From: Jason Eckhardt <jason@equator.com>
To: kumar@ix.netcom.com, parisc-linux@thepuffingroup.com
Subject: Re: [parisc-linux] Qn on Linux/PA-RISC future Console driver
Date: Wed, 7 Apr 1999 11:05:39 -0700 (PDT) [thread overview]
Message-ID: <199904071805.LAA22267@gatekeeper.equator.com> (raw)
>
> Hi,
> Has anyone done some work on Linux/PA-RISC Console driver.
> Are we planning to use PDC for console or is it possible
> to directly access Console device.
>
I believe HP-UX uses the STI ROM interface rather than going
through the IODC interface (i.e. like the bootstrap), although an HP person
can tell us positively.
It doesn't seem we could get very good performance through IODC console calls
due to the setup involved when calling it from an virtually addressed OS
(switching to real mode, etc). Also, I believe that IODC is not re-entrant.
I don't know if the STI ROM has the same restrictions.
It would be nice to have direct access to the console device (although it
is more work), but as of
yet we have no console device-specific documentation (or even the STI ROM
i/f for that matter).
Jason.
next reply other threads:[~1999-04-07 18:07 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-04-07 18:05 Jason Eckhardt [this message]
1999-04-07 19:47 ` [parisc-linux] Qn on Linux/PA-RISC future Console driver Grant Grundler
1999-04-07 20:18 ` Don Dyer
1999-04-07 21:43 ` Bill Katz
-- strict thread matches above, loose matches on Subject: below --
1999-04-07 3:06 Kumar
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