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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>
This commit is contained in:
Kuo-Jung Su 2013-03-05 21:27:24 +00:00 committed by Edgar E. Iglesias
parent 76c48503c4
commit 0bc472a9d6
1 changed files with 2 additions and 1 deletions
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3
hw/nand.c
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@ -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)