Date: Tue, 12 Jun 2007 21:54:30 -0600 (MDT) From: "M. Warner Losh" <imp@bsdimp.com> To: bkoenig@alpha-tierchen.de Cc: arm@freebsd.org Subject: Re: main clock frequency Message-ID: <20070612.215430.-365729166.imp@bsdimp.com> In-Reply-To: <55286.2001:6f8:101e:0:20e:cff:fe6d:6adb.1181705783.squirrel@webmail.alpha-tierchen.de>
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In message: <55286.2001:6f8:101e:0:20e:cff:fe6d:6adb.1181705783.squirrel@webmail.alpha-tierchen.de>
Björn_König <bkoenig@alpha-tierchen.de> writes:
: Hello,
:
: in at91_pmc_attach you're assume a certain main clock frequency. Isn't it
: reasonable to read this value from the main clock frequency register if it
: is available?
:
: I mean something like
:
: uint32_t mcfr = RD4(pmc_softc, CKGR_MCFR);
: if (mcfr & CKGR_MCFR_MAINRDY)
: at91_pmc_init_clock(pmc_softc, (mcfr & CKGR_MCFR_MAINF_MASK) * 32768 / 16);
: else
: /* fallback or error */
Yes. I think that's reasonable. I didn't do it because I didn't
think of it at the time I wrote the code.
Warner
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