Date: Thu, 26 Sep 2013 19:43:39 -0700 From: Tim Kientzle <kientzle@freebsd.org> To: ticso@cicely.de Cc: freebsd-arm@freebsd.org Subject: Re: FreeBSD on Cubieboard 2, UDOO and Galaxy Note 10.1 (Exynos). Message-ID: <8F8B0558-4B7A-4BC6-BF93-A89E5533C567@freebsd.org> In-Reply-To: <20130926223120.GM65622@cicely7.cicely.de> References: <C085FFE7-994E-4371-B754-4846008E2048@yahoo.de> <CAGtf9xPDSy38_zDZssnfA8qqJjwUCQ_3yfoAm7DKYEzN3tdwUQ@mail.gmail.com> <1378866956.1111.608.camel@revolution.hippie.lan> <F7549C24-7B19-402A-914D-B70C9E483EA4@yahoo.de> <1379101800.1111.642.camel@revolution.hippie.lan> <20130926223120.GM65622@cicely7.cicely.de>
next in thread | previous in thread | raw e-mail | index | archive | help
On Sep 26, 2013, at 3:31 PM, Bernd Walter <ticso@cicely7.cicely.de> wrote: > I also noted that the Beaglebone Black seems to run at 550MHz only. > I've found out from NetBSD mailinglist, that the PLL must be > reprogrammed for higer frequency and the core voltage needs adjustment > too. > Of those 3 boards the BBB was the only board mention CPU frequency at all. I've not looked into the code required, but I know some of the issues: * For the older "white" Beaglebone, at least, the CPU frequency needs to be set properly depending on the power supply. So "someone" needs to read the PMIC and determine whether power is coming from the 5V input or from USB. In the latter case, I believe the lower frequency may be appropriate. * For BB White, I believe the "someone" was U-Boot; the FreeBSD kernel just assumed the CPU was already properly initialized. I haven't looked to see if the U-Boot we're using now does power config for BBB. * We should add a PMIC driver and do this setting in our kernel. Tim
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?8F8B0558-4B7A-4BC6-BF93-A89E5533C567>