Hi Bin, On Tue, 2018-11-13 at 00:22 -0800, Bin Meng wrote: > Allow U-Boot to run on hart 0 only, and suspend other harts. > > With this change, '-smp n' works on QEMU RISC-V board. > > Signed-off-by: Bin Meng <bmeng...@gmail.com> > > --- > > arch/riscv/cpu/start.S | 4 ++++ > 1 file changed, 4 insertions(+) >
Reviewed-by: Lukas Auer <lukas.a...@aisec.fraunhofer.de> I'll try to send my patch series with multi-hart support soon, so I hope we won't need this patch for long :) > diff --git a/arch/riscv/cpu/start.S b/arch/riscv/cpu/start.S > index 9858058..fcb0466 100644 > --- a/arch/riscv/cpu/start.S > +++ b/arch/riscv/cpu/start.S > @@ -46,6 +46,10 @@ _start: > /* mask all interrupts */ > csrw mie, zero > > + csrr t0, mhartid > + beqz t0, call_board_init_f > +1: j 1b > + To suspend the other harts, you can also add a WFI instruction before the jump instruction. Thanks, Lukas > /* > * Set stackpointer in internal/ex RAM to call board_init_f > */ _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
