diff --git a/BaS_gcc/include/pci.h b/BaS_gcc/include/pci.h
index b912dd6..af27656 100644
--- a/BaS_gcc/include/pci.h
+++ b/BaS_gcc/include/pci.h
@@ -198,11 +198,11 @@ typedef struct                       /* structure of address conversion     */
 #define PCI_STATUS(i)       ((i) & 0xffff)
 #define PCI_COMMAND(i)      (((i) >> 16) & 0xffff)
 
-/* register 0x08 macros */
-#define PCI_CLASS_CODE(i)   (((i) & 0xff000000) >> 24)
-#define PCI_SUBCLASS(i)     (((i) & 0x00ff0000) >> 16)
-#define PCI_PROG_IF(i)      (((i) & 0x0000ff00) >> 8)
-#define PCI_REVISION_ID(i)  (((i) & 0x000000ff))
+/* register 0x08 macros (use on little endian value!) */
+#define PCI_CLASS_CODE(i)   (((i) & 0x00ff0000) >> 16)
+#define PCI_SUBCLASS(i)     (((i) & 0x0000ff00) >> 8)
+#define PCI_PROG_IF(i)      (((i) & 0x000000ff) >> 0)
+#define PCI_REVISION_ID(i)  (((i) & 0xff000000) >> 24)
 
 /* register 0x0c macros */
 #define PCI_BIST(i)         (((i) & 0xff000000) >> 24)
diff --git a/BaS_gcc/include/radeonfb.h b/BaS_gcc/include/radeonfb.h
index 6f12093..5e2735b 100644
--- a/BaS_gcc/include/radeonfb.h
+++ b/BaS_gcc/include/radeonfb.h
@@ -12,6 +12,8 @@
 #include "wait.h"
 #include "video.h"
 
+#define RADEON_TILING
+
 //#include "radeon_theatre.h"
 
 #include "radeon_reg.h"
diff --git a/BaS_gcc/pci/pci.c b/BaS_gcc/pci/pci.c
index 694af1c..58a1db1 100644
--- a/BaS_gcc/pci/pci.c
+++ b/BaS_gcc/pci/pci.c
@@ -34,7 +34,7 @@
 #include "interrupts.h"
 #include "wait.h"
 
-// // #define DEBUG
+#define DEBUG
 #include "debug.h"
 
 #define pci_config_wait() do { __asm__ __volatile("tpf" ::: "memory"); } while (0)
@@ -513,81 +513,55 @@ int32_t pci_find_device(uint16_t device_id, uint16_t vendor_id, int index)
  */
 int32_t pci_find_classcode(uint32_t classcode, int index)
 {
-    uint16_t bus;
-    uint16_t device;
-    uint16_t function = 0;
-    uint16_t n = 0;
-    int32_t handle;
+    int i;
+    uint32_t handle;
+    uint32_t ret = PCI_DEVICE_NOT_FOUND;
+    int n = 0;
+    uint8_t find_mask;
+    uint32_t value;
+    int cmp;
+    bool match = false;
 
-    for (bus = 0; bus < 2; bus++)
+    classcode = swpl(classcode);
+    find_mask = classcode & 0xff;
+    classcode >>= 8;
+
+    do
     {
-        for (device = 10; device < 31; device++)
+        for (i = 0; (handle = handles[i]) != -1; i++)
         {
-            uint32_t value;
-            uint8_t htr;
-
-            handle = PCI_HANDLE(bus, device, 0);
-            dbg("check handle %d\r\n", handle);
-
-            value = swpl(pci_read_config_longword(handle, PCIIDR));
-
-            if (value != 0xffffffff)    /* device found */
+            match  = false;
+            for (cmp = 0; cmp < 3; cmp++)
             {
-                value = swpl(pci_read_config_longword(handle, PCICCR));
-
-                dbg("classcode to search for=%x\r\n", classcode);
-                dbg("PCI_CLASSCODE found=%02x\r\n", PCI_CLASS_CODE(value));
-                dbg("PCI_SUBCLASS found=%02x\r\n", PCI_SUBCLASS(value));
-                dbg("PCI_PROG_IF found=%02x\r\n", PCI_PROG_IF(value));
-
-                if ((classcode & (1 << 26) ? ((PCI_CLASS_CODE(value) == (classcode & 0xff))) : true) &&
-                    (classcode & (1 << 25) ? ((PCI_SUBCLASS(value) == ((classcode & 0xff00) >> 8))) : true) &&
-                    (classcode & (1 << 24) ? ((PCI_PROG_IF(value) == ((classcode & 0xff0000) >> 16))) : true))
+                if ((find_mask >> cmp) & 1)
                 {
-                    if (n == index)
+                    value = swpl(pci_read_config_longword(handle, PCICCR));
+                    dbg("compare classcode (0x%x), 0x%x against value (0x%x) 0x%x\r\n",
+                        classcode, (classcode >> (cmp * 8)) & 0xff, value, (value >> (cmp * 8)) & 0xff);
+                    if (((classcode >> (cmp * 8)) & 0xff) == ((value >> (cmp * 8)) & 0xff))
                     {
-                        dbg("found device at handle %d\r\n", handle);
-                        return handle;
+                        if (n == index)
+                            return handle;
+                        n++;
                     }
-                    n++;
-                }
-
-                /*
-                * there is a device at this position, but not the one we are looking for.
-                * Check to see if it is a multi-function device. We need to look "behind" it
-                * for the other functions in that case.
-                */
-                if ((htr = pci_read_config_byte(handle, PCI_LANESWAP_B(PCIHTR))) & 0x80)
-                {
-                    /* yes, this is a multi-function device, look for more functions */
-
-                    for (function = 1; function < 8; function++)
+                    else
                     {
-                        handle = PCI_HANDLE(bus, device, function);
-                        value = pci_read_config_longword(handle, PCIIDR);
-
-                        if (value != 0xffffffff)    /* device found */
-                        {
-                            value = swpl(pci_read_config_longword(handle, PCICCR));
-
-                            if ((classcode & PCI_FIND_BASE_CLASS ? ((PCI_CLASS_CODE(value) == (classcode & 0xff))) : true) &&
-                                (classcode & PCI_FIND_SUB_CLASS ? ((PCI_SUBCLASS(value) == ((classcode & 0xff00) >> 8))) : true) &&
-                                (classcode & PCI_FIND_PROG_IF ? ((PCI_PROG_IF(value) == ((classcode & 0xff0000) >> 16))) : true))
-                            {
-                                if (n == index)
-                                {
-                                    dbg("found device with handle %d\n", handle);
-                                    return handle;
-                                }
-                                n++;
-                            }
-                        }
+                        match = false;
+                        goto next;
                     }
                 }
+                else
+                    match = true;
             }
+
+next:
+            ;
         }
-    }
-    return PCI_DEVICE_NOT_FOUND;
+    } while (n < index);
+
+    if (match)
+        ret = handle;
+    return ret;
 }
 
 int32_t pci_hook_interrupt(int32_t handle, void *handler, void *parameter)
diff --git a/BaS_gcc/radeon/radeon_base.c b/BaS_gcc/radeon/radeon_base.c
index 3792b62..ae1f13f 100644
--- a/BaS_gcc/radeon/radeon_base.c
+++ b/BaS_gcc/radeon/radeon_base.c
@@ -1982,7 +1982,7 @@ int radeonfb_set_par(struct fb_info *info)
 #endif
         memcpy(&rinfo->state, newmode, sizeof(*newmode));
 #ifdef RADEON_TILING
-        rinfo->tilingEnabled = (mode->vmode & (FB_VMODE_DOUBLE | FB_VMODE_INTERLACED)) ? FALSE : TRUE;
+        rinfo->tilingEnabled = (mode->vmode & (FB_VMODE_DOUBLE | FB_VMODE_INTERLACED)) ? false : true;
 #endif
         radeon_write_mode(rinfo, newmode, 0);
         /* (re)initialize the engine */
diff --git a/BaS_gcc/sys/mmu.c b/BaS_gcc/sys/mmu.c
index 15a7574..a8ccd5f 100644
--- a/BaS_gcc/sys/mmu.c
+++ b/BaS_gcc/sys/mmu.c
@@ -3,7 +3,7 @@
 #include "exceptions.h"
 #include "pci.h"
 
-#define DEBUG
+// #define DEBUG
 #include "debug.h"
 
 /*
diff --git a/BaS_gcc/sys/sysinit.c b/BaS_gcc/sys/sysinit.c
index c4ea315..653ab7e 100644
--- a/BaS_gcc/sys/sysinit.c
+++ b/BaS_gcc/sys/sysinit.c
@@ -53,7 +53,7 @@
 #include "usb.h"
 #include "video.h"
 
-// // #define DEBUG
+#define DEBUG
 #include "debug.h"
 
 #define UNUSED(x) (void)(x)             /* Unused variable         */
@@ -588,11 +588,11 @@ void init_usb(void)
     int usb_found = 0;
     int index = 0;
 
-    xprintf("USB controller initialization:\r\n");
+    inf("USB controller initialization:\r\n");
 
     do
     {
-        handle = pci_find_classcode(PCI_CLASS_SERIAL_USB | PCI_FIND_BASE_CLASS | PCI_FIND_SUB_CLASS, index++);
+        handle = pci_find_classcode(PCI_CLASS_SERIAL_USB | PCI_FIND_BASE_CLASS | PCI_FIND_SUB_CLASS | PCI_FIND_PROG_IF, index++);
         dbg("handle 0x%02x\r\n", handle);
         if (handle > 0)
         {
diff --git a/BaS_gcc/usb/usb.c b/BaS_gcc/usb/usb.c
index 55d636b..acb8834 100644
--- a/BaS_gcc/usb/usb.c
+++ b/BaS_gcc/usb/usb.c
@@ -54,7 +54,7 @@
 #include "usb.h"
 #include "usb_hub.h"
 
-// // #define DEBUG
+// #define DEBUG
 #include "debug.h"
 
 struct hci
diff --git a/BaS_gcc/video/video.c b/BaS_gcc/video/video.c
index c0f0ac8..164da5a 100644
--- a/BaS_gcc/video/video.c
+++ b/BaS_gcc/video/video.c
@@ -286,7 +286,7 @@ static struct fb_var_screeninfo default_fb =
     .xres = 1280,
     .yres = 1024,
     .xres_virtual = 1280,
-    .yres_virtual = 1024,
+    .yres_virtual = 1024 * 2, /* ensure we have accel offscreen space */
     .bits_per_pixel = 8,
     .grayscale = 0,
     .red = { .length = 8 },
@@ -364,11 +364,6 @@ void video_init(void)
     int32_t id;
     bool radeon_found = false;
 
-    dbg("\r\n");
-
-    /* FIXME: we currently just return here because the PCI configuration of ATI cards does not (yet) work */
-    //return;
-
     do
     {
         /*