From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric BENARD / Free <ebenard@free.fr>
Date: Sun, 13 Mar 2005 16:54:54 +0100
Subject: [U-Boot-Users] Re: Bug in AT91RM9200: icache not enabled!
In-Reply-To: <42345FB4.9070806@imc-berlin.de>
References: <42345CB8.2020807@free.fr> <42345FB4.9070806@imc-berlin.de>
Message-ID: <4234624E.8040406@free.fr>
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Steven Scholz a ?crit :
> thanks for your reply. Please include mailing list next time.
> 
sorry, I'm reading through gmane and I'm not subscribed to the list.
> 
> So you realy have both data and instruction cache enable in U-Boot?
> 
yes, at least I think so as kernel uncompressing is really faster when
using this setting.

Just add CFG_CMD_CACHE to #define CONFIG_COMMANDS in your
include/configs/x.h file
and you will be able to get cache informations :
=> icache
Instruction Cache is ON
=> dcache
Data (writethrough) Cache is ON

The strange thing is that :
- it's possible to turn icache off but not to enable it again
- it's not possible to turn dcache off.

=> icache off
Instruction Cache is OFF
=> icache on
Instruction Cache is OFF
=> dcache off
Data (writethrough) Cache is ON
=> dcache on
Data (writethrough) Cache is ON

I'm trying to understand why.

Eric