From: Kalle Pokki <kalle.pokki@iki.fi>
To: Dan Malek <dan@embeddedalley.com>
Cc: linuxppc-embedded@ozlabs.org
Subject: Re: CPM2 early console
Date: Wed, 28 Sep 2005 12:20:29 +0200 [thread overview]
Message-ID: <433A6E6D.4070403@iki.fi> (raw)
In-Reply-To: <714c16295fbfa97caafd1d0aa3a5932e@embeddedalley.com>
Dan Malek wrote:
> On Sep 27, 2005, at 4:35 PM, Kalle Pokki wrote:
>
>> OK. Then the question really is why isn't the cache controller
>> enforcing coherency between the G2_LE core and the CPM.
>
> Is the GBL and DTB set properly in the function code registers
> of the SCC parameter ram?
The 60x bus is used, but snooping wasn't enabled before.
However, even after enabling snooping it still doesn't work right. If
I'm just within my boot loader I still cannot use e.g. the SMC with WIMG
bits 0010 and the GBL 1. If I set the write-through in WIMG bits as
1010, it works. The core now sees the RX buffers from the CPM and, of
course, my TX buffers since they are written to the memory.
I guess Linux remaps the RAM as copy-back. But snooping should work with
copy-back caches, shouldn't it?
next prev parent reply other threads:[~2005-09-28 10:20 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
2005-09-27 20:48 ` Dan Malek
2005-09-28 10:20 ` Kalle Pokki [this message]
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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