arch/riscv/kernel/vdso/flush_icache.S:25: Error: unrecognized opcode `fence.i', extension `zifencei' required arch/riscv/include/asm/irqflags.h:36: Error: unrecognized opcode `csrc sstatus,2', extension `zicsr' required arch/riscv/include/asm/irqflags.h:24: Error: unrecognized opcode `csrr a5,sstatus', extension `zicsr' required arch/riscv/include/asm/irqflags.h:36: Error: unrecognized opcode `csrc sstatus,2', extension `zicsr' required arch/riscv/include/asm/irqflags.h:24: Error: unrecognized opcode `csrr a5,sstatus', extension `zicsr' required arch/riscv/include/asm/irqflags.h:30: Error: unrecognized opcode `csrs sstatus,2', extension `zicsr' required arch/riscv/include/asm/irqflags.h:24: Error: unrecognized opcode `csrr a5,sstatus', extension `zicsr' required arch/riscv/include/asm/irqflags.h:30: Error: unrecognized opcode `csrs sstatus,2', extension `zicsr' required