Qorivva MPC5xxx/SPC5xx Debugger and NEXUS Trace
47
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The core can be halted at power-on reset either through menu or by calling a script:
Using either method, a dialog will appear to guide you through the target power cycle. Here’s a full example
using the method 2 from above chapter:
In order to successfully recover a censored processor, it is particularly essential to find a good value for
<delay>
. If the time is too short, the debugger sends the debug request before the unlock took place.
However is the time is too long, the processor may execute the problematic code before the debug request
can halt the core. It is recommended to find a suitable timing using a good target before trying recovery. The
<delay>
parameter of SYStem.Option.WaitReset accepts time values in µs resolution.
Method
Action
Menu
Click on MPC5XXX (or SPC5XX), select Tools - Halt core at power-on
reset
Script
DO ~~/demo/powerpc/etc/standby/haltatpoweronreset.cmm
SYStem.CPU <cpu>
CORE.ASSIGN <cores>
SYStem.Option KEYCODE <password>
SYStem.Option ResBreak OFF
SYStem.Option WaitReset <delay> default
SYStem.Option ResetMode PIN
DO ~~/demo/powerpc/etc/standby/haltatpoweronreset.cmm
