On Mon, Mar 07, 2016 at 03:50:11PM +0200, Siarhei Siamashka wrote:
On Mon, 7 Mar 2016 13:44:11 +0100 Maxime Ripard maxime.ripard@free-electrons.com wrote:
From: Boris Brezillon boris.brezillon@free-electrons.com
Unlike the datasheet recommendation, the R8 SoC requires a 1.4V supply for its CPU when operating at 1Ghz.
That's interesting. Is this R8 SoC datasheet with the Allwinner recommended cpufreq operating points available in public access somewhere?
Yeah: https://github.com/NextThingCo/CHIP-Hardware/tree/master/CHIP%5Bv1_0%5D/CHIP...
But note that it's the usual datasheet from Allwinner, you don't have a list of operating points.
Are they really recommending 1008MHz @1.3V there?
It was a misunderstanding on our side. We thought that the nominal tension was the recommended one, and our prototypes were running just fine with it. Later samples (probably from a different batch) turned out to have memory corruptions because of the lower voltage.
Maxime