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.rip...@free-electrons.com> wrote: > > > From: Boris Brezillon <boris.brezil...@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/CHIPv1_0-BOM-Datasheets 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 -- Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com
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