diff --git a/arch/microblaze/include/asm/io.h b/arch/microblaze/include/asm/io.h
index e4a7974786037023b66ba5565e5a9a38db53d282..4fbfdc1ac7f86c987fb3530fb3d76769e5b02cf6 100644
--- a/arch/microblaze/include/asm/io.h
+++ b/arch/microblaze/include/asm/io.h
@@ -35,6 +35,10 @@ extern resource_size_t isa_mem_base;
 
 #define IO_SPACE_LIMIT (0xFFFFFFFF)
 
+/* the following is needed to support PCI with some drivers */
+
+#define mmiowb()
+
 static inline unsigned char __raw_readb(const volatile void __iomem *addr)
 {
 	return *(volatile unsigned char __force *)addr;
diff --git a/arch/microblaze/include/asm/pci.h b/arch/microblaze/include/asm/pci.h
index a0da88bf70c575ab9000fb2d2cae86a01fd055f6..41cc841091b084e73692220324d30fd44ac0b018 100644
--- a/arch/microblaze/include/asm/pci.h
+++ b/arch/microblaze/include/asm/pci.h
@@ -22,6 +22,8 @@
 #include <asm/prom.h>
 #include <asm/pci-bridge.h>
 
+#include <asm-generic/pci-dma-compat.h>
+
 #define PCIBIOS_MIN_IO		0x1000
 #define PCIBIOS_MIN_MEM		0x10000000