Merge remote branch 'origin/master' into pci

Conflicts:
	exec.c

1 files changed, 8 insertions, 4 deletions

diff --git a/hw/pflash_cfi02.c b/hw/pflash_cfi02.c
index 30c8aa4e4f..14bbc34e16 100644
--- a/hw/pflash_cfi02.c
+++ b/hw/pflash_cfi02.c
@@ -50,6 +50,8 @@ do {                                               \
 #define DPRINTF(fmt, ...) do { } while (0)
 #endif
 
+#define PFLASH_LAZY_ROMD_THRESHOLD 42
+
 struct pflash_t {
     BlockDriverState *bs;
     target_phys_addr_t base;
@@ -70,6 +72,7 @@ struct pflash_t {
     ram_addr_t off;
     int fl_mem;
     int rom_mode;
+    int read_counter; /* used for lazy switch-back to rom mode */
     void *storage;
 };
 
@@ -112,10 +115,10 @@ static uint32_t pflash_read (pflash_t *pfl, target_phys_addr_t offset,
 
     DPRINTF("%s: offset " TARGET_FMT_plx "\n", __func__, offset);
     ret = -1;
-    if (pfl->rom_mode) {
-        /* Lazy reset of to ROMD mode */
-        if (pfl->wcycle == 0)
-            pflash_register_memory(pfl, 1);
+    /* Lazy reset to ROMD mode after a certain amount of read accesses */
+    if (!pfl->rom_mode && pfl->wcycle == 0 &&
+        ++pfl->read_counter > PFLASH_LAZY_ROMD_THRESHOLD) {
+        pflash_register_memory(pfl, 1);
     }
     offset &= pfl->chip_len - 1;
     boff = offset & 0xFF;
@@ -254,6 +257,7 @@ static void pflash_write (pflash_t *pfl, target_phys_addr_t offset,
         /* Set the device in I/O access mode if required */
         if (pfl->rom_mode)
             pflash_register_memory(pfl, 0);
+        pfl->read_counter = 0;
         /* We're in read mode */
     check_unlock0:
         if (boff == 0x55 && cmd == 0x98) {