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Re: VR4131 - MQ1132 - UPD63335

To: "Suresh. R" <>
Subject: Re: VR4131 - MQ1132 - UPD63335
From: Geert Uytterhoeven <>
Date: Fri, 16 Jan 2004 10:49:00 +0100 (MET)
Cc: Linux/MIPS Development <>
In-reply-to: <>
Original-recipient: rfc822;
References: <>
On Fri, 16 Jan 2004, Suresh. R wrote:
> I am writing a linux device driver for UPD63335 audio codec. Its
> controlled through the MQ1132 co-processor. The VR4131 is the processor.
> The memory of MQ1132 is mapped to the processor memory in Kseg1 (0xA000
> 0000 onwards) which the manual says is TLB Unmapped region. Now my
> question is is it necessary to map this region before using it in Linux.
> Actually I have WinCE code for my reference. In that code the programmer
> is mapping the region using Virtual Cpoy and Virtual Alloc. Is it
> necessary to do that or Can I directly address the memory locatoin.

From the Linux kernel, you can access all memory at 0xa0000000 'till 0xbfffffff



Geert Uytterhoeven -- There's lots of Linux beyond ia32 --

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                                            -- Linus Torvalds

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