[U-Boot] [PATCH] ARM: arm720t: Add missing CONFIG_SKIP_LOWLEVEL_INIT guard for cpu_init_crit

[Stephen Warren <swarren@wwwdotorg.org>]

On 05/15/2013 07:00 PM, Axel Lin wrote:
> 2013/5/15 Stephen Warren <swarren@wwwdotorg.org>:
>> On 05/14/2013 09:04 PM, Axel Lin wrote:
>>> cpu_init_crit() can be skipped, but the code is still enabled requiring a
>>> platform to supply lowlevel_init().
>>
>>> diff --git a/arch/arm/cpu/arm720t/start.S b/arch/arm/cpu/arm720t/start.S
>>
>>> +#ifndef CONFIG_SKIP_LOWLEVEL_INIT
>>>  cpu_init_crit:
>>>
>>>  #if !defined(CONFIG_TEGRA)
>>> @@ -258,6 +259,7 @@ cpu_init_crit:
>>>  #endif
>>>
>>>       mov     pc, lr
>>> +#endif /* CONFIG_SKIP_LOWLEVEL_INIT */
>>
>> If you're going to make changes here, you should probably ensure that
>> Tegra is setting CONFIG_SKIP_LOWLEVEL_INIT, and then remove the
>> Tegra-specific ifdef from the body of that function. That's assuming
>> that setting CONFIG_SKIP_LOWLEVEL_INIT doesn't have any other side-effects.
> 
> Tegra exists in both arm720t and armv7:
> 
> ./arch/arm/cpu/arm720t/tegra-common
> ./arch/arm/cpu/arm720t/tegra30
> ./arch/arm/cpu/arm720t/tegra20
> ./arch/arm/cpu/arm720t/tegra114
> 
> ./arch/arm/cpu/armv7/tegra-common
> ./arch/arm/cpu/armv7/tegra30
> ./arch/arm/cpu/armv7/tegra20
> ./arch/arm/cpu/armv7/tegra114
> 
> I'm wondering if we set CONFIG_SKIP_LOWLEVEL_INIT for tegra will also
> impact the code path in arch/arm/cpu/armv7/start.S ?

Yes, you certainly only want to set CONFIG_SKIP_LOWLEVEL_INIT for the
SPL build. There's a whole section of
include/configs/tegra-common-post.h which is ifdef CONFIG_SPL_BUILD, so
it might make sense to #define CONFIG_SKIP_LOWLEVEL_INIT there.