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Re: HIGHMEM Query

To: Rishabh@soc-soft.com
Subject: Re: HIGHMEM Query
From: Ralf Baechle <ralf@linux-mips.org>
Date: Thu, 17 Feb 2005 20:36:54 +0000
Cc: linux-mips@linux-mips.org, mel@skynet.ie, jbglaw@lug-owl.de
In-reply-to: <4BF47D56A0DD2346A1B8D622C5C5902C53FAF5@soc-mail.soc-soft.com>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <4BF47D56A0DD2346A1B8D622C5C5902C53FAF5@soc-mail.soc-soft.com>
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On Thu, Feb 17, 2005 at 10:40:22AM +0530, Rishabh@soc-soft.com wrote:

First, fix your mailer setup, it's littering emails with extra carriage
returns.

> I have been working on HIGHMEM fixation for 2.4.20 linux MVL kernel for
> MIPS architecture.
> I am getting DATA BUS ERROR(ADDR: 0xffffd000) exception when loading
> (copying the data received from ethernet to the kernel space in FIXADDR
> SPACE) "/sbin/init" from TARGET ROOT DIR (through NFS). I figured out
> that this is because there is no corresponding page table entry for the
> same.

That does not make sense.  If you don't have a pagetable entry the CPU will
take a TLB reload exception.  If the entry is invalid, the kernel will
die with an oops.  A bus error has different causes.

  Ralf

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