On Fri, Jan 28, 2022 at 9:47 PM Alexandre Ghiti <alexandre.gh...@canonical.com> wrote: > > The following description is copied from the equivalent patch for the > Linux Kernel proposed by Aurelien Jarno: > > From version 2.38, binutils default to ISA spec version 20191213. This > means that the csr read/write (csrr*/csrw*) instructions and fence.i > instruction has separated from the `I` extension, become two standalone > extensions: Zicsr and Zifencei. As the kernel uses those instruction, > this causes the following build failure: > > arch/riscv/cpu/mtrap.S: Assembler messages: > arch/riscv/cpu/mtrap.S:65: Error: unrecognized opcode `csrr a0,scause' > arch/riscv/cpu/mtrap.S:66: Error: unrecognized opcode `csrr a1,sepc' > arch/riscv/cpu/mtrap.S:67: Error: unrecognized opcode `csrr a2,stval' > arch/riscv/cpu/mtrap.S:70: Error: unrecognized opcode `csrw sepc,a0' > > Signed-off-by: Alexandre Ghiti <alexandre.gh...@canonical.com> > --- > arch/riscv/Makefile | 11 ++++++++++- > 1 file changed, 10 insertions(+), 1 deletion(-) >
Reviewed-by: Bin Meng <bmeng...@gmail.com>
