diff -ur linux.old/arch/mips/kernel/head.S linux.dev/arch/mips/kernel/head.S
--- linux.old/arch/mips/kernel/head.S	2006-12-06 17:30:27.000000000 +0100
+++ linux.dev/arch/mips/kernel/head.S	2006-12-06 18:34:43.000000000 +0100
@@ -129,15 +129,20 @@
 #endif
 	.endm
 
-
 	j kernel_entry
 	nop
-
+	nop
+	
 	/*
 	 * Reserved space for exception handlers.
 	 * Necessary for machines which link their kernels at KSEG0.
+	 * Use as temporary storage for the kernel command line, so that it
+	 * can be updated easily without having to relink the kernel.
 	 */
-	.fill	0x400
+	 
+EXPORT(_image_cmdline)
+	.ascii "CMDLINE:"
+	.fill	0x3ec
 
 EXPORT(stext)					# used for profiling
 EXPORT(_stext)
diff -ur linux.old/arch/mips/rb500/prom.c linux.dev/arch/mips/rb500/prom.c
--- linux.old/arch/mips/rb500/prom.c	2006-12-06 17:30:27.000000000 +0100
+++ linux.dev/arch/mips/rb500/prom.c	2006-12-06 17:41:40.000000000 +0100
@@ -128,6 +128,7 @@
 	/* FIXME: STUB */
 }
 
+extern char _image_cmdline;
 void __init prom_setup_cmdline(void){
 	char cmd_line[CL_SIZE];
 	char *cp;
@@ -163,6 +164,9 @@
 		strcpy(cp,prom_argv[i]);
 		cp+=strlen(prom_argv[i]);
 	}
+	*(cp++) = ' ';
+	strcpy(cp,(&_image_cmdline + 8));
+	cp += strlen(&_image_cmdline);
 	
 	i=strlen(arcs_cmdline);
 	if (i>0){