TMS570LC4357: Proper c_int00 initialization with a separate bootloader and application

jimj2713

Part Number: TMS570LC4357

I got back to this bootloader, and I believe it is almost working -- except if there is a watchdog reset; the bootloader data-aborts after this reset. The example code calls getResetSource() and for a WATCHDOG_RESET, the switch statement just breaks. Why would these functions be skipped on a watchdog-reset (aren't all registers set to default after this reset)?

My solution was to change both the bootloader and application c_int00 to remove the switch and always follow the EXT_RESET path, which is the same as POWERON_RESET except the call to errata_SSWF021... So these 2 c_int00 calls call the same set of functions:

_memInit_();

_coreEnableEventBusExport_();

systemInit();

_coreEnableIrqVicOffset_();

vimInit();

esmInit();

This works, but do you see any problem with calling these functions twice every boot?

Thanks,

Jim

over 4 years ago

0 Chester Gillon over 4 years ago

Guru 92251 points

jimj2713 said:
I got back to this bootloader, and I believe it is almost working -- except if there is a watchdog reset; the bootloader data-aborts after this reset.

Not sure if the fix in TMS570LC4357: Data abort exception after software reset will help.

0 jimj2713 over 4 years ago in reply to Chester Gillon

Expert 2385 points

Chester,

Thanks that is consistent with my changes. My other question is I have a separate bootloader and application, so I have 2 c_int00 functions. Currently they are identical in that they call all of these init-functions twice. Do you see any problem with this approach?

Thanks again,

Jim

+1 QJ Wang over 4 years ago in reply to jimj2713

TI__Guru**** 198726 points

Hi Jim,

It is ok for BL and Application to have identical _c_int00().

The application doesn't have to perform PBIST, memory Init, CPU self-test, and system init if application uses the same PLL settings.

Arm-based microcontrollers

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TMS570LC4357: Proper c_int00 initialization with a separate bootloader and application