nvkm_rd08
return nvkm_rd08(device, 0x601000 + port);
return nvkm_rd08(device, 0x601000 + (head * 0x2000) + port);
return nvkm_rd08(device, 0x0c0000 + (head * 0x2000) + port);
sr1[i] = nvkm_rd08(device, 0x0c03c5 + (i * 0x2000));