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riscv: sifive_u: Update the plic hart config to support multicore
At present the PLIC is instantiated to support only one hart, while the machine allows at most 4 harts to be created. When more than 1 hart is configured, PLIC needs to instantiated to support multicore, otherwise an SMP OS does not work. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
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