diff -urN linux.old/arch/mips/Kconfig linux.dev/arch/mips/Kconfig
--- linux.old/arch/mips/Kconfig	2006-11-29 22:57:37.000000000 +0100
+++ linux.dev/arch/mips/Kconfig	2006-12-14 04:09:50.000000000 +0100
@@ -780,6 +780,19 @@
 	select SYS_SUPPORTS_BIG_ENDIAN
 	select TOSHIBA_BOARDS
 
+config MIKROTIK_RB500
+	bool "Support for RB5xx boards"
+	select HW_HAS_PCI
+	select IRQ_CPU
+	select SYS_HAS_CPU_MIPS32_R1
+	select SYS_SUPPORTS_LITTLE_ENDIAN
+	select SYS_SUPPORTS_32BIT_KERNEL
+	select SWAP_IO_SPACE
+	select DMA_NONCOHERENT
+	help
+	  Support the Mikrotik(tm) Routerboard 500 series,
+	  such as the RB532.
+
 config TOSHIBA_RBTX4927
 	bool "Toshiba TBTX49[23]7 board"
 	select DMA_NONCOHERENT
@@ -1106,7 +1119,7 @@
 
 config MIPS_L1_CACHE_SHIFT
 	int
-	default "4" if MACH_DECSTATION || SNI_RM
+	default "4" if MACH_DECSTATION || SNI_RM || MIKROTIK_RB500
 	default "7" if SGI_IP27
 	default "5"
 
diff -urN linux.old/arch/mips/Makefile linux.dev/arch/mips/Makefile
--- linux.old/arch/mips/Makefile	2006-12-14 03:13:55.000000000 +0100
+++ linux.dev/arch/mips/Makefile	2006-12-14 04:09:50.000000000 +0100
@@ -586,6 +586,13 @@
 load-$(CONFIG_TOSHIBA_JMR3927)	+= 0xffffffff80050000
 
 #
+# Routerboard 532 board
+#
+core-$(CONFIG_MIKROTIK_RB500)	+= arch/mips/rb500/
+cflags-$(CONFIG_MIKROTIK_RB500) += -Iinclude/asm-mips/rc32434
+load-$(CONFIG_MIKROTIK_RB500)	+= 0xffffffff80101000
+
+#
 # Toshiba RBTX4927 board or
 # Toshiba RBTX4937 board
 #
diff -urN linux.old/arch/mips/pci/Makefile linux.dev/arch/mips/pci/Makefile
--- linux.old/arch/mips/pci/Makefile	2006-11-29 22:57:37.000000000 +0100
+++ linux.dev/arch/mips/pci/Makefile	2006-12-14 04:09:50.000000000 +0100
@@ -53,3 +53,4 @@
 obj-$(CONFIG_VICTOR_MPC30X)	+= fixup-mpc30x.o
 obj-$(CONFIG_ZAO_CAPCELLA)	+= fixup-capcella.o
 obj-$(CONFIG_WR_PPMC)		+= fixup-wrppmc.o
+obj-$(CONFIG_MIKROTIK_RB500)	+= pci-rc32434.o ops-rc32434.o fixup-rb500.o
diff -urN linux.old/drivers/pci/Makefile linux.dev/drivers/pci/Makefile
--- linux.old/drivers/pci/Makefile	2006-11-29 22:57:37.000000000 +0100
+++ linux.dev/drivers/pci/Makefile	2006-12-14 04:09:50.000000000 +0100
@@ -16,6 +16,7 @@
 
 # Build the PCI MSI interrupt support
 obj-$(CONFIG_PCI_MSI) += msi.o
+obj-$(CONFIG_MIKROTIK_RB500) += setup-irq.o
 
 # Build the Hypertransport interrupt support
 obj-$(CONFIG_HT_IRQ) += htirq.o
diff -urN linux.old/include/asm-mips/bootinfo.h linux.dev/include/asm-mips/bootinfo.h
--- linux.old/include/asm-mips/bootinfo.h	2006-11-29 22:57:37.000000000 +0100
+++ linux.dev/include/asm-mips/bootinfo.h	2006-12-14 04:09:50.000000000 +0100
@@ -212,6 +212,8 @@
 #define MACH_GROUP_NEC_EMMA2RH 25	/* NEC EMMA2RH (was 23)		*/
 #define  MACH_NEC_MARKEINS	0	/* NEC EMMA2RH Mark-eins	*/
 
+#define MACH_GROUP_MIKROTIK    24 /* Mikrotik Boards			    */
+
 #define CL_SIZE			COMMAND_LINE_SIZE
 
 const char *get_system_type(void);
diff -urN linux.old/include/asm-mips/cpu.h linux.dev/include/asm-mips/cpu.h
--- linux.old/include/asm-mips/cpu.h	2006-11-29 22:57:37.000000000 +0100
+++ linux.dev/include/asm-mips/cpu.h	2006-12-14 04:09:50.000000000 +0100
@@ -200,7 +200,8 @@
 #define CPU_SB1A		62
 #define CPU_74K			63
 #define CPU_R14000		64
-#define CPU_LAST		64
+#define CPU_RC32300		65
+#define CPU_LAST		65
 
 /*
  * ISA Level encodings