[U-Boot-Users] RE: Virtex-II Pro and Instruction Prefetching
John.Kerl at Avnet.com
Mon Jun 16 17:52:52 CEST 2003
1. Wolfgang is correct -- you should fix the SDRAM.
2. Also, though: the ICCR and DCCR apply when the MMU
is off. Memory parameters for when the MMU is enabled
is done via the W/I/M/G bits in the TLB entries.
From: Wolfgang Denk [mailto:wd at denx.de]
Sent: Saturday, June 14, 2003 6:46 AM
To: Frank Smith
Cc: u-boot-users at lists.sourceforge.net;
linuxppc-embedded at lists.linuxppc.org
Subject: Re: Virtex-II Pro and Instruction Prefetching
In message <03Jun14.092013adt.7305 at dragon.appliedmicro.ns.ca> you wrote:
> I'm working on getting PPCBoot 2.0.0 and Linux running on a custom
> Virtex-II Pro development board.
May I ask why you use PPCBoot (a dead project) instead of the
successor project U-Boot?
> I'm currently encountering problems with my DDR SDRAM controller --
This is a very common problem. Seems 99% of all people who attempt to
port U-Boot see this soner or later.
> it can't seem to handle instruction prefetching yet. So to sidestep the
> issue for now, I want to configure the 405 so that instructions
> are not prefetched.
Don't. The problem will bit you later again. Solve problems as they
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd at denx.de
Violence in reality is quite different from theory.
-- Spock, "The Cloud Minders", stardate 5818.4
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