Re: [PATCH] ARM: dts: rockchip: Reserve unusable memory region on rk3066

From: "Paweł Jarosz" <paweljarosz3691-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: "Huang, Tao" <huangtao-TNX95d0MmH7DzftRWevZcw@public.gmane.org>,
	heiko-4mtYJXux2i+zQB+pC5nmwQ@public.gmane.org,
	linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
	linux-rockchip-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
Subject: Re: [PATCH] ARM: dts: rockchip: Reserve unusable memory region on rk3066
Date: Thu, 13 Oct 2016 10:55:17 +0200	[thread overview]
Message-ID: <95e45ae4-f8cd-c7e0-4f3e-0ad0a5183078@gmail.com> (raw)
In-Reply-To: <e3746f9a-084e-163e-a412-1a1fc66926d5-TNX95d0MmH7DzftRWevZcw@public.gmane.org>

Hi

W dniu 13.10.2016 o 09:12, Huang, Tao pisze:
> Hi, Paweł:
> On 2016年10月10日 17:11, Paweł Jarosz wrote:
>> W dniu 10.10.2016 o 09:18, Huang, Tao pisze:
>>> Our IC guy need us tell them which master can not access such area, DMA
>>> or EMMC Controller or GPU, etc? Could you tell me how to reproduce such
>>> issue?
>>> And we can confirm CPU core can access this memory through /dev/mem and
>>> the test board is 1GB too. Personally, I don't think RK3066 has such
>>> limit because when we verify this chip, we don't found such limit at all.
>>>
>>> Thanks,
>>> Huang, Tao
>> I'm getting this on Ubuntu 16.04 with mainline kernel.
>> My board always freezes when i type: "memtester 800M"
>>
> We try run memtest 800M with Linux kernel 4.8, which killed by OOM.
> But if we run:
> # memtester -p 0x9F000000 16K 1
> memtester version 4.3.0 (32-bit)
> Copyright (C) 2001-2012 Charles Cazabon.
> Licensed under the GNU General Public License version 2 (only).
>
> pagesize is 4096
> pagesizemask is 0xfffff000
> want 0MB (16384 bytes)
> Loop 1/1:
>     Stuck Address       : ok
>     Random Value        : ok
>     Compare XOR         : ok
>     Compare SUB         : ok
>     Compare MUL         : ok
>     Compare DIV         : ok
>     Compare OR          : ok
>     Compare AND         : ok
>     Sequential Increment: ok
>     Solid Bits          : ok
>     Block Sequential    : ok
>     Checkerboard        : ok
>     Bit Spread          : ok
>     Bit Flip            : ok
>     Walking Ones        : ok
>     Walking Zeroes      : ok
>     8-bit Writes        : ok
>     16-bit Writes       : ok
>
> So these memory should be fine to CPU core. Maybe your system just
> freeze because out of memory.
>

weird ... memtester -p 0x9F000000 16K 1 gave me the same result.

Could you try one last command:

	memtester 400M

Values > 200M causing freeze.

If this won't do it, than maybe there is something wrong with my board.

Thanks for your time.

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