Date: Mon, 30 Sep 2013 04:01:11 +0800 From: Jia-Shiun Li <jiashiun@gmail.com> To: ticso@cicely.de Cc: "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: BBB CPU clock (was: Re: FreeBSD on Cubieboard 2, UDOO and Galaxy Note 10.1 (Exynos). Message-ID: <CAHNYxxP7tc1a8W-uiL5A05qTo4wZzuydg3dtcEJWQtaxG_-grw@mail.gmail.com> In-Reply-To: <CAHNYxxPtD5vgrohumwccoC_5bZv7fuV3RYK2vgLUpyEZCmOgqg@mail.gmail.com> References: <CAHNYxxPtD5vgrohumwccoC_5bZv7fuV3RYK2vgLUpyEZCmOgqg@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Mon, Sep 30, 2013 at 12:41 AM, Jia-Shiun Li <jiashiun@gmail.com> wrote: > But I manually modified registers using the sequence in mpu_pll_config() of > u-boot and got the MPU clocked at the value I gave. There seems to be some > unknown sequences in u-boot either skipping or overwriting MPU PLL settings. Never mind. Have to copy MLO in addition to u-boot.img as well. Looks like PLL init part is there. However, I cannot set MPU clock to 800 MHz and beyond. Now booting ok at 750MHz. Maybe a heat sink or active cooling is required. Will try when I get one. cpufreq for ARM boards may be possible provided frequency can be changed dynamically. But if the board cannot provide a way to determine stability reliability it may be impractical to make it automatic. Jia-Shiun.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CAHNYxxP7tc1a8W-uiL5A05qTo4wZzuydg3dtcEJWQtaxG_-grw>