RISCV64 co-simulation demo problem

[peng-isi]

Hi, all
I am trying to re-produce the riscv64 co-simulation demo, but the lamc2 systemC failed to connect with the VM. However, I can successfully boot up the guest kernel, but there is no kernel message to show lmac2 is up. Here are what I did:

1. I use buildroot to generate the rootfs.ext2
2. I build ventilator v3.926
3. I build systemc-2.3. 2 and systems-2.3.3 (tried both)
4. I build the RISCV SW stack with LMAC2
5. I add LMAC to virt dtb
   I can successfully boot the RISCV64 Linux up, but I cannot find any kernel message related with the lmac2 SystemC. Do I miss something here?

Any help is appreciated!