49 messages in org.freebsd.freebsd-hardwareRe: isa bus and boca multiport boards| From | Sent On | Attachments |
|---|---|---|
| Brett Glass | May 20, 1997 10:19 am | |
| Brett Glass | May 20, 1997 11:51 am | |
| Dan Welch | May 20, 1997 1:30 pm | |
| Randy Berndt | May 20, 1997 2:14 pm | |
| Brett Glass | May 20, 1997 5:11 pm | |
| Dan Welch | May 20, 1997 7:00 pm | |
| John-Mark Gurney | May 20, 1997 7:43 pm | |
| Dan Welch | May 20, 1997 7:57 pm | |
| Dan Welch | May 20, 1997 8:12 pm | |
| Gary T. Corcoran | May 20, 1997 8:50 pm | |
| Michael Smith | May 20, 1997 9:04 pm | |
| Michael Smith | May 20, 1997 9:33 pm | |
| Bruce Evans | May 20, 1997 10:15 pm | |
| Gary T. Corcoran | May 20, 1997 11:38 pm | |
| Bruce Evans | May 21, 1997 12:05 am | |
| John-Mark Gurney | May 21, 1997 12:17 am | |
| Poul-Henning Kamp | May 21, 1997 12:21 am | |
| John-Mark Gurney | May 21, 1997 12:43 am | |
| Bruce Evans | May 21, 1997 1:09 am | |
| Bruce Evans | May 21, 1997 1:16 am | |
| Bruce Evans | May 21, 1997 2:48 am | |
| Dan Welch | May 21, 1997 2:54 am | |
| Stefan Esser | May 21, 1997 3:16 am | |
| Poul-Henning Kamp | May 21, 1997 3:25 am | |
| Andrew Stesin | May 21, 1997 4:10 am | |
| Bruce Evans | May 21, 1997 5:36 am | |
| Dan Welch | May 21, 1997 6:02 am | |
| Stefan Esser | May 21, 1997 6:25 am | |
| Brett Glass | May 21, 1997 6:39 am | |
| Bruce Evans | May 21, 1997 6:44 am | |
| Brett Glass | May 21, 1997 6:59 am | |
| Brett Glass | May 21, 1997 7:04 am | |
| Brett Glass | May 21, 1997 7:09 am | |
| Poul-Henning Kamp | May 21, 1997 7:27 am | |
| Stefan Esser | May 21, 1997 9:26 am | |
| Poul-Henning Kamp | May 21, 1997 9:31 am | |
| Poul-Henning Kamp | May 21, 1997 9:33 am | |
| Rob Schofield | May 21, 1997 4:47 pm | |
| Michael Smith | May 21, 1997 9:15 pm | |
| Michael Smith | May 21, 1997 9:20 pm | |
| Brett Glass | May 21, 1997 10:10 pm | |
| Brett Glass | May 21, 1997 10:19 pm | |
| Gary Palmer | May 21, 1997 11:11 pm | |
| John-Mark Gurney | May 21, 1997 11:32 pm | |
| Michael Smith | May 21, 1997 11:37 pm | |
| Michael Smith | May 21, 1997 11:38 pm | |
| Poul-Henning Kamp | May 22, 1997 12:10 am | |
| Brett Glass | May 22, 1997 5:11 pm | |
| Wm Brian McCane | May 24, 1997 5:15 pm |
| Subject: | Re: isa bus and boca multiport boards | |
|---|---|---|
| From: | John-Mark Gurney (jm...@hydrogen.nike.efn.org) | |
| Date: | May 21, 1997 12:17:28 am | |
| List: | org.freebsd.freebsd-hardware | |
Bruce Evans scribbled this message on May 21:
Since the entire set of ports must be scanned whenever an interrupt occurs, maybe there is too much delay in getting to the upper ports. Something gets locked up if they overflow. I left several messages, but no one could figure it out.
Probably not. Scanning all (inactive) ports takes about 1/4 as long as handing one fully active 16550 port. Scanning 16 fully active ports at 115200 bops takes too long for the default (unconfigurable :-() fifo trigger level. However, having 16 fully active ports is rare.
so should I commit my changes that allow the sio to set 16550's to a trigger level of 8? and possibly make it more generic than it already is and allow people to define the resulting fifo level of the uart?
Nope. There are only some minor C inefficiencies in the important parts of the driver. The code is within 50% of best possible generic i386 assembler code by static instruction counts, but this is unimportant
hmm... now just to get a compiler like Watcomm that has optimization that works and isn't broken... a friend has this and he literally looked at code outputed by it, and couldin't inprove the asm output at ALL... of course you'd need to convince them to add support for FreeBSD's a.out format as right now it's a DOS/Win/OS2 based compiler... :(
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