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- Newsgroups: comp.os.linux
- Path: sparky!uunet!gatech!bloom-beacon!bloom-picayune.mit.edu!root
- From: tytso@ATHENA.MIT.EDU (Theodore Ts'o)
- Subject: Re: 16550A
- Message-ID: <1992Aug25.215550.26919@athena.mit.edu>
- Sender: root@athena.mit.edu (System PRIVILEGED Account)
- Reply-To: tytso@ATHENA.MIT.EDU (Theodore Ts'o)
- Organization: The Internet
- Date: Tue, 25 Aug 1992 21:55:50 GMT
- Lines: 25
-
- From: satishc@microsoft.com (Satish Chittamuru)
- Date: 25 Aug 92 02:11:42 GMT
-
- > Does anyone else have problems with Linux not correctly "shutting down"
- > the 16550? Ever since the kernel has supported a 16550, I have had to
- > hard reset the computer after running linux, or it seems that the
- > computer "forgets" that the port that contains the 16550, exists.
-
- I have always had this problem. I usually just hard reboot if I need
- to use the modem again. Would be nice if this could be fixed.
-
- If you do a soft reboot back into Linux, does it also lose the 16550?
- Or is it only DOS/OS2 which can't find the 16550 after you boot Linux?
- If it's the problem I think it is, it would seem to me to be awfully
- non-robust of DOS not to be able to deal with a 16550A that has had FIFO
- enabled. You'd either MS-DOS or the BIOS would send the FIFO disable
- sequence to a UART before trying to use it.
-
- Once I have time to recover from moving to a new apartment, I'll make
- changes to the version of the serial driver I've been working on to
- shutdown the 16550A FIFO's upon device close, instead of leaving the
- FIFO's enabled the whole time. I think this should fix the problem.
-
- - Ted
-
-