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riscvarchive / riscv-linux

RISC-V Linux Port
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SMP kernel hangs at init under spike #28

Closed jleidel closed 8 years ago

jleidel commented 9 years ago

I built an SMP kernel (default w/ 8 cpu support) from the riscv-linux master as per the instructions on the riscv website (886e5f99498baa2c4d1c1e3e1db801e6f4ae68c1). I built the kernel using the riscv-tools master with the default configs. I've tested with two different image files. One built from scratch using busybox w/ a barebones config. The other was built from my previous yocto build. Both fail hang at the same point. I've verified that both boot fine with the default 1 cpu.

When ctrl-c'ing spike, it appears that cpu 0 and 1 are in infinite loops busy waiting for something. The busywait appears to be somewhere near PC 0xffffffff8005bfa0.

jleidel commented 9 years ago

quick update on this issue. It appears the issue arises when building the SMP kernel support for 2 cpus and running spike with 2 cpus.

terpstra commented 8 years ago

This should have been resolved by 030e8173dd9379de5c2f065ba73e734ff7647ef8.