linux-kernel - Re: [RFC PATCH] ARM: cache-l2x0: add setup entry for l2 in non-secure mode

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Date:	Mon, 19 May 2014 18:21:49 +0900
From:	Gioh Kim <gioh.kim@....com>
To:	Barry Song <21cnbao@...il.com>
CC:	Russell King <linux@....linux.org.uk>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Barry Song <Baohua.Song@....com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	이건호 <gunho.lee@....com>,
	Gi-Oh Kim <gurugio@...il.com>,
	DL-SHA-WorkGroupLinux <workgroup.linux@....com>
Subject: Re: [RFC PATCH] ARM: cache-l2x0: add setup entry for l2 in non-secure
 mode



2014-05-19 오후 6:11, Barry Song 쓴 글:
> 2014-05-19 8:29 GMT+08:00 Gioh Kim <gioh.kim@....com>:
>>
>>
>> 2014-05-18 오후 10:13, Barry Song 쓴 글:
>>
>>> 2014-05-15 13:39 GMT+08:00 Gioh Kim <gioh.kim@....com>:
>>>>
>>>>
>>>> Hi,
>>>>
>>>> My board is using Trustzone and running kernel is non-secure mode.
>>>> But setup function of PL310 driver is only for secure mode kernel.
>>>>
>>>> What about adding an entry for non-secure mode setup function?
>>>>
>>>> I'm sorry for my poor code but I just wanna say what I need .
>>>
>>>
>>> Gioh,
>>>
>>> i don't really understand what is the user scenarios for this, if you
>>> are running linux in non-secure mode, your security-mode codes have
>>> enabled L2, so this makes non-secure linux have no chance to execute
>>> setup at all:
>>
>>
>> My platform runs linux kernel before L2 cache activation.
>> And the L2 cache is activated when the kernel sends command to Trustzone
>> firmware.
>> At this moment L2 is not activated. Linux should send command for L2
>> activation to Trustzone at the moment.
>
> i think you can send command to trustzone firmware to enable L2 at
> first, then make your Linux l2 driver run.

Right. My platform is working like that.
Activate L2 first and run l2x0 driver.

But I think many platforms have trustzone firmware and are working like my platform.
They might need non-secure setup.

>
>
> -barry
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