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i am using arm-linux-gnueabi-gcc cross copiler for arm but i am not able to select different architecture of this processor. can anyone help me to choose raspberry pi architecture

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The one that comes stock on most mainstream linux distros targets ARMv7, and so should be okay for compiling code to run on a Pi 2/3 -- although if you are using Raspbian, the fact that it is compiled for ARMv6 may complicate this (but I don't think that is the case).

If you are using any other model, i.e., the original A/B, the A+/B+, or the zero, then you cannot use that compiler and will have to download or build one yourself (I recommend crosstool-ng for this purpose as doing it from scratch is quite a task; you will find various tutorial etc. involving ct-ng and that Pi, including here).

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