TMS320F28388S: Customized boot and app

Hi,

Customer is doing their own boot and app. Now we face one problem, when jump from boot to app, the app doesn't run with illegal interrupt.

What could be the issue.

Here's the configure and test:

1) cmd for boot:

BEGIN : origin = 0x080000, length = 0x000002
FLASH0 : origin = 0x080002, length = 0x001FFE
RESET : origin = 0x3FFFC0, length = 0x000002
codestart : > BEGIN, ALIGN(8)

2) cmd for app:

BEGIN : origin = 0x080000, length = 0x000002
BOOTS : origin = 0x088000, length = 0x000002
FLASH4 : origin = 0x088002, length = 0x001FFE
RESET : origin = 0x3FFFC0, length = 0x000002
codestart : > BEGIN, ALIGN(8)
bootstart : > BOOTS, ALIGN(8)

3) Codestartbranch.asm:

wd_disable:
SETC OBJMODE ;      Set OBJMODE for 28x object code
EALLOW ;                    Enable EALLOW protected register access
MOVZ DP, #7029h>>6 ;      Set data page for WDCR register
MOV @7029h, #0068h ;     Set WDDIS bit in WDCR to disable WD
EDIS ;                                  Disable EALLOW protected register access
LB _c_int00 ;                       Branch to start of boot._asm in RTS library

or:

LB 0x88000 ;                       Branch to start of boot._asm in RTS library

4) Flash ECC enable and disable are both tried, app doesn't work;

5) If download the app, without boot, app can work.

6) we did the same thing on F28377S, it works.

7) Flash app program data read and compared, they are totally the same. One is programmed through user boot, while the other is programmed through jtag (without boot).

Thanks a lot.

Br, Jordan