hw/nand.c: correct the sense of the BUSY/READY status bit

The BIT6 of Status Register(SR):

SR[6] behaves the same as R/B# pin
    SR[6] = 0 indicates the device is busy;
    SR[6] = 1 means the device is ready

Some NAND flash controller (i.e. ftnandc021) relies on the SR[6]
to determine if the NAND flash erase/program is success or error timeout.

P.S:
The exmaple NAND flash datasheet could be found at following link:
http://www.mxic.com.tw/QuickPlace/hq/PageLibrary4825740B00298A3B.nsf/h_Index/8FEA549237D2F7674825795800104C26/$File/MX30LF1G08AA,%203V,%201Gb,%20v1.1.pdf

Signed-off-by: Kuo-Jung Su <dantesu@gmail.com>
Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>

diff --git a/hw/nand.c b/hw/nand.c
index 4a71265..61e918f 100644 (file)
--- a/hw/nand.c
+++ b/hw/nand.c
@@ -46,7 +46,7 @@
 # define NAND_IOSTATUS_PLANE1  (1 << 2)
 # define NAND_IOSTATUS_PLANE2  (1 << 3)
 # define NAND_IOSTATUS_PLANE3  (1 << 4)
-# define NAND_IOSTATUS_BUSY    (1 << 6)
+# define NAND_IOSTATUS_READY    (1 << 6)
 # define NAND_IOSTATUS_UNPROTCT        (1 << 7)
 
 # define MAX_PAGE              0x800
@@ -231,6 +231,7 @@ static void nand_reset(DeviceState *dev)
     s->iolen = 0;
     s->offset = 0;
     s->status &= NAND_IOSTATUS_UNPROTCT;
+    s->status |= NAND_IOSTATUS_READY;
 }
 
 static inline void nand_pushio_byte(NANDFlashState *s, uint8_t value)