Hi Martin,
As I can see you have a 16MB device. However you are attempting to write
0x2000000 bytes (i.e 32 MB).
Try to use the size reported by the tftp command at the end of its
execution.
If you have built the image according to NAND's metrics (i.e page size,
erase block size), then the reported image' size will be successfully
page-aligned
and there won't be problems when writing the image to flash.
I cannot help you with the unlock issue. However, ignore it so far
and try to write
a correct amount of data to NAND flash.
I guess you are probably using JFFS2 and mkfs.jffs2 tool to build the
image: it's crucial
to specify the target NAND's metrics in the command line, in order to
build a correctly page-aligned
image (check the mkfs.jffs2 man pages). Also remember to indicate to
mkfs.jffs2
that your target machine is big endian.
Hope this helps,
Claude
>>I am having trouble writing to NAND flash from u-boot
>>-> nand info
>>Device 0: NAND 16MiB 3.3V 8-bit, sector size 16KiB
>>-> nand device
>>Device 0: NAND 16MiB 3.3V 8-bit
>>I then moved the uClinux image to RAM:
>>-> tftp 0x40800000 uImage
>>Verified that the image is there:
>>-> md 0x40800000
>>Attemped to erase NAND flash:
>>-> nand erase
>>...it seemed to work
>>Attempted to write the image and this is what I got:
>>-> nand write 0x40800000 0x0 0x2000000
>>NAND write: device 0 offset 0x0, size 0x200000 0 bytes written: ERROR
>>I tried to see if the device happened to be locked and this is
what I saw:
>>-> nand unlock
device 0 whole chip
>>nand_unlock: start: 00000000, length: 16777216!
>>nand_unlock: Device is write protected!
>>Error unlocking NAND flash, write and erase will probably fail
>>It says that the device is write-protected.
>>I checked the schematics and verified that the write_protect pin is
>>pulled-up, which would make it writable. Not sure how it is that
it is
>>coming-up write protected or how I can change that. I'd
appreciate a shove
>>in the right direction.
>>Thanks,
>>-Martin
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