excamera, what I'm hacking on, daily.
jamesb@excamera.com
Wed, 16 Jul 2003
Ring buffer
OK, the dropped packet is not being received by the RTL8019.
The RTL8019 receive buffer has two pointers, a read pointer and a
write pointer. The RTL8019 writes packets at the CURR pointer, but
never writes packets past the BNRY pointer, which the packet driver is
meant to use as a read pointer. Some drivers set BNRY to the value of
the read pointer, some set it to (readptr-1).