Is it possible to access the device serial number or any identifier unique to the device?
you didnt say which Blackfin variant you're interested in, but your tag says "BF538", so the answer there is that there is no device serial number.
Blackfin parts that have OTP (like the BF51x/BF52x/BF54x) come out of the factory with a unique ID programmed in it, but parts that lack OTP (like all BF53x/BF56x parts) do not have any unique IDs in them. you'll have to program your own and store it yourself in some non-volatile storage. the BF538F does include parallel flash in the package ...
Thank you for your helpful answer.
I am using the onboard flash, it's just that I'm going to have a large array of processors and didn't want to have to remember to flash them all with unique id's.
Retrieving data ...