Index: kernel/arch/amd64/src/boot/boot.S
===================================================================
--- kernel/arch/amd64/src/boot/boot.S	(revision 1d3d2cf821c9a68d853e80ee2c7571d01c79b54a)
+++ kernel/arch/amd64/src/boot/boot.S	(revision 60898b690649d9e809606e6d12c17b2fb77db316)
@@ -516,10 +516,10 @@
 		movq $(PA2KA(0xb80a0)), %rsi
 		movq $(PA2KA(0xb8000)), %rdi
-		movq $480, %rcx
+		movl $480, %ecx
 		rep movsq
 		
 		/* Clear the 24th row */
-		xorq %rax, %rax
-		movq $20, %rcx
+		xorl %eax, %eax
+		movl $20, %ecx
 		rep stosq