[U-Boot] [PATCH 1/3] MIPS: Move cache sizes to Kconfig

[Marek Vasut <marex@denx.de>]

On 05/27/2016 12:36 PM, Paul Burton wrote:
> On Thu, May 26, 2016 at 06:10:38PM +0200, Marek Vasut wrote:
>>> diff --git a/arch/mips/lib/cache.c b/arch/mips/lib/cache.c
>>> index 7482005..7695325 100644
>>> --- a/arch/mips/lib/cache.c
>>> +++ b/arch/mips/lib/cache.c
>>> @@ -9,7 +9,7 @@
>>>  #include <asm/cacheops.h>
>>>  #include <asm/mipsregs.h>
>>>  
>>> -#ifdef CONFIG_SYS_CACHELINE_SIZE
>>> +#if CONFIG_SYS_CACHELINE_SIZE != 0
>>
>> Wouldn't it make more sense to introduce something like
>> CONFIG_HAVE_CACHE_SUPPORT instead , so you don't need this
>> #if CONFIG_FOO != 0 construct all over the place ?
> 
> Hi Marek,
> 
> It's not about whether cache support is present (we always build cache
> support), it's about whether we are hardcoding the sizes of the caches
> or detecting them at runtime. The latter is especially useful on
> FPGA-based platforms like Malta where the CPU (& caches) can change. I
> suppose I could add something like CONFIG_SYS_CACHE_SIZE_AUTO, but I
> still think it would be cleanest to have that default to a value based
> upon whether a board has set a non-zero size for any of the caches.

Auto-detecting cacheline size is cool, but that'd need much more work.
Just grep through drivers/ for CONFIG_SYS_CACHELINE_SIZE and you'll
see a lot of code depends on non-zero value in it. Setting it to zero
will just bite you at some point in a nasty way.

>> Cool stuff otherwise, thanks!
> 
> Thanks,
>     Paul
> 


-- 
Best regards,
Marek Vasut