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

bsp_user

Hi,

Can I get an example of reading the CNTFRQ register in cortex-a9 using assembly inline of arm compiler 5 (DS built in) ?

I didn't find anywhere...

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  • +1 in reply to bsp_user
    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 Addresses...).  Not all Armv7-A processors will support all of the extensions.

    You can check a processor's TRM to see which extensions are implemented, and the information is also reported via feature registers in the processor.

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  • +1 in reply to bsp_user
    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 Addresses...).  Not all Armv7-A processors will support all of the extensions.

    You can check a processor's TRM to see which extensions are implemented, and the information is also reported via feature registers in the processor.

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