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Blocked using Trace32 u-boot debugging and problem with hardware breakpoint

Question asked by vinothkumar s on Jan 23, 2019
Latest reply on Feb 2, 2019 by vinothkumar s

Hi All,


We are debugging u-boot using trace32 on our new processor board with an T4240RDB.


We are currently blocked in our development. We are having problems with Trace32 debugger

hardware breakpoints


Here the situation:

    We understand that in order to get hardware breakpoints to work we need:

   1- A valid address with a valid instruction at IPVR

   2- DE bit enable in MSR register

   3- To avoid problems; always set breakpoints before or after code which accesses SRR0 and SRR1, and never step         through such code.


We have also verify that:

  • Address Space is 1 (MSR IS and DS are both set to 1),
  • Debug interrupt is enable (MSR DE is 1), and
  • The effect of the TLB update is visible (rfi instruction should cause this to occur).




        lis     r6,MSR_IS|MSR_IS|MSR_DS|MSR_IS|MSR_DE@h

        ori     r6,r6,MSR_IS|MSR_IS|MSR_DS|MSR_IS|MSR_DE@l

        lis     r7,switch_as@h

        ori     r7,r7,switch_as@l


        mtspr   SPRN_SRR0,r7

        mtspr   SPRN_SRR1,r6




After rfi instruction, jump to 0xEFFFF574 but, there is no data present and also all address same like that (data :??????????????)


Thank you,