On 2015-07-01, Christopher Sean Hilton <[email protected]> wrote: >> Regarding the net4801, CPU_SOEKRIS and CPU_ELAN_* only appear to >> concern the GPIO port, so if you don't hook up anything there, my >> best guess is that a standard install with GENERIC should work just >> fine. > > The net4801 is supposed to be perfect as an inexpensive gps driven > clock for ntpd. But I thought that having CPU_ELAN and CPU_ELAN_PPS in > the kernel added precision to the timekeeping?
Looking again, I see that it's the net4501 that is based on the AMD ElanSC520. The net4801 has an NSC SC1100 and is thus completely unaffected by CPU_ELAN_*. FreeBSD's special Elan support is concentrated in a single file, sys/i386/i386/elan-mmcr.c: https://svnweb.freebsd.org/base/stable/10/sys/i386/i386/elan-mmcr.c?view=log CPU_ELAN_PPS is only of interest if you want to precisely timestamp a PPS signal on a GPIO pin. CPU_ELAN_XTAL is for people who want to run the CPU from a different clock. CPU_ELAN just pulls in the support for the other CPU_ELAN_* defines. -- Christian "naddy" Weisgerber [email protected] _______________________________________________ Soekris-tech mailing list [email protected] http://lists.soekris.com/mailman/listinfo/soekris-tech
