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I recently work on Tricore Processor, but I have some problems. With reading memory value. I do not know if I am right or not, but I think a part of flash memory copied to RAM and now in my algorithm used of RAM cell. I have shown Code in below:

ld32.a          a15, [a0]-0x7BA4 ; a0 = 0xD00032E0

As you see, a15 is an address that point to a constant value(store in RAM or FLASH) and a0 is the base address of RAM memory. To calculate a15, I subtract a0 from 0x7BA4 but the result is 0xCFFFB73C. This Address is not a valid address of RAM.
EDITED:
I saw a freaky sentence in Tricore document.(I have shown in below) enter image description here
As you see, A[0] can be protected by user application.
Could it be protected in this case as well?
What is my wrong? What should I do? How can I get the correct value of a15?

  • did you find where a0 is initialized? Maybe it's not 0xD00032E0. – Igor Skochinsky Dec 22 '20 at 8:43
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It seems the address falls into the Scratchpad RAM region, so it’s probably initialized somewhere else. Try to look for references to C4000000 or C8000000, or other occurrences of -0x7BA4 - maybe you’ll find the place where the variable is written to.

Scratchpad RAM memory map

  • ♦ Interesting. I've never given it much thought. I edited my question. Maybe it will help us to solve the problem. – Unicornux Dec 22 '20 at 5:20

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