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- From: fl0p+@andrew.cmu.edu (Frank T Lofaro)
- Newsgroups: comp.os.linux
- Subject: Re: 16550A
- Message-ID: <IeZxlja00VpcQ8rV8U@andrew.cmu.edu>
- Date: 23 Aug 92 10:43:59 GMT
- References: <66623@hydra.gatech.EDU>
- Organization: Freshman, Physics, Carnegie Mellon, Pittsburgh, PA
- Lines: 31
- In-Reply-To: <66623@hydra.gatech.EDU>
-
- From netnews.comp.os.linux: 23-Aug-92 16550A gt0449a@prism.gatech.EDU
- (Rob Coleman) (1124)
-
- >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. When I
- >soft reboot from linux (after doing a shutdown), the CMOS screen shows
- >one less serial port (in my case, None), and programs such as OS/2
- >refuse to install the COM drivers because they don't see the serial
- >port. (I have no term program running under Linux at the time)
-
- >I had this problem with beta versions OS/2 early on where it would
- >exhibit the same behavior (and still will if I reboot OS/2 while
- >running a term program), but a normal shutdown (in the final release of
- >OS/2) "correctly closes" the port (ie. the computer is aware of the
- >ports existence when the CMOS screen comes up).
-
- >Is there code that needs to be added to Shutdown that would relinquish
- >control of the port?
-
- Actually something like that should probably be in the kernel reboot
- code that is run when the reboot system call is executed. There are a
- few problems with rebooting remaining, it seems. Some of them might be
- due to the computer BIOS, and some due to Linux. Hopefully a patch to
- the Linux reboot code will fix any Linux bugs or work around any BIOS
- bugs.
-
- By the way, I have had no trouble with reboot usually. My computer had a
- CMOS amnesia attack (forgot the *WHOLE* setup), but I don't know if
- Linux did that. It happened only once.
-