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Fri, 19 Mar 2021 18:13:55 +0000 Received: by smtp410.mail.bf1.yahoo.com (VZM Hermes SMTP Server) with ESMTPA ID 9ba326f26a95b7afe0f71eef7a364d2f; Fri, 19 Mar 2021 18:13:52 +0000 (UTC) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.60.0.2.21\)) Subject: Re: RPI4 clock speeds and serial port ( temperatures idle and -j4 buildworld buildkernel ) From: Mark Millard In-Reply-To: <20210319174359.GA38899@www.zefox.net> Date: Fri, 19 Mar 2021 11:13:49 -0700 Cc: freebsd-arm Content-Transfer-Encoding: quoted-printable Message-Id: <9DB699E3-5977-4651-B3D2-26343F202F2D@yahoo.com> References: <20210318170053.GA26688@www.zefox.net> <9FFA0A51-C0B7-4121-95CA-B98669809007@yahoo.com> <81AC0353-258C-41C3-86B1-C133E33D97E3@yahoo.com> <20210319174359.GA38899@www.zefox.net> To: bob prohaska X-Mailer: Apple Mail (2.3654.60.0.2.21) X-Rspamd-Queue-Id: 4F2BqB5xBFz3PDL X-Spamd-Bar: --- X-Spamd-Result: default: False [-3.50 / 15.00]; FREEMAIL_FROM(0.00)[yahoo.com]; MV_CASE(0.50)[]; R_SPF_ALLOW(-0.20)[+ptr:yahoo.com]; TO_DN_ALL(0.00)[]; DKIM_TRACE(0.00)[yahoo.com:+]; RCPT_COUNT_TWO(0.00)[2]; DMARC_POLICY_ALLOW(-0.50)[yahoo.com,reject]; NEURAL_HAM_SHORT(-1.00)[-1.000]; FROM_EQ_ENVFROM(0.00)[]; RCVD_TLS_LAST(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[yahoo.com]; ASN(0.00)[asn:36647, ipnet:98.137.64.0/20, country:US]; RBL_DBL_DONT_QUERY_IPS(0.00)[98.137.65.83:from]; DWL_DNSWL_NONE(0.00)[yahoo.com:dkim]; MID_RHS_MATCH_FROM(0.00)[]; ARC_NA(0.00)[]; R_DKIM_ALLOW(-0.20)[yahoo.com:s=s2048]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; FROM_HAS_DN(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; MIME_GOOD(-0.10)[text/plain]; SPAMHAUS_ZRD(0.00)[98.137.65.83:from:127.0.2.255]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[98.137.65.83:from]; RWL_MAILSPIKE_POSSIBLE(0.00)[98.137.65.83:from]; RCVD_COUNT_TWO(0.00)[2]; MAILMAN_DEST(0.00)[freebsd-arm] X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Porting FreeBSD to ARM processors List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 19 Mar 2021 18:13:59 -0000 On 2021-Mar-19, at 10:43, bob prohaska wrote: > On Thu, Mar 18, 2021 at 10:14:26PM -0700, Mark Millard wrote: >>=20 >> World build completed on Thu Mar 18 21:31:44 PDT 2021 >> World built in 29705 seconds, ncpu: 4, make -j4 >> . . . >> Kernel build for GENERIC-NODBG completed on Thu Mar 18 22:10:02 PDT = 2021 >> Kernel(s) GENERIC-NODBG built in 2298 seconds, ncpu: 4, make -j4 >>=20 >> So somewhat under 9 hours. >>=20 >=20 > So my figures (~17 hours) seem reasonable for a default clocking. > I thought maybe I'd done something wrong. >=20 > For now I'll leave the clocking alone. But some puzzles remain: > It appears that the CPU and the GPU have separate clocks. Can they > be set separately, and does the GPU have any practical effect on > FreeBSD's behavior once boot is complete?=20 See: = https://www.raspberrypi.org/documentation/configuration/config-txt/overclo= cking.md It says that setting gpu_freq sets core_freq and also says: QUOTE Changing core_freq in config.txt is not supported on the Pi 4 any change from the default will almost certainly cause a failure to boot. END QUOTE and: QUOTE It is recommended when overclocking to use the individual frequency settings (isp_freq, v3d_freq etc) rather than gpu_freq, as since it attempts to set core_freq (which cannot be changed on] the Pi 4), it is not likely to have the desired effect. END QUOTE There is more about the relationships to hdmi_enable_4kp60 and enable_tvout. =3D=3D=3D Mark Millard marklmi at yahoo.com ( dsl-only.net went away in early 2018-Mar)