On Thu, Feb 21, 2013 at 11:36 AM, Mark Jackson <mpfj-l...@mimc.co.uk> wrote: > Before I dig any deeper, can anyone tell me if the bootarg "mpurate" is meant > to > be supported for AM335x SoCs ? > > I've tried it on our custom board using 3v8, but no joy. > > The boot log shows:- > > [ 0.000000] Booting Linux on physical CPU 0x0 > [ 0.000000] Linux version 3.8.0-03059-g621553c-dirty (mpfj@mpfj-nanobone) > (gcc version 4.5.4 (Buildroot 2012.11) ) #113 SMP Thu Feb 21 16:29:48 GMT 2013 > [ 0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c53c7d > [ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing > instruction cache > [ 0.000000] Machine: Generic AM33XX (Flattened Device Tree), model: > Newflow NanoBone > [ 0.000000] Memory policy: ECC disabled, Data cache writeback > [ 0.000000] CPU: All CPU(s) started in SVC mode. > [ 0.000000] AM335X ES1.0 (neon ) > ... > [ 0.000000] Kernel command line: console=ttyO0,115200n8 mpurate=720 > root=/dev/mmcblk0p2 ro rootfstype=ext2 rootwait > ... > [ 0.001119] Calibrating delay loop... 364.48 BogoMIPS (lpj=1425408)
I don't think mpurate does anything on AM335x, though I could be wrong---just that I've not heard of anyone using it for any purpose. The BogoMIPS values don't seem to be very useful. I'm not sure of their purpose, but the hopefully useful information I can offer you is that if you are running a kernel supporting dynamic frequency scaling on AM335x, the number tends to be lower. > > I have seen other boot logs outputs [1] from other people where they are > getting nearly double that. > > Looking at omap2xxx_clk_arch_init(), only ompa24xx devices are supported. > > Am I missing something obvious (like it's not yet supported !!) ? Use the cpufreq tools to determine and set the frequency. > > Cheers > Mark J. > > [1] http://e2e.ti.com/support/embedded/linux/f/354/t/245316.aspx > -- > To unsubscribe from this list: send the line "unsubscribe linux-omap" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
