The device can be secured by adding a Non-Volatile System Censorship Information (NVSCI) record to the DCF record list in the UTEST Flash block.
A value of 55AAh in the censorship control word of the NVSCI record determines that the device is unsecured, any other value determines that the device is secured.
Censoring the device (example for lauterbach script)
1. Program NVSCI DCF record to first available space in UTEST memory.
data.set 0x00400308 %QUAD 0x55AA12340100000C ;NVSCI - Censorship Control enabled
2. Program Censorship password (0x1234567812345678)
data.set 0x00400310 %QUAD 0x1234567801000004 ;NVPWDL
data.set 0x00400318 %QUAD 0x1234567801000008 ;NVPWDH
3. Perform reset
Now the device is censored and JTAG PASSWORD must be inserted in order to work with JTAG.
Lauterbach -> sys.option.keycode 0x1234567812345678
sys.attach
sys.break
The device is now accessible trough JTAG.
" After every reset the JTAG PASSWORD key must be reentered on censored device "
Uncensoring device:
data.set 0x004003018 %QUAD 0x55AA55AA0100000C ;NVSCI - Censorship Control disabled
NOTE:
Peter
Original Attachment has been moved to: MPC5744P_DCF_Censorship.cmm.zip
