From: "Stephen B. Johnson" <stevebj@inxpress•net>
To: "Brian Ford" <ford@vss•fsi.com>, "Gessner, Matt" <mattg@aiinet•com>
Cc: <linuxppc-embedded@lists•linuxppc.org>
Subject: Re: 66 Mhz bus clock for EST8260?
Date: Mon, 11 Dec 2000 10:47:58 -0600 [thread overview]
Message-ID: <000801c06392$1ea9e680$490a10d0@stevebj> (raw)
In-Reply-To: Pine.GSO.4.21.0012110927360.24199-100000@eos
The Artesyn PM/3GT1 & PM/3GE1 have a 200MHz MPC8260 that works great...
----- Original Message -----
From: "Brian Ford" <ford@vss•fsi.com>
To: "Gessner, Matt" <mattg@aiinet•com>
Cc: <linuxppc-embedded@lists•linuxppc.org>
Sent: Monday, December 11, 2000 9:32 AM
Subject: RE: 66 Mhz bus clock for EST8260?
>
> How many people have actually done this on an EST board? I don't doubt
> that the chip can do it, but I have my doubts about the EST PLL
> (clock) filter circuits being correct to begin with, let alone conforming
> to the errata.
>
> On Mon, 11 Dec 2000, Gessner, Matt wrote:
>
> > I had no problem at all getting this to work at 66MHz.
> > DO NOT RUN THE CPM FASTER THAN 133MHZ (at least on the chips I had,
> > it NEVER worked).
> >
> Yes. I'd gladly settle for 200/133/66.
>
> > In fact, I clocked my 166/133/66 chip at 300MHz :-)
> > That baby RUNS! Heh.
> >
> > > -----Original Message-----
> > > From: Brian Ford [mailto:ford@vss•fsi.com]
> > > Sent: Friday, December 08, 2000 1:47 PM
> > >
> > > Is there any magic in getting the EST8260 board to work with
> > > a 66 Mhz bus clock? I haven't had good luck with a Linux or vxWorks
> > > image.
> > >
> > > My board has a 200/166/66 rev A.1 chip.
> > >
> > > I boot using a vxWorks bootrom. I have made a few corrections to the
> > > bootrom so the decrementer frequency is set correctly from the user
> > > dip switches in addition to setting the core, cpm, and bus speeds.
> > >
> > > The scenerio is as follows:
> > >
> > > 1.) Burn configuration word to change MODCK_H from 0x0001 to 0x0101
> > > 2.) Swap oscillators 33.0 -> 66.0 Mhz
> > > 3.) Set MODCK[1-3] switches to 0x111 (200/133/66)
> > > 4.) Mirror 3.) on user switches for vxWorks bootrom to read
> > > 5.) Hack head_8260.S to put immr in place for Linux
> > > 6.) Set linux board info in embed_config.c to 200/133/66/66
> > > (core,cpm,bus,brg) making sure there is real space allocated for it
> > > instead or whatever was in r3 when vxWorks booted us.
> > > 6.) Reboot.
> > >
> > > vxWorks bootrom runs fine and downloads Linux or vxWorks.
> > >
> > > Linux pannics just before giving me a shell prompt somewhere
> > > in tty init.
> > >
> > > vxWorks appears to come up fine, but the muxDevBind fails for the Fast
> > > Ethernet and thus no network communications. Even though the bootrom
> > > just downloaded us successfully over the same interface.
> > >
> > > Has anyone had any luck with the 66 Mhz bus clock?
> > >
>
> --
> Brian Ford
> Software Engineer
> Vital Visual Simulation Systems
> FlightSafety International
> Phone: 314-551-8460
> Fax: 314-551-8444
>
>
>
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2000-12-11 16:47 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <7283DE19D141D111AD0E00A0C95B195502581E41@mail2.aiinet.com>
2000-12-11 15:32 ` 66 Mhz bus clock for EST8260? Brian Ford
2000-12-11 16:47 ` Stephen B. Johnson [this message]
2000-12-08 18:47 Brian Ford
2000-12-08 19:03 ` Dan Malek
2000-12-08 21:55 ` Jerry Van Baren
2000-12-08 20:09 ` Jerry Van Baren
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='000801c06392$1ea9e680$490a10d0@stevebj' \
--to=stevebj@inxpress$(echo .)net \
--cc=ford@vss$(echo .)fsi.com \
--cc=linuxppc-embedded@lists$(echo .)linuxppc.org \
--cc=mattg@aiinet$(echo .)com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox