Kontron COMe-cP2020 - Manual (Page 84)

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COMe-P2020 User Guide
84
Table 6-5: md5sum Command
md5 sum Creates or checks the md5 message digest over a memory area
SYNTAX: md5sum <data-address> <length> [<cksum-address>]
md5sum command
<data-address> parameter: hexadecimal
start address of memory area
<length> parameter: hexadecimal
length of memory area
<cksum-address> parameter: hexadecimal
If present: compares the calculated md5 message digest with the md5 message
digest available at this address.
If absent: calculates the md5 message digest over the specified memory range and
prints it to the console.
DESCRIPTION: This command is used to create or check the md5 message digest over a memory area.
If the optional 3 rd parameter <checksum-address> is omitted, the md5 message digest is calculated over
the specified memory range and printed to the console.
If the optional 3 rd parameter <cksum-address> is specified, the md5 message digest is calculated over the
specified memory range and compared with the md5 message digest at <cksum-address>. If the digest is
identical, the command returns 0; if the digests do not match, a value other than zero is returned. When a
comparison is made, nothing is printed to the console since this usage of the command is meant to be used
within scripts.
The md5 message digest at <cksum-address> may be specified in ASCII or binary format.
USAGE: 1. Calculate an md5 message digest:
=> md5sum 100000 80000
8fe7006660a2df2265b7cd707eb98786
=>
2. Check the md5 message digest of a file previously loaded to 100000 with a size of 80000 and its md5
message digest loaded to 10000 in a script
=> setenv check_crc “if md5sum 100000 80000 10000; then echo ‘md5
message digest OK’; else echo ‘md5 message digest BAD’; fi”
=>run check_crc
md5 message digest OK
=>