From: Benjamin Herrenschmidt <bh40@calva.net>
To: linuxppc-dev@lists.linuxppc.org, Zach Metzinger <wizkid@ksu.edu>
Subject: Re: Restructure of arch/ppc/kernel and include/asm-ppc
Date: Thu, 17 Dec 1998 14:57:00 +0100 [thread overview]
Message-ID: <19981217145700.030398@mail.mipsys.com> (raw)
In-Reply-To: <19981214104446.A3769@bleck.ksu.ksu.edu>
On Mon, Dec 14, 1998, Zach Metzinger <wizkid@ksu.edu> wrote:
>Anyone been hunting down the serial port problems with early g3s? Is the
>macrocell in apple's chip a true clone of the 8530 ESCC?
It should be more CHRP-like, so additional registers defined by CHRP may
be available. I'm wondering if there may be a problem like a wrong
default value in the register that indicates the number of cycles to wait
on each access. This would explain some of the problems.
Some people I know working on Geoport-based hardware had lots of troubles
with the G3 machines. It looks like quickly repeated access to the data
register will just cause corrupted datas to be transmitted. The problem
is especially visible when DMA is used. I plan to do experiments with
this but I didn't find the time yet.
--
E-Mail: <mailto:bh40@calva.net>
BenH. Web : <http://calvaweb.calvacom.fr/bh40/>
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next prev parent reply other threads:[~1998-12-17 13:57 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-12-12 16:36 Restructure of arch/ppc/kernel and include/asm-ppc Corey Minyard
1998-12-13 17:59 ` Geert Uytterhoeven
1998-12-14 9:54 ` Benjamin Herrenschmidt
1998-12-14 10:43 ` Geert Uytterhoeven
1998-12-17 0:49 ` Douglas Godfrey
1998-12-16 17:53 ` Joshua Rosenau
1998-12-14 16:44 ` Zach Metzinger
1998-12-17 13:57 ` Benjamin Herrenschmidt [this message]
1998-12-14 19:13 ` Peter De Schrijver
1998-12-16 4:50 ` Troy Benjegerdes
1998-12-18 10:25 ` Gabriel Paubert
1998-12-19 2:14 ` preploader, works on MTX, not on BlackHawk Troy Benjegerdes
1998-12-21 12:41 ` Gabriel Paubert
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