linux-kernel - Re: [PATCH] ramoops appears geared to not support ARM

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Message-ID: <4EAFB34D.8080807@gmail.com>
Date:	Tue, 01 Nov 2011 09:52:29 +0100
From:	Marco Stornelli <marco.stornelli@...il.com>
To:	Bryan Freed <bfreed@...omium.org>
CC:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	msb@...omium.org, seiji.aguchi@....com
Subject: Re: [PATCH] ramoops appears geared to not support ARM

Il 01/11/2011 00:03, Bryan Freed ha scritto:
> On Mon, Oct 31, 2011 at 1:57 AM, Marco Stornelli
>>> And I cannot shake the feeling that we have a fairly simple disconnect
>>> here.  Ramoops expects to use _device_ memory because it uses
>>> ioremap().  But the buffer itself is accessed through /dev/mem which
>>> (as we use it with no mmap() calls) expects to give access to _system_
>>
>> no mmap calls?! I don't understand how you are using /dev/mem.
>
> open(), lseek(), read().  No mmap is required for RAM, right?
> dd if=/dev/mem bs=1 count=1000 skip=32M
>

Mmmm, the operations done are different. Try: reserve the memory with 
memblock_reserve and read some data with this useful program 
http://free-electrons.com/pub/mirror/devmem2.c from the right location 
(the address used for ramoops).

Let me know.

Marco
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