0xc0000000
+		orr	\rb, \rb, #0x00030000
+		.endm
+		.macro	writeb, rb
+		str	\rb, [r3, #0]
+		.endm
 #elif defined(CONFIG_ARCH_LH7A40X)
 		.macro	loadsp, rb
 		ldr	\rb, =0x80000700	@ UART2 UARTBASE