Messages in this thread | | | From | Paul Mackerras <> | Subject | Re: PATCH: serial patch for PPC | Date | Wed, 29 Sep 1999 16:11:04 +1000 |
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On Wed, 29 Sep 1999, tytso@mit.edu wrote:
> That shouldn't be causing a problem, though, as long as PPC systems are > either/or as far as Z8530 or 16550 UARTs are concerned.
They are, mostly, but not entirely. This becomes an issue if you have an apple laptop with a pcmcia modem card that looks like a 16550 (as I do) or if you want to build a kernel which will work both on machines with 8530s and on machines with 16550s. And there are in fact a few machines with both 8530s and 16550s. I have one, and at the moment I just don't use the 8530s.
> The tty_register_driver code currently doesn't mind if there is overlap > in the minor number space, actually. The most recently loaded driver > wins. The only time when register_tty_driver() will fail is if the > major number has already been grabbed by a non-tty driver. That's why I
I don't know what non-tty driver would be grabbing that major.
Paul.
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