aboutsummaryrefslogtreecommitdiff
path: root/hw
diff options
context:
space:
mode:
Diffstat (limited to 'hw')
-rw-r--r--hw/block/pflash_cfi01.c18
1 files changed, 13 insertions, 5 deletions
diff --git a/hw/block/pflash_cfi01.c b/hw/block/pflash_cfi01.c
index d67f84d..3cd483d 100644
--- a/hw/block/pflash_cfi01.c
+++ b/hw/block/pflash_cfi01.c
@@ -278,9 +278,13 @@ static uint32_t pflash_read(PFlashCFI01 *pfl, hwaddr offset,
/* This should never happen : reset state & treat it as a read */
DPRINTF("%s: unknown command state: %x\n", __func__, pfl->cmd);
pfl->wcycle = 0;
- pfl->cmd = 0;
+ /*
+ * The command 0x00 is not assigned by the CFI open standard,
+ * but QEMU historically uses it for the READ_ARRAY command (0xff).
+ */
+ pfl->cmd = 0x00;
/* fall through to read code */
- case 0x00:
+ case 0x00: /* This model reset value for READ_ARRAY (not CFI compliant) */
/* Flash area read */
ret = pflash_data_read(pfl, offset, width, be);
break;
@@ -449,7 +453,7 @@ static void pflash_write(PFlashCFI01 *pfl, hwaddr offset,
case 0:
/* read mode */
switch (cmd) {
- case 0x00: /* ??? */
+ case 0x00: /* This model reset value for READ_ARRAY (not CFI) */
goto reset_flash;
case 0x10: /* Single Byte Program */
case 0x40: /* Single Byte Program */
@@ -646,7 +650,7 @@ static void pflash_write(PFlashCFI01 *pfl, hwaddr offset,
trace_pflash_reset();
memory_region_rom_device_set_romd(&pfl->mem, true);
pfl->wcycle = 0;
- pfl->cmd = 0;
+ pfl->cmd = 0x00; /* This model reset value for READ_ARRAY (not CFI) */
}
@@ -762,7 +766,11 @@ static void pflash_cfi01_realize(DeviceState *dev, Error **errp)
}
pfl->wcycle = 0;
- pfl->cmd = 0;
+ /*
+ * The command 0x00 is not assigned by the CFI open standard,
+ * but QEMU historically uses it for the READ_ARRAY command (0xff).
+ */
+ pfl->cmd = 0x00;
pfl->status = 0x80; /* WSM ready */
/* Hardcoded CFI table */
/* Standard "QRY" string */