software reset to on-chip bootloader

John Fisher

I would expect from TI doc plus discussions in this forum, that the following code would serve to reset a C55x into the on-chip boot loader

        asm(" BSET INTM");
        CSL_CPU_REGS->IVPD = 0xFFFF;
        CSL_CPU_REGS->IVPH = 0xFFFF;
        asm(" RESET;");

However this doesn't appear to be the case. I and a colleague have tested this independently on different hardware designs and no common software. Mine on a 5504, my colleague on a 5505

I have checked the register values modified in the code above using an emulator at a breakpoint on the reset instruction. I also checked MPNMC is 0. I then burnt the software to flash and ran it. Does not reboot.

What we are missing?

over 12 years ago

0 Bill Finger over 12 years ago

Genius 3735 points

John,

The software reset performs differently from the hardware reset (or from power-up), so I always use a hardware reset. To get a hardware reset, I use the watchdog timer and set it to timeout in zero seconds. This always works, on every platform.

Bill

0 John Fisher over 12 years ago in reply to Bill Finger

Expert 1030 points

I suspect that support for the procedure I quote above has been removed from the C5504/05/14/15 family. It works on yet another hardware platform we have that uses the C5507.

0 John Fisher over 12 years ago in reply to John Fisher

Expert 1030 points

@Bill, unfortunately because of a hardware design issue, we have to use a software reset until next hardware rev.

Processors

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software reset to on-chip bootloader