Partitioning NAND flash

I am having trouble determining where the partitioning information is coming from when I boot into linux 2.6.26 for my haleakala reference board from amcc. When linux boots I receive the following output from the MTD driver:

fc000000.nor_flash: Found 1 x16 devices at 0x0 in 16-bit bank
Amd/Fujitsu Extended Query Table at 0x0040
fc000000.nor_flash: CFI does not contain boot bank location. Assuming top.
number of CFI chips: 1
cfi_cmdset_0002: Disabling erase-suspend-program due to code brokenness. RedBoot partition parsing not available
Creating 5 MTD partitions on "fc000000.nor_flash":
0x00000000-0x001e0000 : "kernel"
0x001e0000-0x00200000 : "dtb"
0x00200000-0x00f60000 : "root"
0x03f60000-0x03fa0000 : "env"
0x03fa0000-0x04000000 : "u-boot"
NDFC NAND Driver initialized. Chip-Rev: 0x00000111
NAND device: Manufacturer ID: 0xec, Chip ID: 0x76 (Samsung NAND 64MiB 3,3V 8-bit)
Scanning device for bad blocks
Number of partitions 3
Creating 3 MTD partitions on "NAND 64MiB 3,3V 8-bit":
0x00000000-0x00060000 : "u-boot"
0x00060000-0x00068000 : "env"
0x00068000-0x04000000 : "content"

My problem is that I want to repartition the NAND flash, but am not sure where the current partitioning scheme is coming from. My bootargs to the kernel does not contain an mtdparts section and i don't see any reference to a "u-boot", "env", "content" partition in the mtd driver code itself.

I have setup my NOR partitioning by modifying the DTS provided by the linux source, but there is nothing in there that refers to the NAND chip. I have tried providing an mtdparts argument to the kernel but this appears to be a no-op even though the appropriate option in the kernel is configured.

I'm kind of at a loss after monkeying with this for the last couple days. Any help or direction to a good source of information would be greatly appreciated!

Brian Szmyd | [email protected]

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It should problably be positioned in your board spesific code then.
Search for use of:
static struct mtd_partition
This is used for both the nand and the nor flash and contains the partitions ( in my cases anyway ) ( typical place could be arch/"cpu_type"/ )

Regards
Eirik Aanonsen

Perfect! I would have never thought to look there for MTD partitioning structs but I guess it makes sense. For those who care, the relevant files is: arch/powerpc/platforms/40x/kilauea-nand.c

Much appreciated Eirik!

Brian Szmyd | [email protected]

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The information contained in this transmission may be confidential. Any disclosure, copying, or further distribution of confidential information is not permitted unless such privilege is explicitly granted in writing by Quantum Corporation. Furthermore, Quantum Corporation is not responsible for the proper and complete transmission of the substance of this communication or for any delay in its receipt.
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The NOR flash maps are located in drivers/mtd/maps and NAND maps are in drivers/mtd/nand. Map defines how flash is partitioned. The information can be static or from kernel cmdline or from redboot partition. Parsing of cmdline and reboot part. must be enabled in kernel before using.

It is possible that parsing of cmdline for MTD is disabled. Do you have /proc/config.gz on your system? Grep for 'MTD_'.

Look at the boards in drivers/mtd/maps, there a lot of examples on how to make a mtd map.

HTH,
Hinko

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