Index: boot/arch/mips32/src/asm.S
===================================================================
--- boot/arch/mips32/src/asm.S	(revision 77918b0145fa4ff8bd0d178111ab29585f9f8db5)
+++ boot/arch/mips32/src/asm.S	(revision 9be2358aadbef3865ee2b3ab546d8b1f56d79cd6)
@@ -36,4 +36,15 @@
 .section BOOTSTRAP
 
+/*
+ * Registers on entry:
+ *
+ *   a0: kernel argument count (kargc)
+ *   a1: kernel argument vector (kargv) of kargc elements
+ *   a2: unused here (kenvp on Malta)
+ *   a3: RAM size on Malta
+ *
+ * This is the case on Malta.
+ * msim clears these registers, so it is de facto correct as well.
+ */
 SYMBOL(start)
 	/*
@@ -43,8 +54,8 @@
 	 *  - Disable 64-bit user addressing mode
 	 */
-	mfc0 $a0, $status
-	la $a1, 0xffffff1f
-	and $a0, $a1, $a0
-	mtc0 $a0, $status
+	mfc0 $t0, $status
+	la $t1, 0xffffff1f
+	and $t0, $t1, $t0
+	mtc0 $t0, $status
 
 #if defined(MACHINE_lmalta) || defined(MACHINE_bmalta)
@@ -52,6 +63,6 @@
 	 * Remember the size of the SDRAM in bootinfo.
 	 */
-	la $a0, PA2KA(BOOTINFO_OFFSET)
-	sw $a3, 0($a0)
+	la $t0, PA2KA(BOOTINFO_OFFSET)
+	sw $a3, 0($t0)
 #endif
 
@@ -61,47 +72,47 @@
 	 * but it not an issue).
 	 */
-	la $a0, PA2KA(CPUMAP_OFFSET)
+	la $t0, PA2KA(CPUMAP_OFFSET)
 
-	sw $zero, 0($a0)
-	sw $zero, 4($a0)
-	sw $zero, 8($a0)
-	sw $zero, 12($a0)
+	sw $zero, 0($t0)
+	sw $zero, 4($t0)
+	sw $zero, 8($t0)
+	sw $zero, 12($t0)
 
-	sw $zero, 16($a0)
-	sw $zero, 20($a0)
-	sw $zero, 24($a0)
-	sw $zero, 28($a0)
+	sw $zero, 16($t0)
+	sw $zero, 20($t0)
+	sw $zero, 24($t0)
+	sw $zero, 28($t0)
 
-	sw $zero, 32($a0)
-	sw $zero, 36($a0)
-	sw $zero, 40($a0)
-	sw $zero, 44($a0)
+	sw $zero, 32($t0)
+	sw $zero, 36($t0)
+	sw $zero, 40($t0)
+	sw $zero, 44($t0)
 
-	sw $zero, 48($a0)
-	sw $zero, 52($a0)
-	sw $zero, 56($a0)
-	sw $zero, 60($a0)
+	sw $zero, 48($t0)
+	sw $zero, 52($t0)
+	sw $zero, 56($t0)
+	sw $zero, 60($t0)
 
-	sw $zero, 64($a0)
-	sw $zero, 68($a0)
-	sw $zero, 72($a0)
-	sw $zero, 76($a0)
+	sw $zero, 64($t0)
+	sw $zero, 68($t0)
+	sw $zero, 72($t0)
+	sw $zero, 76($t0)
 
-	sw $zero, 80($a0)
-	sw $zero, 84($a0)
-	sw $zero, 88($a0)
-	sw $zero, 92($a0)
+	sw $zero, 80($t0)
+	sw $zero, 84($t0)
+	sw $zero, 88($t0)
+	sw $zero, 92($t0)
 
-	sw $zero, 96($a0)
-	sw $zero, 100($a0)
-	sw $zero, 104($a0)
-	sw $zero, 108($a0)
+	sw $zero, 96($t0)
+	sw $zero, 100($t0)
+	sw $zero, 104($t0)
+	sw $zero, 108($t0)
 
-	sw $zero, 112($a0)
-	sw $zero, 116($a0)
-	sw $zero, 120($a0)
-	sw $zero, 124($a0)
+	sw $zero, 112($t0)
+	sw $zero, 116($t0)
+	sw $zero, 120($t0)
+	sw $zero, 124($t0)
 
-	lui $a1, 1
+	lui $t1, 1
 
 #ifdef MACHINE_msim
@@ -119,7 +130,7 @@
 
 	/* Record CPU presence */
-	sll $a2, $k1, 2
-	addu $a2, $a2, $a0
-	sw $a1, ($a2)
+	sll $t2, $k1, 2
+	addu $t2, $t2, $t0
+	sw $t1, ($t2)
 
 	loop:
@@ -131,9 +142,10 @@
 	bsp:
 		/* Record CPU presence */
-		sw $a1, ($a0)
+		sw $t1, ($t0)
 
 		/* Setup initial stack */
 		la $sp, PA2KA(STACK_OFFSET)
 
+		/* a0=kargc, a1=kargv */
 		j bootstrap
 		nop
Index: boot/arch/mips32/src/main.c
===================================================================
--- boot/arch/mips32/src/main.c	(revision 77918b0145fa4ff8bd0d178111ab29585f9f8db5)
+++ boot/arch/mips32/src/main.c	(revision 9be2358aadbef3865ee2b3ab546d8b1f56d79cd6)
@@ -45,5 +45,5 @@
 static uint32_t *cpumap = (uint32_t *) PA2KA(CPUMAP_OFFSET);
 
-void bootstrap(void)
+void bootstrap(int kargc, char **kargv)
 {
 	version_print();
@@ -79,4 +79,7 @@
 	}
 
+	str_cpy(bootinfo->bootargs, sizeof(bootinfo->bootargs),
+	    (kargc > 1) ? kargv[1] : "");
+
 	uintptr_t entry = check_kernel(kernel_start);