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b68876d75d
Add documentation for qemu-armv7r board which emulates ARM Cortex-R5 processor using OpenVela's QEMU fork. The upstream QEMU does not support ARM Cortex-R virt machine, so this board requires the prebuilt QEMU from OpenVela. This documentation covers: - NSH (flat build) configuration - PNSH (protected build with MPU) configuration - Prerequisites for downloading prebuilt QEMU - Debugging instructions with GDB Signed-off-by: buxiasen <buxiasen@xiaomi.com>