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Date:   Thu, 9 Nov 2017 15:24:08 +0800
From:   Greentime Hu <>
To:     Arnd Bergmann <>
Cc:     Greentime <>,
        Linux Kernel Mailing List <>,
        linux-arch <>,
        Thomas Gleixner <>,
        Jason Cooper <>,
        Marc Zyngier <>,
        Rob Herring <>,
        Networking <>,
        Vincent Chen <>,
Subject: Re: [PATCH 20/31] nds32: L2 cache support

2017-11-08 17:48 GMT+08:00 Arnd Bergmann <>:
> On Wed, Nov 8, 2017 at 6:55 AM, Greentime Hu <> wrote:
>> From: Greentime Hu <>
>> Signed-off-by: Vincent Chen <>
>> Signed-off-by: Greentime Hu <>
>> +
>> +/* This is defined for head.S to use due to device tree is not yet built. */
>> +#define L2CC_PA_BASE           0x90F00000
> This looks problematic, since it prevents you from using the same head.S for
> multiple SoCs that have different L2 controllers or that have them at different
> addresses.
> What does head.S actually do to the L2CC? Could the boot protocol require
> that to be done by the boot loader before entering the kernel instead?

It will disable and invalidate L2 cache. I think we can do these
things in bootloader.
I will refine it in the next version patch.

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