freebsd-nq/sys/i386
Bill Paul ab431312b4 This commit adds driver support for PCI fast ethernet cards based on the
ADMtek AL981 "Comet" chipset. The AL981 is yet another DEC tulip clone,
except with simpler receive filter options. The AL981 has a built-in
transceiver, power management support, wake on LAN and flow control.
This chip performs extremely well; it's on par with the ASIX chipset
in terms of speed, which is pretty good (it can do 11.5MB/sec with TCP
easily).

I would have committed this driver sooner, except I ran into one problem
with the AL981 that required a workaround. When the chip is transmitting
at full speed, it will sometimes wedge if you queue a series of packets
that wrap from the end of the transmit descriptor list back to the
beginning. I can't explain why this happens, and none of the other tulip
clones behave this way. The workaround this is to just watch for the end
of the transmit ring and make sure that al_start() breaks out of its
packet queuing loop and waiting until the current batch of transmissions
completes before wrapping back to the start of the ring. Fortunately, this
does not significantly impact transmit performance.

This is one of those things that takes weeks of analysis just to come
up with two or three lines of code changes.
1999-05-21 04:37:48 +00:00
..
apm Divorce "dev_t" from the "major|minor" bitmap, which is now called 1999-05-11 19:55:07 +00:00
bios Divorce "dev_t" from the "major|minor" bitmap, which is now called 1999-05-11 19:55:07 +00:00
boot Update #include statements to reflect the new location of "sioreg.h". 1999-04-22 21:02:44 +00:00
conf This commit adds driver support for PCI fast ethernet cards based on the 1999-05-21 04:37:48 +00:00
eisa Don't detect an EISA bus unless we see a "card" there somewhere. An EISA 1999-05-18 21:03:30 +00:00
i386 This commit adds driver support for PCI fast ethernet cards based on the 1999-05-21 04:37:48 +00:00
ibcs2 Fix a couple of warnings and some bitrot in comments. 1999-05-09 16:04:14 +00:00
include Set CHAR_{MIN,MAX} according to -funsigned-char flag given or not 1999-05-20 23:33:35 +00:00
isa Move pcibus (host -> pci bus) probe/attach routines from nexus 1999-05-18 20:48:43 +00:00
linux Divorce "dev_t" from the "major|minor" bitmap, which is now called 1999-05-11 19:55:07 +00:00
pci Move pcibus (host -> pci bus) probe/attach routines from nexus 1999-05-18 20:48:43 +00:00
svr4 Enable vmspace sharing on SMP. Major changes are, 1999-04-28 01:04:33 +00:00
Makefile Update to know about current kernel directory layout. 1999-02-28 22:14:16 +00:00