[U-Boot-Users] Verify CRC on environment?
Hi,
(how) can I verify the CRC of the environment using the crc32 command?
I am using CFG_ENV_ADDR_REDUND, so I guess I have to skip 5 bytes of header. Do the two last 0x00 count?
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... :-(
In message 42943EDA.7020404@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
Wolfgang Denk wrote:
In message 42943EDA.7020404@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.
Hmm. But after the two last 0x00 there's "garbage" in the flash, i.e. old, overwritten and erased values. So the count as well?
-- Steven
In message 429441EA.60203@imc-berlin.de you wrote:
Hmm. But after the two last 0x00 there's "garbage" in the flash, i.e. old, overwritten and erased values. So the count as well?
Yes.
Best regards,
Wolfgang Denk
participants (2)
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Steven Scholz -
Wolfgang Denk