[U-Boot] Write opeartion on flash fails.

[prakash bedge]

Hi,

I am using the ST make M29W128GH flash chip on my customized board.
I am able to read the flash and able to execute all uboot commands relevant
for flash read operations.
But any write operation fails on flash. I tried to use the "mw" command on
flash but it failed.
Also one time I get the output message as "flash is busy :1" contniously for
10 mins and so I reset the board.
But after that flash is not getting detected by my utiltiy and it gives
message as "flash is not present".
What wrong happened with flash?

I tested the Read CFI query using mw and md operation.
flash base - 0xff000000

$  mw.w 0xff000000 0xf0
$  mw.w 0xff0000aa 0x98
$  md.w 0xff000020
ff000020: ffff ffff ffff ffff ffff ffff ffff ffff    ................
ff000030: ffff ffff ffff ffff ffff ffff ffff ffff    ................
ff000040: ffff ffff ffff ffff ffff ffff ffff ffff    ................
ff000050: ffff ffff ffff ffff ffff ffff ffff ffff    .

I tried to write at different memory address on flash chip. But it also
didn't worked.
$  mw.w 0xff160000 0x55AA
$  md.w 0xff160000
ff160000: ffff ffff ffff ffff ffff ffff ffff ffff    ................
ff000010: ffff ffff ffff ffff ffff ffff ffff ffff    ................
ff000020: ffff ffff ffff ffff ffff ffff ffff ffff    ................
ff000030: ffff ffff ffff ffff ffff ffff ffff ffff    .

I checked the function do_mem_mw ( I believe this is used for "mw" command).
This function just put the value at given address. It means that flash
mapping is already done somewhere and value should be written in the address
given to the mw command. PCIMW.

flash read/write operation works in flash_detect_cfi fucntion.
FLASH: flash detect cfi
fwc addr ff000000 cmd ff ff00 16bit x 8 bit
fwc addr ff000000 cmd f0 f000 16bit x 8 bit
fwc addr ff0000aa cmd 98 9800 16bit x 8 bit
is= cmd 51(Q) addr ff000020 is= 5100 5100
is= cmd 52(R) addr ff000022 is= 5200 5200
is= cmd 59(Y) addr ff000024 is= 5900 5900
device interface is 2
found port 2 chip 1 port 16 bits chip 8 bits

Return With CFI conformant
00 : 51 52 59 02 00 40 00 00 00 00 00 27 36 b5 c5 04  QRY.. at .....'6...
10 : 04 09 10 04 04 03 04 18 02 00 06 00 01 7f 00 00  ................
20 : 02 00 00 00 00 00 00 00 00 00 00 00 00 ec 9e c0  ................
fwc addr ff0000aa cmd 98 9800 16bit x 8 bit
manufacturer is 2
manufacturer id is 0x20
device id is 0x7e
device id2 is 0x2101
cfi version is 0x3133
size_ratio 1 port 16 bits chip 8 bits
found 1 erase regions
erase region 0: 0x0200007f
erase_region_count = 128 erase_region_size = 131072
fwc addr ff000000 cmd f0 f0 8bit x 8 bit
Entering into First Write
First Write is done
flash_protect ON: from 0xFFFC0000 to 0xFFFEE8FF
protect on 126
protect on 127
flash_protect ON: from 0xFFFA0000 to 0xFFFBFFFF
protect on 125
16 MB
env_relocate[228] offset = 0x2000e000
env_relocate[249] malloced ENV at 1feca008
*** Warning - bad CRC, using default environment
In:    serial
Out:   serial
Err:   serial
U-Boot relocated to 1ffce000
Install interrupt vector 30
Install interrupt vector 31
### main_loop entered: bootdelay=20

$ flinfo
Bank # 1: CFI conformant FLASH (8 x 8)  Size: 16 MB in 128 Sectors
  AMD Standard command set, Manufacturer ID: 0x20, Device ID: 0x7E2101
  Erase timeout: 4096 ms, write timeout: 1 ms
  Buffer write timeout: 1 ms, buffer size: 64 bytes
  Sector Start Addresses:
  FF000000 E      FF020000 E      FF040000 E      FF060000 E      FF080000
E
  FF0A0000 E      FF0C0000 E      FF0E0000 E      FF100000 E      FF120000
E
  FF140000 E      FF160000 E      FF180000 E      FF1A0000 E      FF1C0000
E
  FF1E0000 E      FF200000 E      FF220000 E      FF240000 E      FF260000
E
  FF280000 E      FF2A0000 E      FF2C0000 E      FF2E0000 E      FF300000
E
  FF320000 E      FF340000 E      FF360000 E      FF380000 E      FF3A0000
E
  FF3C0000 E      FF3E0000 E      FF400000 E      FF420000 E      FF440000
E
  FF460000 E      FF480000 E      FF4A0000 E      FF4C0000 E      FF4E0000
E
  FF500000 E      FF520000 E      FF540000 E      FF560000 E      FF580000
E
  FF5A0000 E      FF5C0000 E      FF5E0000 E      FF600000 E      FF620000
E
  FF640000 E      FF660000 E      FF680000 E      FF6A0000 E      FF6C0000
E
  FF6E0000 E      FF700000 E      FF720000 E      FF740000 E      FF760000
E
  FF780000 E      FF7A0000 E      FF7C0000 E      FF7E0000 E      FF800000
E
  FF820000 E      FF840000 E      FF860000 E      FF880000 E      FF8A0000
E
  FF8C0000 E      FF8E0000 E      FF900000 E      FF920000 E      FF940000
E
  FF960000 E      FF980000 E      FF9A0000 E      FF9C0000 E      FF9E0000
E
  FFA00000 E      FFA20000 E      FFA40000 E      FFA60000 E      FFA80000
E
  FFAA0000 E      FFAC0000 E      FFAE0000 E      FFB00000 E      FFB20000
E
  FFB40000 E      FFB60000 E      FFB80000 E      FFBA0000 E      FFBC0000
E
  FFBE0000 E      FFC00000 E      FFC20000 E      FFC40000 E      FFC60000
E
  FFC80000 E      FFCA0000 E      FFCC0000 E      FFCE0000 E      FFD00000
E
  FFD20000 E      FFD40000 E      FFD60000 E      FFD80000 E      FFDA0000
E
  FFDC0000 E      FFDE0000 E      FFE00000 E      FFE20000 E      FFE40000
E
  FFE60000 E      FFE80000 E      FFEA0000 E      FFEC0000 E      FFEE0000
E
  FFF00000 E      FFF20000 E      FFF40000 E      FFF60000 E      FFF80000
E
  FFFA0000 E RO   FFFC0000   RO   FFFE0000   RO


Thanks & Regards,
Prakash