Date: Sun, 17 May 2020 12:14:16 -0700 From: Thomas Skibo <thomas-bsd@skibo.net> To: freebsd-arm@freebsd.org Subject: Re: need help w/ Cora-Z7, XC7Z007S Zynq board Message-ID: <20200517191416.GA1194@piedmont> In-Reply-To: <20200517063853.GI4213@funkthat.com> References: <20200516221344.GH4213@funkthat.com> <20200517063853.GI4213@funkthat.com>
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On Sat, May 16, 2020 at 11:38:53PM -0700, John-Mark Gurney wrote:
>
> After a bit of digging, I think I have found the solution. It looks
> like slcr is suppose to be set to the frequency of the ps clk, which
> is 50 MHz, and then the global_timer is suppose to be set to half the
> CPU clock frequency, which on this board is, I believe, 650 MHz, so
> using the following in the dts made things work:
> &slcr {
> clock-frequency = <50000000>;
> };
>
> &global_timer {
> clock-frequency = <325000000>;
> };
>
> ping times look good sane (after I realized that wifi has a tad slower),
> and I've been running ntpd for over 20 minutes, and it hasn't bombed
> out yet, and the offset/jitter look good.
>
> --
> John-Mark Gurney Voice: +1 415 225 5579
>
> "All that I will do, has been done, All that I have, has not."
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sysctl hw.zynq will tell you the ARM PLL frequency. It is probably set
to 1300 Mhz so 325 Mhz is the correct global timer frequency.
--Thomas
--
=====
Thomas Skibo
thomas-bsd@skibo.net
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