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docs: Update instructions to download Corstone-310 FVP
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The default target for FRI is Corstone-310. Update the
`docs/prerequisites.md` instructions to download Corstone-310 FVP.

Signed-off-by: Devaraj Ranganna <[email protected]>
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urutva committed Feb 27, 2024
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This reference integration supports [Arm ecosystem FVPs](https://developer.arm.com/downloads/-/arm-ecosystem-fvps).

The Corstone-300 ecosystem FVP is aligned with the Arm MPS3 development
platform. It is based on the Cortex-M55 processor and offers a choice of the
Ethos-U55 and Ethos-U65 processors. This FVP is provided free of charge for the
limited development and validation of open-source software on the Corstone-300
platform while Arm Virtual Hardware is recommended for commercial software.
Follow the [link](https://developer.arm.com/downloads/-/arm-ecosystem-fvps) for
more information.
The Corstone-310 model is a reference subsystem for a secure SSE-310 SoC
aligned with the Arm MPS3 development platform. It is based on a Cortex®-M85
processor and an Ethos-U55 neural network processor and the DMA-350
Direct Memory Access controller. Follow the [link](https://developer.arm.com/downloads/-/arm-ecosystem-fvps)
for more information.

### Setting up Arm ecosystem FVPs

* Download the Corstone-300 FVP from [here](https://developer.arm.com/downloads/-/arm-ecosystem-fvps)
* Run the following commands to install the Corstone-300 FVP and add FVP path
* Download the Corstone-310 FVP from [here](https://developer.arm.com/downloads/-/arm-ecosystem-fvps)
* Run the following commands to install the Corstone-310 FVP and add FVP path
to `PATH` variable.
```bash
mkdir FVP_Corstone_SSE-300_11.22_20
tar -xzf <download location>/FVP_Corstone_SSE-300_11.22_20_Linux64.tgz -C FVP_Corstone_SSE-300_11.22_20
cd FVP_Corstone_SSE-300_11.22_20
./FVP_Corstone_SSE-300.sh
echo PATH=\"<FVP installation path>/FVP_Corstone_SSE-300/models/Linux64_GCC-9.3:\$PATH\" >> ~/.bashrc
mkdir FVP_Corstone_SSE-310_11.24_13
tar -xzf <download location>/FVP_Corstone_SSE-310_11.24_13_Linux64.tgz -C FVP_Corstone_SSE-310_11.24_13
cd FVP_Corstone_SSE-310_11.24_13
./FVP_Corstone_SSE-310.sh
echo PATH=\"<FVP installation path>/FVP_Corstone_SSE-310_11.24_13/models/Linux64_GCC-9.3:\$PATH\" >> ~/.bashrc
source ~/.bashrc
```

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