[U-Boot] [PATCH v2 12/23] sunxi: provide default DRAM config for sun50i in Kconfig

[Maxime Ripard]

On Tue, Dec 06, 2016 at 11:21:26AM +0000, Andre Przywara wrote:
> Hi,
> 
> On 06/12/16 10:56, Maxime Ripard wrote:
> > On Mon, Dec 05, 2016 at 01:52:19AM +0000, Andre Przywara wrote:
> >> To avoid enumerating the very same DRAM values in defconfig files
> >> for each and every Allwinner A64 board out there, let's put some sane
> >> default values in the Kconfig file.
> >> Boards with different needs can override them at any time.
> > 
> > Did you check other boards to see what their values were before
> > calling it a default?
> 
> I sampled all the boards (two ;-) I have access to and got a 100%
> coverage ;-)
> As far as I know, this 672 MHz seems to be an Allwinner recommendation,
> though it needs to be worked out how stable this is under load.
> I have no idea if the ZQ value is similarly common.
> 
> If you have any other data, I am all ears and happy to use a different
> safe default if this is the intention.
> But we could use a "most common value" approach here to avoid pointless
> defconfig entries with the same value for lots of boards, so even if
> there are board with can't do 672 MHz, for instance, we still put it in
> Kconfig and let that one board override it.

Fair enough.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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