riscv: Add QEMU virt board support
This adds QEMU RISC-V 'virt' board target support, with the hope of helping people easily test U-Boot on RISC-V. The QEMU virt machine models a generic RISC-V virtual machine with support for the VirtIO standard networking and block storage devices. It has CLINT, PLIC, 16550A UART devices in addition to VirtIO and it also uses device-tree to pass configuration information to guest software. It implements RISC-V privileged architecture spec v1.10. Both 32-bit and 64-bit builds are supported. Support is pretty much preliminary, only booting to U-Boot shell with the UART driver on a single core. Booting Linux is not supported yet. Signed-off-by: NBin Meng <bmeng.cn@gmail.com> Reviewed-by: NLukas Auer <lukas.auer@aisec.fraunhofer.de>
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arch/riscv/cpu/qemu/Makefile
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arch/riscv/cpu/qemu/cpu.c
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arch/riscv/cpu/qemu/dram.c
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configs/qemu-riscv32_defconfig
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configs/qemu-riscv64_defconfig
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doc/README.qemu-riscv
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include/configs/qemu-riscv.h
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