Index: linux-2.6/arch/arm/plat-mxc/include/mach/debug-macro.S
===================================================================
--- linux-2.6.orig/arch/arm/plat-mxc/include/mach/debug-macro.S	2011-08-05 00:38:15.000000000 +0200
+++ linux-2.6/arch/arm/plat-mxc/include/mach/debug-macro.S	2011-08-05 09:32:32.000000000 +0200
@@ -44,6 +44,14 @@
 #define UART_PADDR	MX51_UART1_BASE_ADDR
 #endif
 
+/* iMX50/53 have same addresses, but not iMX51 */
+#if defined(CONFIG_SOC_IMX50) || defined(CONFIG_SOC_IMX53)
+#ifdef UART_PADDR
+#error "CONFIG_DEBUG_LL is incompatible with multiple archs"
+#endif
+#define UART_PADDR	MX53_UART1_BASE_ADDR
+#endif
+
 #define UART_VADDR	IMX_IO_ADDRESS(UART_PADDR)
 
 		.macro	addruart, rp, rv