CB_NODE_MAINBOARD
nodes[CB_NODE_MAINBOARD] = SYSCTL_ADD_NODE(&sc->sysctl_ctx,
{ CB_NODE_MAINBOARD, CB_NODE_ROOT, "mainboard",
{ CB_NODE_MAINBOARD, "vendor", CB_SYSCTL_STRING,
{ CB_NODE_MAINBOARD, "part", CB_SYSCTL_STRING,