home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.os.linux
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!linac!att!cbnewsm!cbnewsl!att-out!cbfsb!cbnewsg.cb.att.com!wto
- From: wto@cbnewsg.cb.att.com (William T. O Connell)
- Subject: Conflicting IRQs
- Message-ID: <1993Jan6.070636.5289@cbfsb.cb.att.com>
- Keywords: modem,mouse
- Sender: news@cbfsb.cb.att.com
- Organization: AT&T
- Date: Wed, 6 Jan 1993 07:06:36 GMT
- Lines: 42
-
- Mouse (com1) and modem (com3) conflict when used simultaneously (e.g under X).
- The mouse dies :-( (can't do anything but re-boot). This will under X
- either when I have a uugetty running on com3 or try to start seyon.
-
- There have been posts in the past that discuss how to handle situations
- like this when two devices are used simultaneously which have the same IRQ.
- e.g.)
- <wyvern@gnu.ai.mit.edu> posted about a month ago to
- change the line in the kernel (serial.c) from
-
- struct struct_ISR COM3_ISR = { 4, 0x3e8, UART_ISR_proc, 0 );
- to
- struct struct_ISR COM3_ISR = { 5, 0x3e8, UART_ISR_proc, 0 );
- ^
-
- Before modifying and re-building the kernel, I downloaded setserial.tar.Z
- from tsx-11, and decided to try it with the 'setserial' command.
-
- Prior to modifying the serial ports, they had the following settings:
- /dev/ttys0, Type: 16450, Line: 0, Port: 0x03f8, IRQ: 4 # Mouse
- /dev/ttys2, Type: 16450, Line: 2, Port: 0x03e8, IRQ: 4 # Modem
-
- Notice, same IRQ values.
-
- So I thought I would simply change the IRQ on the modem from 4 to 5. e.g)
- /dev/ttys0, Type: 16450, Line: 0, Port: 0x03f8, IRQ: 4 # Mouse
- /dev/ttys2, Type: 16450, Line: 2, Port: 0x03e8, IRQ: 5 # Modem
- ^
-
- What happens is when I go into X, and either try to start seyon -or-
- have uugetty running, the mouse won't move (stubborn little thing).
-
- Now, I tried many combinations of the above scenerio (i.e. chging the
- mouse's value instead, chging from 5 to some other IRQ value like 10, ...)
-
- I'm kinda stuck right now (especially since I thought the above
- scenerio would fix it), Could someone give me a helping hand up
- and give me some insight (or lack of it)?
-
- Thanks,
-
- - Bill wto@ihlpx.att.com
-