UNDI_GET_INFORMATION calls into drivers/net/undi.c.  undi_probe() now
gets given a pxe_device representing a PXE stack that has been loaded
into memory but not initialised in any way.

Handle failures in undi_open() properly.

and matching them up to (e.g. PCI) devices.

functionality is now in pxebus.c.  (Not all bus functionality is ported
across yet.)

lying about in memory, not for loading from ROM), and UNDI net driver.

having to edit PXELOADER_KEEP_ALL as a config option.

function name to appear within the objects even in non-asserting
builds.  (This could be considered a gcc bug.)

Removing __FUNCTION__ from assert() reduces the size of bin/blib.a by
around 2.5%!

call.

Call netdevice's poll() and transmit() methods only when device is open.

but there's so much else missing that it's not worth doing right now.

net_device is unregistered.

reference holders that their reference is about to become invalid.

out-of-range ACK.

Simplify checksum generation on the TX datapath.

Move routing into a separate function

produces slightly smaller code.

Truncate TX length to TCP window at time of transmission rather than at
time of adding to TX packet; this is conceptually cleaner and also allows
the application to call tcp_send() multiple times to build up a single
packet.

"flags that are currently being sent".  This allows at least one special
case (checking that we haven't already sent a FIN in tcp_rx_fin()) to be
collapsed.

reopen connection.  (The TCP API will soon change to render this step
unnecessary.)

TargetAddress from the login response, because we still need the old
address while we close the connection!