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

[Tom Rini]

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 at denx.de>
> > Reviewed-by: Tom Rini <trini at 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.

Frankly, after looking at most of arch/powerpc/cpu/*/cache.c I suspect
8xx and 83xx just need the dummy files copied over.

Thanks!

-- 
Tom
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