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[5/9] hw/block: m25p80: Support fast read for SST flashes

Message ID 20210114150902.11515-6-bmeng.cn@gmail.com
State New
Headers show
Series hw/block: m25p80: Fix the mess of dummy bytes needed for fast read commands | expand

Commit Message

Bin Meng Jan. 14, 2021, 3:08 p.m. UTC 
From: Bin Meng <bin.meng@windriver.com>

Per SST25VF016B datasheet [1], SST flash requires a dummy byte after
the address bytes. Note only SPI mode is supported by SST flashes.

[1] http://ww1.microchip.com/downloads/en/devicedoc/s71271_04.pdf

Signed-off-by: Bin Meng <bin.meng@windriver.com>
---

 hw/block/m25p80.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/hw/block/m25p80.c b/hw/block/m25p80.c
index e1e5d5a76f..512af61ba5 100644
--- a/hw/block/m25p80.c
+++ b/hw/block/m25p80.c
@@ -928,6 +928,9 @@  static void decode_fast_read_cmd(Flash *s)
     s->needed_bytes = get_addr_length(s);
     switch (get_man(s)) {
     /* Dummy cycles - modeled with bytes writes */
+    case MAN_SST:
+        s->needed_bytes += 1;
+        break;
     case MAN_WINBOND:
         switch (s->cmd_in_progress) {
         case FAST_READ: