From: "Shilimkar, Santosh" <santosh.shilimkar@ti.com>
To: Roger Quadros <rogerq@ti.com>
Cc: "Dechesne, Nicolas" <n-dechesne@ti.com>,
"linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>
Subject: Re: L2 cache stability workaround for 4460 ES1.0
Date: Mon, 2 Apr 2012 14:43:29 +0530 [thread overview]
Message-ID: <CAMQu2gxYN=+ghqpq5odKDYcAyzn_6uLk7UdjXQt_7dePh5cZVQ@mail.gmail.com> (raw)
In-Reply-To: <4F795D02.8010705@ti.com>
On Mon, Apr 2, 2012 at 1:32 PM, Roger Quadros <rogerq@ti.com> wrote:
> On 04/02/2012 10:58 AM, Shilimkar, Santosh wrote:
>> On Mon, Apr 2, 2012 at 1:25 PM, Roger Quadros <rogerq@ti.com> wrote:
>>> On 04/02/2012 10:38 AM, Shilimkar, Santosh wrote:
>>>> On Mon, Apr 2, 2012 at 12:25 PM, Roger Quadros <rogerq@ti.com> wrote:
>>>>> Hi Santosh,
>>>>>
>>>>> I came across the attached patch from you. I also came across this post
>>>>> stating that it was decided not to send this patch upstream.
>>>>>
>>>>> http://www.digipedia.pl/usenet/thread/18885/8437/#post8496
>>>>>
>>>>> The problem is that we have to keep porting this patch each time we
>>>>> update the kernel.
>>>>>
>>>>> Do you know if the root cause has been found? If not can we have this
>>>>> patch upstream till the root cause is found?
>>>>>
>>>> Yes and fixed in OMAP4460 ES1.2.
>>>
>>> Did you mean ES1.1?
>>>
>> yep. Sorry for the typo.
>>
>>> Could you please point me to the errata ID? The only cache related
>>> errata I can see is Errata ID: i690
>>>
>>>>
>>>>> It seems the patch at least makes the kernel usable on ES1.0.
>>>>>
>>>> I know but that still is not enough. It's like 80 % WA of the issue
>>>> seen on ES1.0. We are not suppose to have many boards with
>>>> ES1.0
>>>>
>>> Even better if there are not many boards. It seems most of the boards
>>> will be with TI. I think we should have the fix in even if it is not
>>> 100% fix.
>>>
>>> What do you say?
>>>
>> My request is to get rid of ES1.0 board because the WA just
>> not completely correct. Don't feel patching kernel for silicon
>> which is not suppose to be used nether has complete WA
>> to support it.
>>
> OK Santosh. seems like cache is broken bad on ES1.0.
>
> Is it possible to disable the cache for ES1.0 and print a warning
> message about it?
>
Let's not add that support. See there are very few boards in
TI where ES1.0 is used so I suggest those users keep using
whatever works for them. Disable or the partial WA.
Regards
Santosh
prev parent reply other threads:[~2012-04-02 9:13 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-02 6:55 L2 cache stability workaround for 4460 ES1.0 Roger Quadros
2012-04-02 7:38 ` Shilimkar, Santosh
2012-04-02 7:55 ` Roger Quadros
2012-04-02 7:58 ` Shilimkar, Santosh
2012-04-02 8:02 ` Roger Quadros
2012-04-02 9:13 ` Shilimkar, Santosh [this message]
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