From: Ralf Baechle <ralf-6z/3iImG2C8G8FEW9MqTrA@public.gmane.org>
To: Andrew Bresticker <abrestic-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
Cc: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>,
"devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Linux-MIPS <linux-mips-6z/3iImG2C8G8FEW9MqTrA@public.gmane.org>,
Ezequiel Garcia
<ezequiel.garcia-1AXoQHu6uovQT0dZR+AlfA@public.gmane.org>,
James Hartley
<james.hartley-1AXoQHu6uovQT0dZR+AlfA@public.gmane.org>,
James Hogan <james.hogan-1AXoQHu6uovQT0dZR+AlfA@public.gmane.org>,
Lars-Peter Clausen <lars-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>
Subject: Re: [PATCH 2/5] MIPS: Allow platforms to specify the decompressor load address
Date: Tue, 24 Feb 2015 23:42:57 +0100 [thread overview]
Message-ID: <20150224224257.GB9748@linux-mips.org> (raw)
In-Reply-To: <CAL1qeaHSErgc=W4mGhDAm7cu_J4wrOik27joB0Rd-2P7dk=QuA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
On Tue, Feb 24, 2015 at 01:39:03PM -0800, Andrew Bresticker wrote:
> It is the same sort of issue, though I think the only way to solve it
> on MIPS would be to copy the image to the address it was linked at,
> which could be problematic if there's overlap. There's also the cache
> maintenance we'd have to do, which varies from CPU to CPU (and more so
> the ARM I believe).
On MIPS it's significantly less complex to implement than the in-kernel
cache maintenance code because only one flush operation needs to be
implemented that will be invoked only once so performance is less of
an issue. Also oddball hardware such as the S-caches controlled by
an external controller can be ignored for purpose of kernel decomporession.
That pretty much leaves to treat the standard R4000 style of caches
and a few oddballs like R2000 class processors.
Ralf
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next prev parent reply other threads:[~2015-02-24 22:42 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-24 1:31 [PATCH 0/5] MIPS: Initial IMG Pistachio SoC support Andrew Bresticker
2015-02-24 1:31 ` [PATCH 1/5] MIPS: Create a common <asm/mach-generic/war.h> Andrew Bresticker
2015-02-24 1:31 ` [PATCH 2/5] MIPS: Allow platforms to specify the decompressor load address Andrew Bresticker
2015-02-24 8:15 ` Arnd Bergmann
2015-02-24 21:39 ` Andrew Bresticker
[not found] ` <CAL1qeaHSErgc=W4mGhDAm7cu_J4wrOik27joB0Rd-2P7dk=QuA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-02-24 22:42 ` Ralf Baechle [this message]
2015-02-24 1:31 ` [PATCH 3/5] MIPS: Document Pistachio boot protocol and device-tree bindings Andrew Bresticker
2015-02-24 1:31 ` [PATCH 4/5] MIPS: Add support for the IMG Pistachio SoC Andrew Bresticker
2015-02-24 1:31 ` [PATCH 5/5] MIPS: pistachio: Add an initial defconfig Andrew Bresticker
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