diff --git a/pc-bios/optionrom/linuxboot.S b/pc-bios/optionrom/linuxboot.S
index 8aebe51ee5..c10936344d 100644
--- a/pc-bios/optionrom/linuxboot.S
+++ b/pc-bios/optionrom/linuxboot.S
@@ -106,10 +106,10 @@ copy_kernel:
 	/* We're now running in 16-bit CS, but 32-bit ES! */
 
 	/* Load kernel and initrd */
-	read_fw_blob(FW_CFG_KERNEL)
-	read_fw_blob(FW_CFG_INITRD)
-	read_fw_blob(FW_CFG_CMDLINE)
-	read_fw_blob(FW_CFG_SETUP)
+	read_fw_blob_addr32(FW_CFG_KERNEL)
+	read_fw_blob_addr32(FW_CFG_INITRD)
+	read_fw_blob_addr32(FW_CFG_CMDLINE)
+	read_fw_blob_addr32(FW_CFG_SETUP)
 
 	/* And now jump into Linux! */
 	mov		$0, %eax
diff --git a/pc-bios/optionrom/optionrom.h b/pc-bios/optionrom/optionrom.h
index 4dcb90645c..fbdd48a021 100644
--- a/pc-bios/optionrom/optionrom.h
+++ b/pc-bios/optionrom/optionrom.h
@@ -50,13 +50,7 @@
 	bswap		%eax
 .endm
 
-/*
- * Read a blob from the fw_cfg device.
- * Requires _ADDR, _SIZE and _DATA values for the parameter.
- *
- * Clobbers:	%eax, %edx, %es, %ecx, %edi
- */
-#define read_fw_blob(var)				\
+#define read_fw_blob_pre(var)				\
 	read_fw		var ## _ADDR;			\
 	mov		%eax, %edi;			\
 	read_fw		var ## _SIZE;			\
@@ -65,10 +59,32 @@
 	mov		$BIOS_CFG_IOPORT_CFG, %edx;	\
 	outw		%ax, (%dx);			\
 	mov		$BIOS_CFG_IOPORT_DATA, %dx;	\
-	cld;						\
+	cld
+
+/*
+ * Read a blob from the fw_cfg device.
+ * Requires _ADDR, _SIZE and _DATA values for the parameter.
+ *
+ * Clobbers:	%eax, %edx, %es, %ecx, %edi
+ */
+#define read_fw_blob(var)				\
+	read_fw_blob_pre(var);				\
 	/* old as(1) doesn't like this insn so emit the bytes instead: \
 	rep insb	(%dx), %es:(%edi);		\
 	*/						\
+	.dc.b		0xf3,0x6c
+
+/*
+ * Read a blob from the fw_cfg device in forced addr32 mode.
+ * Requires _ADDR, _SIZE and _DATA values for the parameter.
+ *
+ * Clobbers:	%eax, %edx, %es, %ecx, %edi
+ */
+#define read_fw_blob_addr32(var)				\
+	read_fw_blob_pre(var);				\
+	/* old as(1) doesn't like this insn so emit the bytes instead: \
+	addr32 rep insb	(%dx), %es:(%edi);		\
+	*/						\
 	.dc.b		0x67,0xf3,0x6c
 
 #define OPTION_ROM_START					\