Date: Mon, 25 Mar 2019 12:18:37 -0500 From: Karl Denninger <karl@denninger.net> To: ticso@cicely.de, Ian Lepore <ian@freebsd.org> Cc: "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: Options for FBSD support with LCD device - new project [[Maybe related: I2c issues on the Pi2]] Message-ID: <d19e42a8-eff5-a111-0bf4-8d4f802f95ba@denninger.net> In-Reply-To: <20190325170948.GN57400@cicely7.cicely.de> References: <CE40E2B5-2244-4EF9-B67F-34A54D71E2E8@jeditekunum.com> <f60ea6d2-b696-d896-7bcb-ac628f41f7b8@denninger.net> <20190319161423.GH57400@cicely7.cicely.de> <52df098fdc0caf5de1879c93239534fffbd49b56.camel@freebsd.org> <40f57de2-2b25-3981-a416-b9958cc97636@denninger.net> <669892ac3fc37b0843a156c0ab102316829103fd.camel@freebsd.org> <663f2566-b035-7011-70eb-4163b41e6e55@denninger.net> <20190325164827.GL57400@cicely7.cicely.de> <fc694564b1cf8bfa781ff86a7d5d7d09de68ad0e.camel@freebsd.org> <20190325170534.GM57400@cicely7.cicely.de> <20190325170948.GN57400@cicely7.cicely.de>
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This is a cryptographically signed message in MIME format. --------------ms060601070303020901060003 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 3/25/2019 12:09, Bernd Walter wrote: > On Mon, Mar 25, 2019 at 06:05:35PM +0100, Bernd Walter wrote: >> On Mon, Mar 25, 2019 at 10:52:26AM -0600, Ian Lepore wrote: >>> On Mon, 2019-03-25 at 17:48 +0100, Bernd Walter wrote: >>>> On Mon, Mar 25, 2019 at 11:33:32AM -0500, Karl Denninger wrote: >>>>>> What do you mean by an insane rate? It's normal for the usb >>>>>> controller >>>>>> to be showing around thousands of int/sec. Despite what seems >>>>>> like a >>>>>> high rate, even on an on rpi-b it uses under 2% cpu to service >>>>>> that. >>>>>> >>>>>> root@rpi:~ # vmstat -i >>>>>> interrupt total rate >>>>>> intc0,2: vchiq0 2 0 >>>>>> intc0,11: systimer0 10103206 1110 >>>>>> intc0,17:-x_dwcotg0 218596055 24007 >>>>>> intc0,28: bcm_dma0 834 0 >>>>>> intc0,61: iichb0 5778 1 >>>>>> intc0,65: uart0 1817 0 >>>>>> intc0,70:-dhci_bcm0 172 0 >>>>>> Total 228707864 25118 >>>>>> >>>>>> -- Ian >>>>> The story gets more odd. >>>>> >>>>> The same *physical* unit that I saw this on last night with no I2c >>>>> device connected I restarted this morning -- changing NOTHING -- >>>>> and it >>>>> disappeared. >>>>> >>>>> But -- on another unit it's still there (I haven't shut down, >>>>> pulled >>>>> power and restarted that one.) >>>>> >>>>> vmstat -i on both doesn't show anything all that odd: >>>>> misbehaving that's not there, and neither are the missed interrupt >>>>> complaints. >>>>> >>>>> But again, last night the one that this morning is NOT misbehaving >>>>> WAS, >>>>> and was showing the exact same thing. >>>>> >>>>> So this looks like something that is not being initialized property= >>>>> at >>>>> boot time, and sometimes however it comes up causes trouble, and >>>>> other >>>>> times it does not -- which is likely to make it a "lot" of fun to >>>>> find. >>>> By causing trouble - do you mean it doesn't work? >>>> I noticed that my system has this message: >>>> nxprtc0: RTC clock not running >>>> Warning: bad time from time-of-day clock, system time will not be se= t >>>> accurately >>>> This shouldn't happen, but I wonder if the iic communication works a= t >>>> all. >>>> I likely wouldn't notice if the rtc failed. >>>> Maybe there was an initial problem at start as you said. >>>> Will reboot it and see what happens. >>>> After a reboot the message about the rtc is gone. >>>> Have to wait at least a day to see if the Spurious are gone too. >>>> >>> That's not a symptom of i2c comms failure, it's a symptom of a dead r= tc >>> battery. The driver has to communicate with the rtc chip to determin= e >>> that the oscillator was stopped. After a reboot all is well, because= >>> the rtc oscillator gets started when the time is written to the chip,= >>> and it keeps running through a reboot and only stops on a power cycle= =2E >> Agreed, but there is a story behind. >> The board had a design flaw in that it drained the battery over the >> pullups into the Pi when the Pi was powered down. >> I fixed that circuit and did power down tests as well. >> Don't know if the previous boot was after power down, but it is >> unlikely that the battery is dead again and if it was a power down the= n >> it was a rather short one. >> It is not a test system, I run it 24/7 as a local ntp server since abo= ut >> only 1-2 months. > Well - lets reveal another point. > I have removed the pull ups completely, in the assumption that the Pi i= tself > has propper pull ups for at least short wiring. > It did work, so I left it that way. > So it could indeed be transfer errors by inadequate pull ups causing it= =2E Not in my case - the board that was doing it, I power-cycled it and it disappeared has NOTHING on any of the header/GPIO pins except for the three wires connected to the USB/Serial interface for the console. --=20 Karl Denninger karl@denninger.net <mailto:karl@denninger.net> /The Market Ticker/ /[S/MIME encrypted email preferred]/ --------------ms060601070303020901060003 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgMFADCABgkqhkiG9w0BBwEAAKCC DdgwggagMIIEiKADAgECAhMA5EiKghDOXrvfxYxjITXYDdhIMA0GCSqGSIb3DQEBCwUAMIGL MQswCQYDVQQGEwJVUzEQMA4GA1UECAwHRmxvcmlkYTESMBAGA1UEBwwJTmljZXZpbGxlMRkw FwYDVQQKDBBDdWRhIFN5c3RlbXMgTExDMRgwFgYDVQQLDA9DdWRhIFN5c3RlbXMgQ0ExITAf BgNVBAMMGEN1ZGEgU3lzdGVtcyBMTEMgMjAxNyBDQTAeFw0xNzA4MTcxNjQyMTdaFw0yNzA4 MTUxNjQyMTdaMHsxCzAJBgNVBAYTAlVTMRAwDgYDVQQIDAdGbG9yaWRhMRkwFwYDVQQKDBBD 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