[U-Boot] bootcount: Add dcache flush to bootcount_store()

[York Sun <yorksun@freescale.com>]

On 03/16/2015 10:05 AM, Tom Rini wrote:
>>>> 8xx and 83xx just need the dummy files copied over.
>>>
>>> OK, I went and poked at going one direction on this and then dug into
>>> the higher level problem more.  PowerPC _needs_ the current kernel's
>>> arch/powerpc/kernel/misc_32.S relevant cache functions ported over for
>>> everyone and we should kill the dummy functions we have today.  To try
>>> and encourage some folks to do this I'm going to drop this bootcount
>>> patch for now.
>>>
>>
>> FWIW, powerpc mpc83xx, mpc85xx, mpc86xx all have flush_dcache_range() function
>> defined.
> 
> Yes and no:
> $ git grep -l flush_dcache_range arch/powerpc/
> arch/powerpc/cpu/mpc512x/cache.c
> arch/powerpc/cpu/mpc5xxx/cache.c
> arch/powerpc/cpu/mpc83xx/cache.c
> arch/powerpc/cpu/mpc85xx/cache.c
> arch/powerpc/cpu/mpc86xx/cache.S
> arch/powerpc/cpu/ppc4xx/cache.S
> 
> Of these only ppc4xx and mpc86xx are real functions, borrowed from the
> kernel long long ago.  The rest are dummy functions.  And we should
> instead make everyone have the same real functions the kernel does :)
> 

Ah! I was under the impression we use it. But we actually used flush_cache()
function.

York