2 files changed, 37 insertions, 12 deletions

diff --git a/sys/dev/dc/if_dc.c b/sys/dev/dc/if_dc.c
index 4e284d39cc20..603270361b3c 100644
--- a/sys/dev/dc/if_dc.c
+++ b/sys/dev/dc/if_dc.c
@@ -1705,20 +1705,37 @@ dc_decode_leaf_sia(struct dc_softc *sc, struct dc_eblock_sia *l)
 	struct dc_mediainfo *m;
 
 	m = malloc(sizeof(struct dc_mediainfo), M_DEVBUF, M_NOWAIT | M_ZERO);
-	if (l->dc_sia_code == DC_SIA_CODE_10BT)
+	switch (l->dc_sia_code & ~DC_SIA_CODE_EXT) {
+	case DC_SIA_CODE_10BT:
 		m->dc_media = IFM_10_T;
-
-	if (l->dc_sia_code == DC_SIA_CODE_10BT_FDX)
+		break;
+	case DC_SIA_CODE_10BT_FDX:
 		m->dc_media = IFM_10_T | IFM_FDX;
-
-	if (l->dc_sia_code == DC_SIA_CODE_10B2)
+		break;
+	case DC_SIA_CODE_10B2:
 		m->dc_media = IFM_10_2;
-
-	if (l->dc_sia_code == DC_SIA_CODE_10B5)
+		break;
+	case DC_SIA_CODE_10B5:
 		m->dc_media = IFM_10_5;
+		break;
+	default:
+		break;
+	}
 
-	m->dc_gp_len = 2;
-	m->dc_gp_ptr = (u_int8_t *)&l->dc_sia_gpio_ctl;
+	/*
+	 * We need to ignore CSR13, CSR14, CSR15 for SIA mode.
+	 * Things apparently already work for cards that do
+	 * supply Media Specific Data.
+	 */
+	if (l->dc_sia_code & DC_SIA_CODE_EXT) {
+		m->dc_gp_len = 2;
+		m->dc_gp_ptr =
+		(u_int8_t *)&l->dc_un.dc_sia_ext.dc_sia_gpio_ctl;
+	} else {
+		m->dc_gp_len = 2;
+		m->dc_gp_ptr =
+		(u_int8_t *)&l->dc_un.dc_sia_noext.dc_sia_gpio_ctl;
+	}
 
 	m->dc_next = sc->dc_mi;
 	sc->dc_mi = m;
diff --git a/sys/dev/dc/if_dcreg.h b/sys/dev/dc/if_dcreg.h
index 204b1d156d43..14912b5bb457 100644
--- a/sys/dev/dc/if_dcreg.h
+++ b/sys/dev/dc/if_dcreg.h
@@ -1171,9 +1171,17 @@ struct dc_eblock_hdr {
 struct dc_eblock_sia {
 	struct dc_eblock_hdr	dc_sia_hdr;
 	u_int8_t		dc_sia_code;
-	u_int8_t		dc_sia_mediaspec[6]; /* CSR13, CSR14, CSR15 */
-	u_int8_t		dc_sia_gpio_ctl[2];
-	u_int8_t		dc_sia_gpio_dat[2];
+	union {
+		struct dc_sia_ext { /* if (dc_sia_code & DC_SIA_CODE_EXT) */
+			u_int8_t dc_sia_mediaspec[6]; /* CSR13, CSR14, CSR15 */
+			u_int8_t dc_sia_gpio_ctl[2];
+			u_int8_t dc_sia_gpio_dat[2];
+		} dc_sia_ext;
+		struct dc_sia_noext { 
+			u_int8_t dc_sia_gpio_ctl[2];
+			u_int8_t dc_sia_gpio_dat[2];
+		} dc_sia_noext;
+	} dc_un;
 };
 
 #define DC_SIA_CODE_10BT	0x00