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TMS570LS3137 / HALCoGen 4.00 PMU Initialization

Charles Johnston
Expert 2690 points
Other Parts Discussed in Thread: HALCOGEN

Hello,

The function _pmuInit_ in the file sys_pmu.asm contains the following:

        ; clear flags
        mov   r0,  #0
        sub   r1,  r1,  #1
        mcr   p15, #0, r0, c9, c12, #3

Why is r1 decremented?  It is not used in the function, nor is it saved/restored. Can I remove the line containing the sub?

Thanks, Charlie Johnston

  • 0
    TI__Mastermind 22375 points

    Charles,

    This is a good catch. In fact the code is incorrect and should be:

            ; clear flags
        mov   r0,  #0
        sub   r0,  r0,  #1
        mcr   p15, #0, r0, c9, c12, #3

    Here is an extract from the Cortex R4 TRM:

    The flags are cleared by writing 1.

    I will inform our Halcogen team to fix this problem.