Date: Fri, 24 Mar 2017 16:09:47 -0500 From: Karl Denninger <karl@denninger.net> Cc: "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: i2c on Pi3? Message-ID: <1b44d729-eb76-782f-ba8b-d727e18dfd5a@denninger.net> In-Reply-To: <20170324194431.GA66320@bluezbox.com> References: <0b83d41a-1a9e-28cc-6ecd-03e6a63a06a2@denninger.net> <DAC58CC9-9D1C-483F-B748-3BD20A8245CE@thehowies.com> <f1c3c4bb-976c-05ba-24ec-212bc9412a33@denninger.net> <20170323175342.GA55627@bluezbox.com> <843bbe39-0b74-0d27-598d-ae16aea52a37@denninger.net> <20170324185652.GA65910@bluezbox.com> <e2a42066-c2f8-107d-b436-185c8a197ede@denninger.net> <20170324194431.GA66320@bluezbox.com>
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This is a cryptographically signed message in MIME format. --------------ms060501060006090109080803 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable On 3/24/2017 14:44, Oleksandr Tymoshenko wrote: > Karl Denninger (karl@denninger.net) wrote: >> On 3/24/2017 13:56, Oleksandr Tymoshenko wrote: >>> Karl Denninger (karl@denninger.net) wrote: >>>> On 3/23/2017 12:53, Oleksandr Tymoshenko wrote: >>>>> Karl Denninger (karl@denninger.net) wrote: >>>>>> On 3/23/2017 12:34, John Howie wrote: >>>>>> >>>>>>> Hi Karl, >>>>>>> >>>>>>> I can only speak to the Raspberry Pi 2 kernel, but I2C is support= ed. For an example how to use it from userland, check out a project I pos= ted on github eighteen months ago, that was for the PiFace RTC. >>>>>>> >>>>>>> https://github.com/jhowie/FreeBSDPiFaceRTC >>>>>>> >>>>>>> There are useful routines I created for working with devices on t= he I2C bus, which you are free to use. They are not RPI2-specific, so the= y should work on other boards.=20 >>>>> .. skipped .. >>>>>> It works on the Pi2; I am using it in production. >>>>>> >>>>>> The driver appears to be /missing /in the Pi3 kernel. >>>>> Probably it's not enabled in DTB. Try adding this line to config.tx= t: >>>>> >>>>> dtparam=3Di2c_arm=3Don,spi=3Don >>>>> >>>> Nope, already in the base config.txt file: >>>> >>>> arm_control=3D0x200 >>>> dtparam=3Daudio=3Don,i2c_arm=3Don,spi=3Don >>>> dtoverlay=3Dmmc >>>> dtoverlay=3Dpi3-disable-bt >>>> device_tree_address=3D0x4000 >>>> kernel=3Du-boot.bin >>> I just built latest HEAD, i2c driver is available in GENERIC kernel: >>> # dmesg | grep iic >>> iichb0: <BCM2708/2835 BSC controller> mem 0x7e804000-0x7e804fff irq 3= 1 >>> on simplebus0 >>> iicbus0: <OFW I2C bus> on iichb0 >>> random: harvesting attach, 8 bytes (4 bits) from iicbus0 >>> random: harvesting attach, 8 bytes (4 bits) from iichb0 >>> >>> The driver itself is sys/arm/broadcom/bcm2835/bcm2835_bsc.c >>> >>> Could you run this command on your Pi3 and send output? Thanks >>> >>> sysctl -b hw.fdt.dtb | dtc -I dtb | grep -A 13 'i2c@.*{' >>> >> I have a copy of Generic with a couple of tweaks in it; I DO NOT get t= he >> iic identifiers. >> >> Here's what I have in the dtb; I will svn update and rebuild with >> GENERIC (don't see why the tweaks would change anything, but will try >> with GENERIC anyway and see if anything changes. > Looks like DTB in your firmware is different from what I have (my is > relatively old). Try applying this patch to your kernel: > > https://people.freebsd.org/~gonzo/arm/patches/rpi3-bcm2835-i2c.diff > OK, that fixed it with "device iic" added to the kernel config (which is NOT in GENERIC) Can we get that one-liner committed in -HEAD and "device iic" added to GENERIC? (There's no particular reason for it not to be there I don't think.... without it the device nodes do not get set up and while the device might be recognized getting to it is a bit of a problem!) --=20 Karl Denninger karl@denninger.net <mailto:karl@denninger.net> /The Market Ticker/ /[S/MIME encrypted email preferred]/ --------------ms060501060006090109080803 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 BlwwggZYMIIEQKADAgECAgE9MA0GCSqGSIb3DQEBCwUAMIGQMQswCQYDVQQGEwJVUzEQMA4G A1UECBMHRmxvcmlkYTESMBAGA1UEBxMJTmljZXZpbGxlMRkwFwYDVQQKExBDdWRhIFN5c3Rl bXMgTExDMRwwGgYDVQQDExNDdWRhIFN5c3RlbXMgTExDIENBMSIwIAYJKoZIhvcNAQkBFhND dWRhIFN5c3RlbXMgTExDIENBMB4XDTE2MTIxODE5NDUzNVoXDTIxMTIxNzE5NDUzNVowVzEL MAkGA1UEBhMCVVMxEDAOBgNVBAgTB0Zsb3JpZGExGTAXBgNVBAoTEEN1ZGEgU3lzdGVtcyBM TEMxGzAZBgNVBAMUEmthcmxAZGVubmluZ2VyLm5ldDCCAiIwDQYJKoZIhvcNAQEBBQADggIP ADCCAgoCggIBAM2N5maxs7NkoY9g5NMxFWll0TYiO7gXrGZTo3q25ZJgNdPMwrntLz/5ewE9 07TEbwJ3ah/Ep9BfZm7JF9vTtE1HkgKtXNKi0pawNGm1Yn26Dz5AbUr1byby6dFtDJr14E07 trzDCtRRvTkOVSBj6PQPal0fAnDtkIYQBVcuMkXkuMCtyfE95pjm8g4K9l7lAcKii3T1/3rE hCc1o2nBnb7EN1/XwBeCDGB+I2SN/ftZDbKQqGAF5q9dUn+iXU7Z/CVSfUWmhVh6cVZA4Ftv TglUqj410OuPx+cUQch3h1kFgsuhQR63HiJc3HbRJllHsV0rihvL1CjeARQkhnA6uY9NLFST p5I/PfzBzW2MSmtN/tGZvmfKKnmtbfUNgkzbIR1K3lsum+yEL71kB93Xtz/4f1demEx5c8TJ RBIniDHjDeLGK1aoBu8nfnvXAvgthFNTWBOEoR49AHEPjC3kZj0l8JQml1Y8bTQD5gtC5txl klO60WV0EufU7Hy9CmynMuFtjiA2v71pm097rXeCdrAKgisdYeEESB+SFrlY65rLiLv4n8o1 PX7DqRfqKkOYIakZ0ug/yHVKcq2EM3RiJxwzls5gT70CoOBlKbrC98O8TA6teON0Jq30M06t NTI2HhvNbJDLbBH+Awf4h1UKB+0ufENwjVvF5Jfz8Ww/FaSDAgMBAAGjgfQwgfEwNwYIKwYB BQUHAQEEKzApMCcGCCsGAQUFBzABhhtodHRwOi8vY3VkYXN5c3RlbXMubmV0Ojg4ODgwCQYD VR0TBAIwADARBglghkgBhvhCAQEEBAMCBaAwCwYDVR0PBAQDAgXgMCwGCWCGSAGG+EIBDQQf Fh1PcGVuU1NMIEdlbmVyYXRlZCBDZXJ0aWZpY2F0ZTAdBgNVHQ4EFgQUpfAI3y+751pp9A0w 6vJHx8RoR/MwHwYDVR0jBBgwFoAUJHGbnYV9/N3dvbDKkpQDofrTbTUwHQYDVR0RBBYwFIES a2FybEBkZW5uaW5nZXIubmV0MA0GCSqGSIb3DQEBCwUAA4ICAQBiB6MlugxYJdccD8boZ/u8 d8VxmLkJCtbfyYHRjYdyoABLW5hE3k3xSpYCM9L7vzWyV/UWwDYKi4ZzxHo4g+jG/GQZfKhx v38BQjL2G9xD0Hn2d+cygOq3UPjVYlbbfQoew6JbyCFXrrZ7/0jvRMLAN2+bRC7ynaFUixPH Whnj9JSH7ieYdzak8KN+G2coIC2t2iyfXVKehzi5gdNQ0vJ7+ypbGsRm4gE8Mdo9N/WgFPvZ HPFqR9Dwas7Z+aHwOabpk5r/336SyjOaZsn3MqKJQZL6GqDKusVOCWt+9uFAD8kadg7FetZe atIoD9I+zbp59oVoMnkMDMx7Hi85faU03csusqMGsjSsAzWSI1N8PJytZlchLiykokLKc3OL G87QKlErotlou7cfPX2BbEAH5wmkj9oiqZhxIL/wwAUA+PkiTbEmksKBNompSjUq/6UsR8EA s74gnu17lmijv8mrg2qMlwRirE7qG8pnE8egLtCDxcjd0Of9WMi2NJskn0/ovC7P+J60Napl m3ZIgPJst1piYSE0Zc1FIat4fFphMfK5v4iLblo1tFSlkdx1UNDGdg/U+LaXkNVXlMp8fyPm R80V6cIrCAlEWnBJNxG1UyfbbsvNMCCZBM4faGGsR/hhQOiydlruxhjL6P8J2WV8p11DdeGx KymWoil2s1J5WTGCBRMwggUPAgEBMIGWMIGQMQswCQYDVQQGEwJVUzEQMA4GA1UECBMHRmxv cmlkYTESMBAGA1UEBxMJTmljZXZpbGxlMRkwFwYDVQQKExBDdWRhIFN5c3RlbXMgTExDMRww GgYDVQQDExNDdWRhIFN5c3RlbXMgTExDIENBMSIwIAYJKoZIhvcNAQkBFhNDdWRhIFN5c3Rl bXMgTExDIENBAgE9MA0GCWCGSAFlAwQCAwUAoIICTTAYBgkqhkiG9w0BCQMxCwYJKoZIhvcN AQcBMBwGCSqGSIb3DQEJBTEPFw0xNzAzMjQyMTA5NDdaME8GCSqGSIb3DQEJBDFCBEBAdpd4 PZvCSOVwsxzP/LSGNzFV4Tw7U4+qj44H6aWfct6FrNquAqWazeqjLQxux8rT0XUw5pwRDC6B X1e6TMtiMGwGCSqGSIb3DQEJDzFfMF0wCwYJYIZIAWUDBAEqMAsGCWCGSAFlAwQBAjAKBggq hkiG9w0DBzAOBggqhkiG9w0DAgICAIAwDQYIKoZIhvcNAwICAUAwBwYFKw4DAgcwDQYIKoZI hvcNAwICASgwgacGCSsGAQQBgjcQBDGBmTCBljCBkDELMAkGA1UEBhMCVVMxEDAOBgNVBAgT B0Zsb3JpZGExEjAQBgNVBAcTCU5pY2V2aWxsZTEZMBcGA1UEChMQQ3VkYSBTeXN0ZW1zIExM QzEcMBoGA1UEAxMTQ3VkYSBTeXN0ZW1zIExMQyBDQTEiMCAGCSqGSIb3DQEJARYTQ3VkYSBT eXN0ZW1zIExMQyBDQQIBPTCBqQYLKoZIhvcNAQkQAgsxgZmggZYwgZAxCzAJBgNVBAYTAlVT MRAwDgYDVQQIEwdGbG9yaWRhMRIwEAYDVQQHEwlOaWNldmlsbGUxGTAXBgNVBAoTEEN1ZGEg U3lzdGVtcyBMTEMxHDAaBgNVBAMTE0N1ZGEgU3lzdGVtcyBMTEMgQ0ExIjAgBgkqhkiG9w0B CQEWE0N1ZGEgU3lzdGVtcyBMTEMgQ0ECAT0wDQYJKoZIhvcNAQEBBQAEggIAfcs5r3MS2Ak6 RZJ96JRGoaJOu42ozUU/LPHFGX+JsmU1zEnHafnj2bZXovfXCqWYRldEXpodNg1ViUCBzTfE aFeU0AvAltNUiIGyMp5OIubZ1SB5fOkYisFActT5uUfly2mLBVAWAilhEz5YLvT9gJljy+DL 4+cPdoq17AvI8rHURARSUMTV67ICfXuudwy21iaPDTPImQvHcwu9ogfDLGPpLbY13XdXeHRB DhBMlOjUpBCGZpR0vHIh472ptC3I/UNhngh4aTAODk2qG2RfZUqT7UN0V+syoR3HNSou0x4T VNFz35MjSTtPOol0WmeS29zVyFG3eTzQD7M7LGKWPYzIQ0Rr2Tmkshn7pforwv94b7XNc1qQ k0PrgfoaFRa6GK4bdkMrATq/gRlwDUsrFyJp+r35bhxyrV6CWXsVPOqiBnsOYvBQcG9aRw0N HSFR8c8mkDI4JHTYdK3eeAXJ7d542wmfKupCSik18AbvrozrwwfBOnW4wITZ5FUdQDBVQMF0 AdSOVNzkHuFwDsFqCd4rNNEJqhV11VE8okVCgm/kA3eRVoo/x/HoR0IJggfWuGHUYUtpr2wa YK6TaUpUOZ2m3LrYCvTl288Fu/gR02hM+T2u/nakRdNl58QHdii8tqLP3G5OrsaRYD1FBwjm N0cQJX7brek4zTIHTGQCQmUAAAAAAAA= --------------ms060501060006090109080803--
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