The m command allows you to view a dump of memory.
This command has two formats:
m start end
m start+length
Using the first format you provide the start and end addresses that you want to inspect; for example:
m 81240000 8124003F
Using the second form you provide the start address and the number of bytes to dump (in hex); for example:
m 81240000 +40
Both of the above examples dump 64 bytes from address 0x81240000. The output is a standard hex-dump:
.m 81240000 +40
81240000: 00 00 FF EB 08 01 BF D7 00 04 7D B6 02 00 BF EF ..........}.....
81240010: 00 01 DF EE 0A 40 7F F7 00 80 BF FF 20 10 FF EA .....@...... ...
81240020: 00 82 FF 77 04 24 FD FF 40 01 FF 7F 00 01 FF FF ...w.$..@.......
81240030: 08 10 FF BF 08 00 BF DE 08 00 EF FB 00 00 FF DF ................