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rtl8169: fix receive for nuc BOXNUC7CJYH

--- a/sys/src/9/pc/ether8169.c

+++ b/sys/src/9/pc/ether8169.c

@@ -725,7 +725,14 @@

 	csr32w(ctlr, Tcr, Ifg1|Ifg0|Mtxdmaunlimited);

 	ctlr->tcr = csr32r(ctlr, Tcr);

-	ctlr->rcr = Rxfthnone|Mrxdmaunlimited|Ab|Am|Apm;

+	switch(ctlr->macv){

+	case Macv45:

+		ctlr->rcr = Rxfth256|Mrxdmaunlimited|Ab|Am|Apm;

+		break;

+	default:

+		ctlr->rcr = Rxfthnone|Mrxdmaunlimited|Ab|Am|Apm;

+		break;

+	}

 	ctlr->mchash = 0;

 	csr32w(ctlr, Mar0,   0);

 	csr32w(ctlr, Mar0+4, 0);