linux-kernel - Re: [PATCH 4/6] pstore/ram: Add some more documentation and examples

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Date:	Wed, 16 May 2012 10:56:09 -0700
From:	Colin Cross <ccross@...roid.com>
To:	Anton Vorontsov <anton.vorontsov@...aro.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Kees Cook <keescook@...omium.org>,
	Tony Luck <tony.luck@...el.com>, Arnd Bergmann <arnd@...db.de>,
	John Stultz <john.stultz@...aro.org>,
	Shuah Khan <shuahkhan@...il.com>, arve@...roid.com,
	Rebecca Schultz Zavin <rebecca@...roid.com>,
	Jesper Juhl <jj@...osbits.net>,
	Randy Dunlap <rdunlap@...otime.net>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Thomas Meyer <thomas@...3r.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Marco Stornelli <marco.stornelli@...il.com>,
	WANG Cong <xiyou.wangcong@...il.com>,
	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
	linaro-kernel@...ts.linaro.org, patches@...aro.org,
	kernel-team@...roid.com
Subject: Re: [PATCH 4/6] pstore/ram: Add some more documentation and examples

On Wed, May 16, 2012 at 5:56 AM, Anton Vorontsov
<anton.vorontsov@...aro.org> wrote:
> Suggested-by: Shuah Khan <shuahkhan@...il.com>
> Signed-off-by: Anton Vorontsov <anton.vorontsov@...aro.org>
> ---
>  Documentation/ramoops.txt |   15 +++++++++++++++
>  1 file changed, 15 insertions(+)
>
> diff --git a/Documentation/ramoops.txt b/Documentation/ramoops.txt
> index 4ba7db2..138823b 100644
> --- a/Documentation/ramoops.txt
> +++ b/Documentation/ramoops.txt
> @@ -40,6 +40,12 @@ corrupt, but usually it is restorable.
>  Setting the ramoops parameters can be done in 2 different manners:
>  1. Use the module parameters (which have the names of the variables described
>  as before).
> + For quick debugging, you can also reserve parts of memory during boot
> + and then use the reserved memory for ramoops. For example, assuming a machine
> + with > 128 MB of memory, the following kernel command line will tell the
> + kernel to use only the first 128 MB of memory, and place ECC-protected ramoops
> + region at 128 MB boundary:
> + "mem=128M ramoops.mem_address=0x8000000 ramoops.ecc=1"
>  2. Use a platform device and set the platform data. The parameters can then
>  be set through that platform data. An example of doing that is:
>
> @@ -70,6 +76,15 @@ if (ret) {
>        return ret;
>  }
>
> +You can specify either RAM memory or peripheral devices' memory. However, when
> +specifying RAM, be sure to reserve the memory by issuing memblock_reserve()
> +very early in the architecture code, just before platform device registration,

Just before platform device registration is way too late.  ARM
provides a machine reserve callback to allow board files to call
memblock_reserve inside arm_memblock_init() and before mm_init().

> +e.g.:
> +
> +#include <linux/memblock.h>
> +
> +memblock_reserve(ramoops_data.mem_address, ramoops_data.mem_size);
> +
>  3. Dump format
>
>  The data dump begins with a header, currently defined as "====" followed by a
> --
> 1.7.9.2
>
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