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Acorn Arcade forums: Programming: CPU identification
 
  CPU identification
  Phlamethrower (10:30 3/2/2007)
  jmb (13:30 3/2/2007)
    Phlamethrower (13:44 3/2/2007)
 
Jeffrey Lee Message #98044, posted by Phlamethrower at 10:30, 3/2/2007
PhlamethrowerHot Hot Hot Hot Hot Hot Hot Hot Hot Hot Hot Hot Hot stuff

Posts: 15100 		I'm trying to use MRC to get the CPU ID (CP15 register 0). But on both my Iyonix and my StrongARM, I'm getting an unidentified instruction error :(

I'm using MRC P15,0,R0,C0,C0,0 to read the ID into R0, as dictated by application note 99. as compiles this to 0xEE100F10, which looks like the right opcode to me, and the OS disassembler annotates it as an instruction to read the CPU ID. But it doesn't seem to work.

Is the instruction/opcode wrong? Is there some caveat I've missed which says it can't be used in user mode? Is the moon made of cheese?

Help!
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JMB Message #98056, posted by jmb at 13:30, 3/2/2007, in reply to message #98044
Member
Posts: 467
Is there some caveat I've missed which says it can't be used in user mode?
Yes ;)
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Jeffrey Lee Message #98057, posted by Phlamethrower at 13:44, 3/2/2007, in reply to message #98056
PhlamethrowerHot Hot Hot Hot Hot Hot Hot Hot Hot Hot Hot Hot Hot stuff

Posts: 15100 		Yay! It works properly now :)

Thanks, JMB.
Thmb.
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Acorn Arcade forums: Programming: CPU identification