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

[Holger Brunck <holger.brunck@keymile.com>]

Hi Tom,

On 03/13/2015 03:34 PM, Tom Rini wrote:
> On Fri, Mar 13, 2015 at 09:48:56AM -0400, Tom Rini wrote:
>> On Wed, Mar 11, 2015 at 09:51:38AM +0100, Stefan Roese wrote:
>>
>>> Without this dcache_flush the updated bootcounter may not be saved to
>>> its location.
>>>
>>> This was detected on an iMX.6 platform using the OCRAM (internal SRAM)
>>> as bootcounter storage area. And issuing "reset" from within U-Boot
>>> cause the bootcounter to stay on its initial value.
>>>
>>> Signed-off-by: Stefan Roese <sr@denx.de>
>>> Reviewed-by: Tom Rini <trini@konsulko.com>
>>
>> OK, this breaks some platforms:
>>    powerpc:  +   TQM850L
>> +(TQM850L) drivers/built-in.o: In function `bootcount_store':
>> +(TQM850L) build/../drivers/bootcount/bootcount.c:64: undefined reference to `flush_dcache_range'
>> +(TQM850L) make[1]: *** [u-boot] Error 1
>> +(TQM850L) make: *** [sub-make] Error 2
>>
>> We'll see how many others have the same problem soon and then I'll
>> decide on nuking the old platforms of holding off on this change.
> 
> Aside from the TQM 8xx family that Wolfgang owns we have mgcoge and
> mgcoge3ne also breaking from this
> (http://patchwork.ozlabs.org/patch/448849/) change.  Wolfgang, Holger,
> how do you want to proceed?  We either need cache operations or dropping
> bootcount from the platforms or dropping the platforms.
> 

we still would like to keep mgcoge and mgcoge3ne support. These boards are still
in maintenance. Unfortunately this week we are very busy. Next week Valentin or
myself have planned to find some time to look at this.

Regards
Holger