The ste(4) driver supporting Ethernet cards based on the Sundance ST201 chipset (i.e., the D-Link 550TX) has a bug which causes the machine to panic at boot-time. Apply by doing: cd /usr/src patch -p0 < 015_ste.patch And then rebuild your kernel. Index: sys/dev/pci/if_ste.c =================================================================== RCS file: /cvs/src/sys/dev/pci/if_ste.c,v retrieving revision 1.6 retrieving revision 1.7 diff -u -r1.6 -r1.7 --- sys/dev/pci/if_ste.c 2000/02/15 02:28:15 1.6 +++ sys/dev/pci/if_ste.c 2000/06/27 20:09:42 1.7 @@ -1,4 +1,4 @@ -/* $OpenBSD: if_ste.c,v 1.6 2000/02/15 02:28:15 jason Exp $ */ +/* $OpenBSD: if_ste.c,v 1.7 2000/06/27 20:09:42 aaron Exp $ */ /* * Copyright (c) 1997, 1998, 1999 * Bill Paul . All rights reserved. @@ -1101,6 +1101,7 @@ cd = &sc->ste_cdata; ld = sc->ste_ldata; for (i = 0; i < STE_TX_LIST_CNT; i++) { + cd->ste_tx_chain[i].ste_ptr = &ld->ste_tx_list[i]; cd->ste_tx_chain[i].ste_phys = vtophys(&ld->ste_tx_list[i]); if (i == (STE_TX_LIST_CNT - 1)) cd->ste_tx_chain[i].ste_next =