From mboxrd@z Thu Jan 1 00:00:00 1970 From: Maxime Ripard Date: Tue, 8 Mar 2016 23:18:43 +0100 Subject: [U-Boot] [PATCH] sunxi: fix DCDC2 output in CHIP_defconfig In-Reply-To: <20160307155011.2dbc5485@i7> References: <1457354651-10083-1-git-send-email-maxime.ripard@free-electrons.com> <20160307155011.2dbc5485@i7> Message-ID: <20160308221843.GJ8418@lukather> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de On Mon, Mar 07, 2016 at 03:50:11PM +0200, Siarhei Siamashka wrote: > On Mon, 7 Mar 2016 13:44:11 +0100 > Maxime Ripard wrote: > > > From: Boris Brezillon > > > > 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 -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 819 bytes Desc: Digital signature URL: