Hello,
I'm having problems getting a program to run while my DSP is locked. I'm fairly new to DSPs and TI devices so forgive me if I'm asking something stupid.
I've got a program that I need to protect so I want to be able to lock the DSP using the CSM with a password. However, once I've programmed a password and locked the DSP, the program no longer runs after the device has been power cycled. As far as I can tell, everything is running from secure memory, but the program will only function when the device is unlocked.
I've started from some TI example linker files and have reallocated some blocks when I ran out of memory.
In order to run my program while the device is locked, do I need to run the whole program from flash memory? Any pointers would be greatly appreciated.
Many thanks
P.S. Linker code below:
MEMORY
{
PAGE 0: /* Program Memory */
/* Memory (RAM/FLASH/OTP) blocks can be moved to PAGE1 for data allocation */
ZONE0 : origin = 0x002000, length = 0x002000 /* XINTF zone 0 */
ZONE1 : origin = 0x004000, length = 0x002000 /* XINTF zone 1 */
RAML0 : origin = 0x008000, length = 0x001000 /* on-chip RAM block L0 */
ZONE2 : origin = 0x080000, length = 0x080000 /* XINTF zone 2 */
ZONE6 : origin = 0x100000, length = 0x080000 /* XINTF zone 6 */
OTP : origin = 0x3D7800, length = 0x000800 /* on-chip OTP */
FLASHE : origin = 0x3E8000, length = 0x004000 /* on-chip FLASH */
FLASHD : origin = 0x3EC000, length = 0x004000 /* on-chip FLASH */
FLASHC : origin = 0x3F0000, length = 0x004000 /* on-chip FLASH */
FLASHA : origin = 0x3F6000, length = 0x001F80 /* on-chip FLASH */
CSM_RSVD : origin = 0x3F7F80, length = 0x000076 /* Part of FLASHA. Program with all 0x0000 when CSM is in use. */
BEGIN : origin = 0x3F7FF6, length = 0x000002 /* Part of FLASHA. Used for "boot to Flash" bootloader mode. */
CSM_PWL : origin = 0x3F7FF8, length = 0x000008 /* Part of FLASHA. CSM password locations in FLASHA */
/* ZONE7 : origin = 0x3FC000, length = 0x003FC0 /* XINTF zone 7 available if MP/MCn=1 */
ROM : origin = 0x3FF000, length = 0x000FC0 /* Boot ROM available if MP/MCn=0 */
RESET : origin = 0x3FFFC0, length = 0x000002 /* part of boot ROM (MP/MCn=0) or XINTF zone 7 (MP/MCn=1) */
VECTORS : origin = 0x3FFFC2, length = 0x00003E /* part of boot ROM (MP/MCn=0) or XINTF zone 7 (MP/MCn=1) */
PAGE 1 : /* Data Memory */
/* Memory (RAM/FLASH/OTP) blocks can be moved to PAGE0 for program allocation */
/* Registers remain on PAGE1 */
RAMM0 : origin = 0x000000, length = 0x000400 /* on-chip RAM block M0 */
RAMM1 : origin = 0x000400, length = 0x000400 /* on-chip RAM block M1 */
RAML1 : origin = 0x009000, length = 0x001000 /* on-chip RAM block L1 */
FLASHB : origin = 0x3F4000, length = 0x002000 /* on-chip FLASH */
RAMH0 : origin = 0x3F8000, length = 0x002000 /* on-chip RAM block H0 */
}
/* Allocate sections to memory blocks.
Note:
codestart user defined section in DSP28_CodeStartBranch.asm used to redirect code
execution when booting to flash
ramfuncs user defined section to store functions that will be copied from Flash into RAM
*/
SECTIONS
{
/* Allocate program areas: */
.cinit : > FLASHE PAGE = 0
.pinit : > FLASHA, PAGE = 0
.text : > FLASHE PAGE = 0
codestart : > BEGIN PAGE = 0
ramfuncs : LOAD = FLASHD,
RUN = RAML0,
LOAD_START(_RamfuncsLoadStart),
LOAD_END(_RamfuncsLoadEnd),
RUN_START(_RamfuncsRunStart),
PAGE = 0
csmpasswds : > CSM_PWL PAGE = 0
csm_rsvd : > CSM_RSVD PAGE = 0
/* Allocate uninitalized data sections: */
.stack : > RAML1 PAGE = 1
.ebss : > RAML1 PAGE = 1
.esysmem : > RAML1 PAGE = 1
/* For SDFlash to program these, they must be allocated to page 0 */
.econst : > FLASHD PAGE = 0
.switch : > FLASHA PAGE = 0
/* Allocate IQ math areas: */
IQmath : > FLASHC PAGE = 0 /* Math Code */
IQmathTables : > ROM PAGE = 0, TYPE = NOLOAD /* Math Tables In ROM */
/* .reset is a standard section used by the compiler. It contains the */
/* the address of the start of _c_int00 for C Code. /*
/* When using the boot ROM this section and the CPU vector */
/* table is not needed. Thus the default type is set here to */
/* DSECT */
.reset : > RESET, PAGE = 0, TYPE = DSECT
vectors : > VECTORS PAGE = 0, TYPE = DSECT
}
