[U-Boot-Users] Verify CRC on environment?

[Wolfgang Denk]

In message <42943EDA.7020404 at imc-berlin.de> you wrote:
> 
> (how) can I verify the CRC of the environment using the crc32 command?

=> help crc

> I am using CFG_ENV_ADDR_REDUND, so I guess I have to skip 5 bytes of header.

Right.

> Do the two last 0x00 count?

Yes. As does all the rest of the configured CFG_ENV_SIZE

> My environment is at 10030000:
> 
> 10030000: 4c 16 71 5f 00 62 6f 6f 74 64 65 6c 61 79 3d 30
> 10030010: 00 62 61 75 64 72 61 74 65 3d 31 31 35 32 30 30
> 10030020: 00 73 65 72 69 61 6c 23 3d 31 32 38 33 30 30 00
> 10030030: 73 74 64 69 6e 3d 73 65 72 69 61 6c 00 73 74 64
> 10030040: 6f 75 74 3d 73 65 72 69 61 6c 00 73 74 64 65 72
> 10030050: 72 3d 73 65 72 69 61 6c 00 00 3d 73 65 72 69 61
> 10030060: 6c 00 00 64 65 72 72 3d 73 65 72 69 61 6c 00 00
> 10030070: 74 64 65 72 72 3d 73 65 72 69 61 6c 00 00
> 
> That 0x7D, so 125+1 = 126 bytes
> 
> So I thought I have to calculate the crc over 126 - 5 = 0x79 bytes
> 
> crc32 10030005 0x79
> CRC32 for 10030005 ... 1003007d ==> 8889f3af
> 
> But this is obviously wrong... :-(

Yes, this is wrong. You must use "CFG_ENV_SIZE - 5" as length for the
crc command.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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