Reading Cortex-A9 CNTFRQ register using ARM Compiler 5 inline assembly

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  Martin Weidmann 9 months ago in reply to bsp_user +2 verified
  I started replying about named registers and then remembered... CNTFRQ is a Generic Timer register, which is an architectural extension to Armv7-A. The Cortex-A9 doesn't support that extension, so the...
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  Martin Weidmann 9 months ago +1 suggested
  If you just need to read the CNTFRQ register, defining a named register is probably the easiest way of doing this: https://developer.arm.com/documentation/dui0472/m/Compiler-specific-Features/Named...
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  Martin Weidmann 9 months ago in reply to bsp_user +1 verified
  bsp_user said: 1. I read below that cortex-a9 is armv7-a architecture. so why it lacks this register? Armv7-A supports a number of optional extensions (e.g. Virtualisation, Generic Timer, Large Physical...