From: Kalle Pokki <kalle.pokki@iki.fi>
To: Dan Malek <dan@embeddedalley.com>
Cc: linuxppc-embedded@ozlabs.org
Subject: Re: CPM2 early console
Date: Tue, 27 Sep 2005 22:35:13 +0200 [thread overview]
Message-ID: <4339AD01.30708@iki.fi> (raw)
In-Reply-To: <384d09b865d454875c447cc02c89d001@embeddedalley.com>
Dan Malek wrote:
>
> On Sep 27, 2005, at 10:11 AM, Kalle Pokki wrote:
>
>> Any ideas what can set the bootmem memory as cached?
>
> All of memory is always cached on 82xx. Which is fine
> since the cache controller keeps the processor core
> and peripherals coherent in hardware.
OK. Then the question really is why isn't the cache controller enforcing
coherency between the G2_LE core and the CPM. While trying to debug the
console driver I wrote a really simple SCC driver separated from the
rest of the kernel in order to have a usable debug printf. And I
couldn't get any buffers printed through the SCC until I started to use
buffers in DPRAM. The CPM just didn't see anything I wrote to the
buffers. The same thing seems to bother at least the console driver and
the FCC ethernet driver (though they don't work at all for me at the
moment..)
I think it is obvious I have misconfigured something, but at this point
I am not even sure if it is something I should have initialised in the
boot loader.
next prev parent reply other threads:[~2005-09-27 20:35 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-22 16:02 CPM2 early console Rune Torgersen
2005-09-22 16:05 ` Kumar Gala
2005-09-23 10:55 ` Kalle Pokki
2005-09-27 14:11 ` Kalle Pokki
2005-09-27 16:39 ` Dan Malek
2005-09-27 20:35 ` Kalle Pokki [this message]
2005-09-27 20:48 ` Dan Malek
2005-09-28 10:20 ` Kalle Pokki
2005-09-29 12:24 ` Kalle Pokki
2005-09-29 12:50 ` Dan Malek
2005-09-30 13:22 ` Alex Zeffertt
2005-09-30 13:42 ` Alex Zeffertt
2005-09-30 20:16 ` Kalle Pokki
2005-09-30 13:58 ` Dan Malek
2005-09-30 20:10 ` Kalle Pokki
2005-09-30 20:28 ` Dan Malek
2005-10-01 5:57 ` Kalle Pokki
2005-10-01 8:24 ` Roger Larsson
2005-10-02 16:59 ` Dan Malek
2005-10-03 7:04 ` Kalle Pokki
2005-10-04 8:13 ` Kalle Pokki
2005-10-04 9:59 ` Alex Zeffertt
2005-10-04 10:16 ` Kalle Pokki
2005-10-04 16:04 ` Dan Malek
-- strict thread matches above, loose matches on Subject: below --
2005-09-22 13:11 Kalle Pokki
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