diff --git a/hw/pc.c b/hw/pc.c
index 97964b27ebd487de863e782541d4fbf73d8c8a54..dac01ce57515c90080b45fd13c0b9421b5889f60 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -666,7 +666,7 @@ static int load_multiboot(void *fw_cfg,
 
             /* append module data at the end of last module */
             mb_kernel_data = qemu_realloc(mb_kernel_data,
-                                          mh_load_addr - mb_mod_end);
+                                          mb_mod_end - mh_load_addr);
             load_image(initrd_filename,
                        mb_kernel_data + mb_mod_start - mh_load_addr);
 
diff --git a/pc-bios/multiboot.bin b/pc-bios/multiboot.bin
index 59737c3c6798f83c1b35534d7865c79ba9ca3bc8..d7da6e04ad6d71d26f577d9d6a019719bcce8766 100644
Binary files a/pc-bios/multiboot.bin and b/pc-bios/multiboot.bin differ
diff --git a/pc-bios/optionrom/multiboot.S b/pc-bios/optionrom/multiboot.S
index be5c9fcf36ffb6b8b6edc5981b0ace8acf362d49..913183739cee764cec43ad24f6ae77fe2fb97d65 100644
--- a/pc-bios/optionrom/multiboot.S
+++ b/pc-bios/optionrom/multiboot.S
@@ -62,6 +62,9 @@ run_multiboot:
 	add		%eax, %ebx
 	movl		%ebx, %gs:GS_GDT_DESC + 2
 
+	xor		%eax, %eax
+	mov		%eax, %es
+
 	/* Read the bootinfo struct into RAM */
 	read_fw_blob(FW_CFG_INITRD)
 
@@ -71,7 +74,7 @@ run_multiboot:
 	mov		%ax, %fs
 
 	/* ES = mmap_addr */
-	mov		%eax, %fs:0x48
+	mov 		%fs:48, %eax
 	shr		$4, %eax
 	mov		%ax, %es