XNS support for secondary boards -- reprogramming phys addr.

add simple-minded XNS support

now compiles under 4.3

now compiles under 4.3

typo

ifconfig down resets interface, ifconfig up reinitializes;
error when trying to output packets on down interface; fix address set
routine, and save the new address for arp; still not working with uba

ifconfig down resets interface, ifconfig up reinitializes;
error when trying to output packets on down interface; fix address set
routine, and save the new address for arp; still not working with uba reset

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ifconfig down resets interface, ifconfig up reinitializes;
return error when attempting to send to down interface

ifconfig down resets interface, ifconfig up reinitializes;
return error when attempting to send to down interface

ifconfig down resets interface, ifconfig up reinitializes;
return error when attempting to send to down interface

ifconfig down resets interface, ifconfig up reinitializes;
return error when attempting to send to down interface

make receive buffers large enough for trailing bits,
avoiding segmenting max-size message and possibly losing end-of-message

allow receive from transmit buffer (for deuna)

allow receive from transmit buffer (for deuna)

add "#if N?? > 0"

add "#if N?? > 0"

add "#if N?? > 0"

add "#if N?? > 0"

add "#if N?? > 0"

add "#if N?? > 0"

add "#if N?? > 0"

minor nit

missing vvprt_hdr

from ACC

convert to 4.3

convert to 4.3