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Porting code From Cortex-A9 to Cortex-R7

Ajeesh over 9 years ago

Hi,

I have some bare metal code written for Arm cortex A9. I would like to port this code to cortex R7. Since both of them belong to ARMv7, How much effort will this take?

I have never worked on cortex R processors. Will i be able to use the same assembly code? What changes am i to expect?

Regards,

Ajeesh

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+1 Peter Rielly over 9 years ago

Ditto to daith; the other thing that will standout is the R7's lack of Trustzone. So any TZ specific core and/or GIC initialization will need to be altered.

Other than that the programmer's model and instruction set are compatible with A9.
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+1 Peter Rielly over 9 years ago

Ditto to daith; the other thing that will standout is the R7's lack of Trustzone. So any TZ specific core and/or GIC initialization will need to be altered.

Other than that the programmer's model and instruction set are compatible with A9.
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0 Ajeesh over 9 years ago in reply to Peter Rielly

Hi,
Thanks for the reply.
I am not using any Trust zone features and also i am not using any Memory protection unit. What are changes in GIC initialization am i to expect. I have used GICv2 in my code. As per my understanding i might need only to change the GIC initialization if i am using GICv1 or GICv3. Am i correct?

regards,
Ajeesh
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