[Top] [All Lists]

Re: Where does physical RAM start in kseg0?

To: Ralf Baechle <>
Subject: Re: Where does physical RAM start in kseg0?
From: "Erik J. Green" <>
Date: Sun, 13 Apr 2003 02:28:39 +0000
Cc: "" <>
In-reply-to: <>
Original-recipient: rfc822;
References: <> <>
User-agent: Internet Messaging Program (IMP) 4.0-cvs
Quoting Ralf Baechle <>:

Ralf wrote:
> There is no requirement at all for a system to have physical memory in
> KSEG0 - the Octane to my knowledge one example.  What every sane system
> needs to have in KSEG0 are exception handlers.  Of course they could also
> reside in a ROM but that's insane so you should expect at least a few kb
> of RAM at physical address zero.

At this point I wouldn't put anything past SGI, but it's good to know my 
suspicions about kseg0 are confirmed.
> Due to the Octane's funky address space layout and the current tools
> limitations the kernel will have to run in CKSEG2 instead of KSEG0 ...
>   Ralf

/nod.  Onward and upward.


Erik J. Green

<Prev in Thread] Current Thread [Next in Thread>