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Re: mips32 kernel memory mapping

To: Srinivas Kommu <>
Subject: Re: mips32 kernel memory mapping
From: "Maciej W. Rozycki" <>
Date: Fri, 23 Jul 2004 13:51:34 +0200 (CEST)
In-reply-to: <>
Original-recipient: rfc822;
References: <>
On Fri, 23 Jul 2004, Srinivas Kommu wrote:

> Can a 32-bit mips kernel access beyond KSEG0 contiguously? I have a Sibyte 
> 1250 with 1 Gig RAM, but only 256 MB is located at phyical 0x0. The rest is 
> all located at 0x8000_0000. Does that mean the kernel can access only 256 
> meg contiguously? Do I need to enabled CONFIG_HIGHMEM to even reach the 
> remaining RAM? It appears Highmem gives me only a 4 meg window at a time. 

 The BCM1250A is a 64-bit processor.  What's the problem with using 64-bit
Linux avoiding the hassle altogether?

> Can't I set up a page mapping into KSEG2 for the rest of the memory? KSEG2 
> seems to be unused from what I read.

 KSEG2 is used for modules.


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