Merge SIByte SB1250 net driver from 2.4.x.

drivers/net/Config.in

@@ -57,6 +57,9 @@ if [ "$CONFIG_NET_ETHERNET" = "y" ]; then
    if [ "$CONFIG_MIPS_AU1000" = "y" ]; then
       bool '  MIPS AU1000 Ethernet support' CONFIG_MIPS_AU1000_ENET
    fi
+   if [ "$CONFIG_SIBYTE_SB1250" = "y" ]; then
+      tristate '  SB1250 Ethernet support' CONFIG_NET_SB1250_MAC
+   fi
    if [ "$CONFIG_SGI_IP27" = "y" ]; then
       bool '  SGI IOC3 Ethernet' CONFIG_SGI_IOC3_ETH
    fi

drivers/net/Makefile

@@ -134,6 +134,7 @@ obj-$(CONFIG_E2100) += e2100.o 8390.o
 obj-$(CONFIG_ES3210) += es3210.o 8390.o
 obj-$(CONFIG_LNE390) += lne390.o 8390.o
 obj-$(CONFIG_NE3210) += ne3210.o 8390.o
+obj-$(CONFIG_NET_SB1250_MAC) += sb1250-mac.o
 
 obj-$(CONFIG_PPP) += ppp_generic.o slhc.o
 obj-$(CONFIG_PPP_ASYNC) += ppp_async.o