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ether83815: fix `auto neg timed out' error with sis 900 rev 635.
the openbsd sis(4) driver does not actually go through the rest
of softreset() with sis cards. also, rev 635 reads the mac address
differently, so copy-paste code from openbsd to handle that.

--- a/sys/src/9/pc/ether83815.c

+++ b/sys/src/9/pc/ether83815.c

@@ -92,6 +92,7 @@

 	SiSrev630s =	0x81,

 	SiSrev630e =	0x82,

 	SiSrev630ea1 =	0x83,

+	SiSrev635 =	0x90,

 	SiSeenodeaddr =	8,		/* short addr of SiS eeprom mac addr */

 	SiS630eenodeaddr =	9,	/* likewise for the 630 */

@@ -166,6 +167,7 @@

 enum {

 	/* registers (could memory map) */

 	Rcr=	0x00,		/* command register */

+	  Rld=		1<<10,	/* reload */

 	  Rst=		1<<8,

 	  Rxr=		1<<5,	/* receiver reset */

 	  Txr=		1<<4,	/* transmitter reset */

@@ -772,6 +774,8 @@

 	 * Soft-reset the controller

 	 */

 	resetctlr(ctlr);

+	if(ctlr->id != Nat83815)

+		return 0;

 	csr32w(ctlr, Rccsr, Pmests);

 	csr32w(ctlr, Rccsr, 0);

 	csr32w(ctlr, Rcfg, csr32r(ctlr, Rcfg) | Pint_acen);

@@ -923,7 +927,21 @@

 	int i, off = SiSeenodeaddr, cnt = sizeof ee.eaddr / sizeof(short);

 	ushort *shp = (ushort *)ee.eaddr;

-	if(!is630(ctlr->id, ctlr->pcidev) || !sisrdcmos(ctlr)) {

+	if(ctlr->id == SiS900 && ctlr->pcidev->rid == SiSrev635) {

+		csr32w(ctlr, Rcr, csr32r(ctlr, Rcr) | Rld);

+		csr32w(ctlr, Rcr, csr32r(ctlr, Rcr) & ~Rld);

+		csr32w(ctlr, Rrfcr, csr32r(ctlr, Rrfcr) & ~Rfen);

+

+		csr32w(ctlr, Rrfcr, 0);

+		*shp++ = csr32r(ctlr, Rrfdr);

+		csr32w(ctlr, Rrfcr, 1<<16);

+		*shp++ = csr32r(ctlr, Rrfdr);

+		csr32w(ctlr, Rrfcr, 1<<17);

+		*shp = csr32r(ctlr, Rrfdr);

+

+		csr32w(ctlr, Rrfcr, csr32r(ctlr, Rrfcr) | Rfen);

+		memmove(ctlr->sromea, ee.eaddr, sizeof ctlr->sromea);

+	} else if(!is630(ctlr->id, ctlr->pcidev) || !sisrdcmos(ctlr)) {

 		for (i = 0; i < cnt; i++)

 			*shp++ = eegetw(ctlr, off++);

 		memmove(ctlr->sromea, ee.eaddr, sizeof ctlr->sromea);

-- 

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