linux-kernel - Re: Dead Kconfig Option OMAP4_ERRATA

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Date:	Wed, 25 Feb 2015 09:24:50 -0800
From:	santosh shilimkar <santosh.shilimkar@...cle.com>
To:	Tony Lindgren <tony@...mide.com>,
	Stefan Hengelein <stefan.hengelein@....de>
CC:	linux@....linux.org.uk, linux-arm-kernel@...ts.infradead.org,
	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
	Greg KH <gregkh@...uxfoundation.org>
Subject: Re: Dead Kconfig Option OMAP4_ERRATA_I688

On 2/25/2015 9:14 AM, Tony Lindgren wrote:
> Hi,
>
> Adding Santosh to Cc on this one.
>
> * Stefan Hengelein <stefan.hengelein@....de> [150225 09:13]:
>> During the research for my masters thesis i came across the
>> OMAP4_ERRATA_I688 option and realized, it is never possible to enable
>> this option.
>>
>> The a62a6e98 commit added the "&& !ARCH_MULTIPLATFORM" dependency to
>> disable this option for multiplatforms. However, because of enclosing
>> dependencies, this option isn't available for non-MULTIPLATFORM
>> configurations either.
>
> Yes there is no clean way currently to enable this errata for
> multiplatform.
>
Right.To fix this, the barrier code needs to be run-time patched.

>> CONFIG_OMAP4_ERRATA_I688 is defined in the menu "TI OMAP/AM/DM/DRA
>> Family" which depends on ARCH_MULTI_V6 || ARCH_MULTI_V7. (in
>> arch/arm/mach-omap2/Kconfig)
>>
>> ARCH_MULTI_V6 and ARCH_MULTI_V7 however are defined in the menu
>> "Multiple platform selection" which depends on ARCH_MULTIPLATFORM (in
>> arch/arm/Kconfig)
>>
>> Which is a contradiction.
>>
>> There are no selects on OMAP4_ERRATA_I688, which would ignore
>> dependencies, either.
>>
>> The question is:
>> Was disabling this option for non-MULTIPLATFORM configurations also intentional?
>>
>> i have added a minimal example of the problem.
>
>  From what I remember the plan was to try to come up with a
> multiplatform friendly way of doing this errata. Santosh,
> any suggestions here? Should we just remove the code as it
> seems nobody has complained about it for a few years now?
>
I have to agree to with you on this.

Regards,
Santosh
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