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Thu, 18 Mar 2021 21:22:08 +0000 Received: by smtp409.mail.bf1.yahoo.com (VZM Hermes SMTP Server) with ESMTPA ID 8ba0d1e98ecd1da649726c624e3de0da; Thu, 18 Mar 2021 21:22:05 +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 From: Mark Millard In-Reply-To: <20210318203835.GA83932@night.db.net> Date: Thu, 18 Mar 2021 14:21:58 -0700 Cc: bob prohaska , freebsd-arm@freebsd.org Content-Transfer-Encoding: 7bit Message-Id: References: <20210318170053.GA26688@www.zefox.net> <20210318180736.GA26853@www.zefox.net> <20210318203835.GA83932@night.db.net> To: Diane Bruce X-Mailer: Apple Mail (2.3654.60.0.2.21) X-Rspamd-Queue-Id: 4F1g2p0H2cz4nyG X-Spamd-Bar: --- X-Spamd-Result: default: False [-3.50 / 15.00]; TO_DN_SOME(0.00)[]; FREEMAIL_FROM(0.00)[yahoo.com]; MV_CASE(0.50)[]; R_SPF_ALLOW(-0.20)[+ptr:yahoo.com]; DKIM_TRACE(0.00)[yahoo.com:+]; DMARC_POLICY_ALLOW(-0.50)[yahoo.com,reject]; NEURAL_HAM_SHORT(-1.00)[-0.999]; 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)[98.137.64.31: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)[]; RCPT_COUNT_THREE(0.00)[3]; NEURAL_HAM_LONG(-1.00)[-1.000]; MIME_GOOD(-0.10)[text/plain]; SPAMHAUS_ZRD(0.00)[98.137.64.31:from:127.0.2.255]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[98.137.64.31:from]; RWL_MAILSPIKE_POSSIBLE(0.00)[98.137.64.31: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: Thu, 18 Mar 2021 21:22:10 -0000 On 2021-Mar-18, at 13:38, Diane Bruce wrote: > On Thu, Mar 18, 2021 at 11:07:36AM -0700, bob prohaska wrote: >> On Thu, Mar 18, 2021 at 05:28:27PM +0000, tech-lists wrote: >>> hi, >>> >>> On Thu, Mar 18, 2021 at 10:00:53AM -0700, bob prohaska wrote: >>> > ... >> bob prohaska >> > > I've been meaning to get someone to look this over but basically this > rejigs the mini-uart baud rate depending on the CPU clock.. > > > https://reviews.freebsd.org/D24339 I'm confused. The RPi* firmware dynamically assigns which UART used for the serial console based on other settings (including a default context). For the default, with Bluetooth in use the miniuart is used for the serial console and the PL011 for Bluetooth. (Only the miniuart has the speed variability issue.) But with either ( in config.txt ): dtoverlay=disable-bt or: dtoverlay=miniuart-bt the PL011 is used for the serial console. That last uses the miniuart for Bluetooth as well, letting it suffer the variability. Is the proposed change compatible with this? Is it compatible with Bluetooth being what is using the miniuart? (Note: I happen to use dtoverlay=disable-bt .) === Mark Millard marklmi at yahoo.com ( dsl-only.net went away in early 2018-Mar)