diff options
Diffstat (limited to 'doc/README.nand')
| -rw-r--r-- | doc/README.nand | 29 |
1 files changed, 17 insertions, 12 deletions
diff --git a/doc/README.nand b/doc/README.nand index 5279a4f..b5171f4 100644 --- a/doc/README.nand +++ b/doc/README.nand @@ -34,14 +34,19 @@ Commands: nand device num Make device `num' the current device and print information about it. - nand erase off size - nand erase clean [off size] - Erase `size' bytes starting at offset `off'. Only complete erase - blocks can be erased. + nand erase off|partition size + nand erase clean [off|partition size] + Erase `size' bytes starting at offset `off'. Alternatively partition + name can be specified, in this case size will be eventually limited + to not exceed partition size (this behaviour applies also to read + and write commands). Only complete erase blocks can be erased. + + If `erase' is specified without an offset or size, the entire flash + is erased. If `erase' is specified with partition but without an + size, the entire partition is erased. If `clean' is specified, a JFFS2-style clean marker is written to - each block after it is erased. If `clean' is specified without an - offset or size, the entire flash is erased. + each block after it is erased. This command will not erase blocks that are marked bad. There is a debug option in cmd_nand.c to allow bad blocks to be erased. @@ -51,28 +56,28 @@ Commands: nand info Print information about all of the NAND devices found. - nand read addr ofs size + nand read addr ofs|partition size Read `size' bytes from `ofs' in NAND flash to `addr'. If a page cannot be read because it is marked bad or an uncorrectable data error is found the command stops with an error. - nand read.jffs2 addr ofs size + nand read.jffs2 addr ofs|partition size Like `read', but the data for blocks that are marked bad is read as 0xff. This gives a readable JFFS2 image that can be processed by the JFFS2 commands such as ls and fsload. - nand read.oob addr ofs size + nand read.oob addr ofs|partition size Read `size' bytes from the out-of-band data area corresponding to `ofs' in NAND flash to `addr'. This is limited to the 16 bytes of data for one 512-byte page or 2 256-byte pages. There is no check for bad blocks or ECC errors. - nand write addr ofs size + nand write addr ofs|partition size Write `size' bytes from `addr' to `ofs' in NAND flash. If a page cannot be written because it is marked bad or the write fails the command stops with an error. - nand write.jffs2 addr ofs size + nand write.jffs2 addr ofs|partition size Like `write', but blocks that are marked bad are skipped and the is written to the next block instead. This allows writing writing a JFFS2 image, as long as the image is short enough to fit even @@ -80,7 +85,7 @@ Commands: produced by mkfs.jffs2 should work well, but loading an image copied from another flash is going to be trouble if there are any bad blocks. - nand write.oob addr ofs size + nand write.oob addr ofs|partition size Write `size' bytes from `addr' to the out-of-band data area corresponding to `ofs' in NAND flash. This is limited to the 16 bytes of data for one 512-byte page or 2 256-byte pages. There is no check |