Date: Thu, 11 Jul 1996 09:45:22 +1000 From: Bruce Evans <bde@zeta.org.au> To: ejs@bfd.com, terry@lambert.org Cc: SimsS@infi.net, davidg@Root.COM, dawes@rf900.physics.usyd.edu.au, hackers@FreeBSD.org, jgreco@brasil.moneng.mei.com, jkh@time.cdrom.com Subject: Re: Some recent changes to GENERIC Message-ID: <199607102345.JAA00264@godzilla.zeta.org.au>
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>While I agree that a lot of people don't bother avoiding interrupt >conflict, I have to disagree with the software not allowing for it. I >honestly can't remember a single program from 5 years of consulting that >allowed for com 3 without letting me specify what IRQ com 3 was on. Even >Win3.1 (can't speak for older versions) can be set, just not easily. Even FreeBSD can be set, just not easily: 1. reboot 2. enter -c at the boot prompt 3. change the config to get interrupts on the ports that you want to use, e.g.: irq sio0 -1 # no irq, i.e., polled mode for sio0 irq sio1 -1 # no irq, i.e., polled mode for sio1 irq sio2 4 # if necessary irq sio3 3 # if necessary or: disable sio0 disable sio1 irq sio2 4 # if necessary enable sio2 irq sio3 3 # if necessary enable sio3 Polled mode is good enough up to 9600 bps if the UART is a 16550. It is just as good as completely disabling the port if the port isn't used. Bruce
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