diff --git a/arch/powerpc/sysdev/indirect_pci.c b/arch/powerpc/sysdev/indirect_pci.c
index cfbd2aa..7fd49c9 100644
--- a/arch/powerpc/sysdev/indirect_pci.c
+++ b/arch/powerpc/sysdev/indirect_pci.c
@@ -123,6 +123,12 @@
 			(bus->number == hose->first_busno))
 		val &= 0xffffff00;
 
+	/* Workaround for PCI_28 Errata in 440EPx/GRx */
+	if ((hose->indirect_type & PPC_INDIRECT_TYPE_BROKEN_MRM) &&
+			offset == PCI_CACHE_LINE_SIZE) {
+		val = 0;
+	}
+
 	/*
 	 * Note: the caller has already checked that offset is
 	 * suitably aligned and that len is 1, 2 or 4.
diff --git a/arch/powerpc/sysdev/ppc4xx_pci.c b/arch/powerpc/sysdev/ppc4xx_pci.c
index 76886cf..fb368df 100644
--- a/arch/powerpc/sysdev/ppc4xx_pci.c
+++ b/arch/powerpc/sysdev/ppc4xx_pci.c
@@ -75,6 +75,11 @@
 	    !of_device_is_compatible(hose->dn, "ibm,plb-pci"))
 		return;
 
+	if (of_device_is_compatible(hose->dn, "ibm,plb440epx-pci") ||
+		of_device_is_compatible(hose->dn, "ibm,plb440grx-pci")) {
+		hose->indirect_type |= PPC_INDIRECT_TYPE_BROKEN_MRM;
+	}
+
 	/* Hide the PCI host BARs from the kernel as their content doesn't
 	 * fit well in the resource management
 	 */