[U-Boot] fw_printenv & fw_setenv for NAND partition

[Amarendra Reddy]

Hi All,

Thanks in Advance.
Please clarify the following.
We are using ARM9 core Samsung controller with NAND Flash & U-Boot bootloader.


è There is a partition mtd1 in NAND containing the environment variables

mtd1: 00080000 00020000 "NVRAM"

è The size of mtd1 is 512 KB. Basically mtd1 contains 4 Blocks. Each Block is 128KB.

è The size of environment variables in 8KB.

è But this mtd1 has 4 redundant copies of environment variables .

è Block1 contains first copy of environment variables. This occupies only 8KB of Block1.

è Similarly Block2, Block3, Block4 each contain a copy of environment variables.

I am planning to use fw_printenv & fw_setenv in Linux to access U-Boot variables.

Question:
Does the below fw_env.config  configuration hold good ?

fw_env.config
# Configuration file for fw_(printenv/saveenv) utility.
# Up to two entries are valid, in this case the redundand
# environment sector is assumed present.

# MTD device name       Device offset   Env. size       Flash sector size
/dev/mtd1               0x00000         0x02000         0x20000
/dev/mtd1               0x20000         0x02000         0x20000
/dev/mtd1               0x40000         0x02000         0x20000
/dev/mtd1               0x60000         0x02000         0x20000



Extra Info:
MTD1 starts at 768 KiB as shown below.

CC9M2443 # flpart
Nr | Name           |  Start     | Size       | Type         | FS    | Flags
----------------------------------------------------------------------------
0 | U-Boot         |          0 |    768 KiB | U-Boot       |       | fixed
1 | NVRAM          |    768 KiB |    512 KiB | NVRAM        |       | fixed
2 | Kernel         |   1280 KiB |      3 MiB | Linux-Kernel |       |
3 | Rootfs-Jffs2 |   4352 KiB |     30 MiB | Filesystem   | JFFS2 | rootfs


Thanks & Regards
Amarendra Reddy


Larsen & Toubro Limited

www.larsentoubro.com

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