Memory map, password handling for TI TMS320F281x DSP's on SPRINT

Applicable for:
 - TMS320F2810
 - TMS320F2811
 - TMS320F2812


Memory map:
-----------
Sprint uses the native memory map of TMS320F281x devices, 
however Sprint's memory is byte oriented instead of words.
For that the 4MB x 16 DSP address range corresponds in Sprint to 8 MB x 8.

                    F281x Memory           <--->    Sprint's Memory
                                             |     
    Address range :  0x00 0000 - 0x3F FFFF   |   0x00 0000 - 0x7F FFFF
                                             |
    Key Registers :  0x00 0AE0 - 0x00 0AE7   |   0x00 15C0 - 0x00 15CF
                                             |
    OTP           :  0x3D 7800 - 0x3D 7BFF   |   0x7A F000 - 0x7A F7FF
    FLASH-F2811/12:  0x3D 8000 - 0x3F 7FFF   |   0x7B 0000 - 0x7E FFFF
    FLASH-F2810   :  0x3E 8000 - 0x3F 7FFF   |   0x7D 0000 - 0x7E FFFF
    PWL           :  0x3F 7FF8 - 0x3F 7FFF   |   0x7E FFF0 - 0x7E FFFF

You should use TI's HEX-Conversion utility to convert your COFF-object file
into one of several standard ASCII hexadecimal formats suitable for loading into Sprint.
E.g.: 
  hex2000 -romwidth 16 -i -byte file.out
will covert the COFF file file.out into byte oriented Intel-HEX format. 

Per default both OTP and FLASH memory will be programmed, however, 
the address range setting can restrict programming to one block.
Note: complete blocks can be selected only.

Code Security Module:
---------------------
The code security module (CSM) is a security feature incorporated in 28x devices.
It prevents access/visibility to on-chip memory (a.o. FLASH, OTP) to unauthorized
persons; i.e. it prevents duplication/reverse engineering of proprietary code.

Security is protected by a password of 128-bit data (eight 16-bit words) that
is used to secure or unsecure the device.
Passwords are stored in code security password locations (PWL) in flash memory. 

In order to read or erase a secured device you have to enter the password keys
at the KEY register addresses. A wrong security key will result in an error.

In flash devices, the password can be changed anytime if the old password is known.

CAUTION!!! 
 ->  For reprogrammability it is essentially to save the security key.  <- 

For code security operation, all addresses between 0x3F7F80 and 0x3F7FF5 
(0x7E FF00 - 0x7E FFEA in Sprint) must be programmed to 0x0000 when the 
Code Security Passwords are programmed. If security is not a concern, 
then these addresses can be used for code or data.

  !!!!!!!!!!!!!!!!!!!          CAUTION !         !!!!!!!!!!!!!!!!!!!!
  !!!                                                             !!! 
  !!! If the password locations has been programmed with all 0's, !!!
  !!! the device is secured forever, it can not be reprogrammed!  !!!
  !!! Do not use all zeros as a password.                         !!!
  !!!                                                             !!!
  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!