--- linux-2.6.22.14/drivers/serial/8250.c	2008-01-22 14:01:01.000000000 +0200
+++ linux/drivers/serial/8250.c	2008-01-15 11:01:32.000000000 +0200
@@ -44,6 +44,10 @@
 #include <asm/io.h>
 #include <asm/irq.h>
 
+#ifdef CONFIG_MIPS_MIKROTIK
+#include <asm/bootinfo.h>
+#endif
+
 #include "8250.h"
 
 /*
@@ -2852,6 +2856,10 @@ static int __init serial8250_init(void)
 	if (nr_uarts > UART_NR)
 		nr_uarts = UART_NR;
 
+#ifdef CONFIG_MIPS_MIKROTIK
+	if (mips_machgroup == MACH_GROUP_MT_RB100) return -1;
+#endif
+
 	printk(KERN_INFO "Serial: 8250/16550 driver $Revision: 1.90 $ "
 		"%d ports, IRQ sharing %sabled\n", nr_uarts,
 		share_irqs ? "en" : "dis");