When erasing the chip, use the typical time specified in the CFI table
rather than arbitrarily selecting 5 seconds.

Since the currently unconfigurable value set in the table is 12, this
means a chip erase takes 4096 ms so this isn't a big change in behavior.

Signed-off-by: Stephen Checkoway <stephen.checkoway@oberlin.edu>
---
 hw/block/pflash_cfi02.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/hw/block/pflash_cfi02.c b/hw/block/pflash_cfi02.c
index d9087cafff..76c8af4365 100644
--- a/hw/block/pflash_cfi02.c
+++ b/hw/block/pflash_cfi02.c
@@ -633,9 +633,9 @@ static void pflash_write(void *opaque, hwaddr offset, uint64_t value,
                 pflash_update(pfl, 0, pfl->total_len);
             }
             set_dq7(pfl, 0x00);
-            /* Let's wait 5 seconds before chip erase is done */
+            /* Wait the time specified at CFI address 0x22. */
             timer_mod(&pfl->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
-                      (NANOSECONDS_PER_SECOND * 5));
+                      (1ULL << pfl->cfi_table[0x22]) * SCALE_MS);
             break;
         case 0x30:
             /* Sector erase */
-- 
2.20.1 (Apple Git-117)