Posted on May 17, 2011 at 14:14In the USB demo firmware from Stmicro, I can see that the USB serial number is built from the content of the memory locations at 1FFFF7E8, 1FFFF7EC and 1FFFF7F0, at the end of the system memory. My guess is that these locations hold a serial number unique for each chip. Since this not documented, can somebody confirm it?
Like in the TRM?
29.2 Unique device ID register (96 bits)
The unique device identifier is ideally suited:
�? for use as serial numbers (for example USB string serial numbers or other end
applications)
�? for use as security keys in order to increase the security of code in Flash memory while
using and combining this unique ID with software cryptographic primitives and
protocols before programming the internal Flash memory
�? to activate secure boot processes, etc.
The 96-bit unique device identifier provides a reference number which is unique for any
device and in any context. These bits can never be altered by the user.
The 96-bit unique device identifier can also be read in single bytes/half-words/words in
different ways and then be concatenated using a custom algorithm.
Base address: 0x1FFF F7E8
Address offset: 0x00
Read only = 0xXXXX where X is factory-programmed
