diff --git a/tests/i440fx-test.c b/tests/i440fx-test.c
index 6fba741..08ce820 100644
--- a/tests/i440fx-test.c
+++ b/tests/i440fx-test.c
@@ -17,10 +17,12 @@
 #include "hw/pci/pci_regs.h"
 
 #include <glib.h>
-#include <stdio.h>
+#include <string.h>
 
 #define BROKEN 1
 
+#define ARRAY_SIZE(array) (sizeof(array) / sizeof((array)[0]))
+
 typedef struct TestData
 {
     int num_cpus;
@@ -119,6 +121,139 @@ static void test_i440fx_defaults(gconstpointer opaque)
     g_assert_cmpint(qpci_config_readb(dev, 0x93), ==, 0x00); /* TRC */
 }
 
+#define PAM_RE 1
+#define PAM_WE 2
+
+static void pam_set(QPCIDevice *dev, int index, int flags)
+{
+    int regno = 0x59 + (index / 2);
+    uint8_t reg;
+
+    reg = qpci_config_readb(dev, regno);
+    if (index & 1) {
+        reg = (reg & 0x0F) | (flags << 4);
+    } else {
+        reg = (reg & 0xF0) | flags;
+    }
+    qpci_config_writeb(dev, regno, reg);
+}
+
+static gboolean verify_area(uint32_t start, uint32_t end, uint8_t value)
+{
+    uint32_t size = end - start + 1;
+    gboolean ret = TRUE;
+    uint8_t *data;
+    int i;
+
+    data = g_malloc0(size);
+    memread(start, data, size);
+
+    g_test_message("verify_area: data[0] = 0x%x", data[0]);
+
+    for (i = 0; i < size; i++) {
+        if (data[i] != value) {
+            ret = FALSE;
+            break;
+        }
+    }
+
+    g_free(data);
+
+    return ret;
+}
+
+static void write_area(uint32_t start, uint32_t end, uint8_t value)
+{
+    uint32_t size = end - start + 1;
+    uint8_t *data;
+
+    data = g_malloc0(size);
+    memset(data, value, size);
+    memwrite(start, data, size);
+
+    g_free(data);
+}
+
+static void test_i440fx_pam(gconstpointer opaque)
+{
+    const TestData *s = opaque;
+    QPCIDevice *dev;
+    int i;
+    static struct {
+        uint32_t start;
+        uint32_t end;
+    } pam_area[] = {
+        { 0, 0 },             /* Reserved */
+        { 0xF0000, 0xFFFFF }, /* BIOS Area */
+        { 0xC0000, 0xC3FFF }, /* Option ROM */
+        { 0xC4000, 0xC7FFF }, /* Option ROM */
+        { 0xC8000, 0xCBFFF }, /* Option ROM */
+        { 0xCC000, 0xCFFFF }, /* Option ROM */
+        { 0xD0000, 0xD3FFF }, /* Option ROM */
+        { 0xD4000, 0xD7FFF }, /* Option ROM */
+        { 0xD8000, 0xDBFFF }, /* Option ROM */
+        { 0xDC000, 0xDFFFF }, /* Option ROM */
+        { 0xE0000, 0xE3FFF }, /* BIOS Extension */
+        { 0xE4000, 0xE7FFF }, /* BIOS Extension */
+        { 0xE8000, 0xEBFFF }, /* BIOS Extension */
+        { 0xEC000, 0xEFFFF }, /* BIOS Extension */
+    };
+
+    dev = qpci_device_find(s->bus, QPCI_DEVFN(0, 0));
+    g_assert(dev != NULL);
+
+    for (i = 0; i < ARRAY_SIZE(pam_area); i++) {
+        if (pam_area[i].start == pam_area[i].end) {
+            continue;
+        }
+
+        g_test_message("Checking area 0x%05x..0x%05x",
+                       pam_area[i].start, pam_area[i].end);
+        /* Switch to RE for the area */
+        pam_set(dev, i, PAM_RE);
+        /* Verify the RAM is all zeros */
+        g_assert(verify_area(pam_area[i].start, pam_area[i].end, 0));
+
+        /* Switch to WE for the area */
+        pam_set(dev, i, PAM_RE | PAM_WE);
+        /* Write out a non-zero mask to the full area */
+        write_area(pam_area[i].start, pam_area[i].end, 0x42);
+
+#ifndef BROKEN
+        /* QEMU only supports a limited form of PAM */
+
+        /* Switch to !RE for the area */
+        pam_set(dev, i, PAM_WE);
+        /* Verify the area is not our mask */
+        g_assert(!verify_area(pam_area[i].start, pam_area[i].end, 0x42));
+#endif
+
+        /* Verify the area is our new mask */
+        g_assert(verify_area(pam_area[i].start, pam_area[i].end, 0x42));
+
+        /* Write out a new mask */
+        write_area(pam_area[i].start, pam_area[i].end, 0x82);
+
+#ifndef BROKEN
+        /* QEMU only supports a limited form of PAM */
+
+        /* Verify the area is not our mask */
+        g_assert(!verify_area(pam_area[i].start, pam_area[i].end, 0x82));
+
+        /* Switch to RE for the area */
+        pam_set(dev, i, PAM_RE | PAM_WE);
+#endif
+        /* Verify the area is our new mask */
+        g_assert(verify_area(pam_area[i].start, pam_area[i].end, 0x82));
+
+        /* Reset area */
+        pam_set(dev, i, 0);
+
+        /* Verify the area is not our new mask */
+        g_assert(!verify_area(pam_area[i].start, pam_area[i].end, 0x82));
+    }
+}
+
 int main(int argc, char **argv)
 {
     QTestState *s;
@@ -137,6 +272,8 @@ int main(int argc, char **argv)
     data.bus = qpci_init_pc();
 
     g_test_add_data_func("/i440fx/defaults", &data, test_i440fx_defaults);
+    g_test_add_data_func("/i440fx/pam", &data, test_i440fx_pam);
+    
 
     ret = g_test_run();
 
