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.
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.
Hi,
Adding Santosh to Cc on this one.
* Stefan Hengelein <[email protected]> [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.
> 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?
Regards,
Tony
On 2/25/2015 9:14 AM, Tony Lindgren wrote:
> Hi,
>
> Adding Santosh to Cc on this one.
>
> * Stefan Hengelein <[email protected]> [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