output buffering defintions and the like)

connections might break things. Only-sending applications like syslog()
do not need a newdata() handler, so added a check if that handler exists.

ISA 3c509 is currently non-functional, although the EISA (3c509-eisa) and
MCA (3c529) variants should build OK.

None of this code is yet tested.

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value.

to avoid drops even on slow NICs.

is now gPXE-specific.  (The standard malloc() et al have been in stdlib.h
for a while).

Add free memory counter.

needed now that performance is up.

this saves around 70us per received packet (which is around 50% of the
overall packet processing time).

almost everywhere else.

other protocol won't work at the moment.

Tidy up code

it as a fallback network device rather than an explicitly forced network
device.

Clear routing table entries before re-attempting DHCP.

exception rather than the rule; we may as well keep things clean for other
protocols.

will enable us to cascade async operations, which is necessary in order to
properly support DNS.  (For example, an HTTP request may have to redirect
to a new location and will have to perform a new DNS lookup, so we can't
just rely on doing the name lookup at the time of parsing the initial
URL).

Anything other than HTTP is probably broken right now; I'll fix the others
up asap.

tcpip_tx().  This avoids the irritating wait when you accidentally type
"kernel pxelinux.0" before bringing up the network interface.

Add ENETUNREACH to strerror()'s list.

retrying".

order so we can just use buffer->fill.

Add debug autocolourisation to TFTP.