1 files changed, 40 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index ef6f64950e9..a538824616f 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -1947,8 +1947,47 @@ static void __init fixup_device_tree_maple(void)
         prom_setprop(isa, name, "ranges",
                         isa_ranges, sizeof(isa_ranges));
 }
+
+#define CPC925_MC_START         0xf8000000
+#define CPC925_MC_LENGTH        0x1000000
+/* The values for memory-controller don't have right number of cells */
+static void __init fixup_device_tree_maple_memory_controller(void)
+{
+        phandle mc;
+        u32 mc_reg[4];
+        char *name = "/hostbridge@f8000000";
+        struct prom_t *_prom = &RELOC(prom);
+        u32 ac, sc;
+
+        mc = call_prom("finddevice", 1, 1, ADDR(name));
+        if (!PHANDLE_VALID(mc))
+                return;
+
+        if (prom_getproplen(mc, "reg") != 8)
+                return;
+
+        prom_getprop(_prom->root, "#address-cells", &ac, sizeof(ac));
+        prom_getprop(_prom->root, "#size-cells", &sc, sizeof(sc));
+        if ((ac != 2) || (sc != 2))
+                return;
+
+        if (prom_getprop(mc, "reg", mc_reg, sizeof(mc_reg)) == PROM_ERROR)
+                return;
+
+        if (mc_reg[0] != CPC925_MC_START || mc_reg[1] != CPC925_MC_LENGTH)
+                return;
+
+        prom_printf("Fixing up bogus hostbridge on Maple...\n");
+
+        mc_reg[0] = 0x0;
+        mc_reg[1] = CPC925_MC_START;
+        mc_reg[2] = 0x0;
+        mc_reg[3] = CPC925_MC_LENGTH;
+        prom_setprop(mc, name, "reg", mc_reg, sizeof(mc_reg));
+}
 #else
 #define fixup_device_tree_maple()
+#define fixup_device_tree_maple_memory_controller()
 #endif
 
 #ifdef CONFIG_PPC_CHRP
@@ -2189,6 +2228,7 @@ static void __init fixup_device_tree_efika(void)
 static void __init fixup_device_tree(void)
 {
         fixup_device_tree_maple();
+        fixup_device_tree_maple_memory_controller();
         fixup_device_tree_chrp();
         fixup_device_tree_pmac();
         fixup_device_tree_efika();