Date: Wed, 28 Apr 2021 09:01:56 +0100 From: Mark Murray <markm@FreeBSD.org> To: Mark Millard <marklmi@yahoo.com> Cc: freebsd-arm <freebsd-arm@freebsd.org> Subject: Re: I2C/IIC working on RPI4 8GB? Message-ID: <47A634E3-4938-4AFC-9341-E480CEBF67FB@FreeBSD.org> In-Reply-To: <C4828BF2-E8B7-45D1-B0F8-5E72AF84D565@yahoo.com> References: <1C2DD11C-B1F6-4C2A-9AB0-5F1553520FF5@FreeBSD.org> <20210426161138.a8f44b6e1134f73a411be57d@bidouilliste.com> <CF4C4332-BB2F-47E9-B879-8EEA0E53E848@FreeBSD.org> <C4828BF2-E8B7-45D1-B0F8-5E72AF84D565@yahoo.com>
next in thread | previous in thread | raw e-mail | index | archive | help
--Apple-Mail=_EAC516F5-CFA7-41D5-8574-4FFD2E7B798F Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii On 27 Apr 2021, at 21:13, Mark Millard <marklmi@yahoo.com> wrote: >=20 > Did you try the suggestion in: >=20 > https://lists.freebsd.org/pipermail/freebsd-arm/2021-April/023687.html >=20 > ? It suggests that you need to have the config.txt swap > the the pins in order to undo another swap that happens > at some internal stage. The swapped problem was indicated > to be visible in the dmesg reporting and the manual swap > was reported to cause the dmesg reporting to produce the > correct overall result. I took apart the i2c1.dtbo overlay that mentions pins 2, 3, and swapped = them, and reassembled the overlay. Nope. Same problem. What I have: [root@grasshopper ~]# dmesg | egrep -i 'ds3231|rtc|i2c|iic|time-of-day' iichb0: <BCM2708/2835 BSC controller> mem 0x7e804000-0x7e804fff irq 26 = on simplebus0 iicbus0: <OFW I2C bus> on iichb0 iic0: <I2C generic I/O> on iicbus0 Warning: no time-of-day clock registered, system time will not be set = accurately [root@grasshopper ~]# ls -al /dev | grep iic crw------- 1 root wheel 0x44 Apr 28 08:42 iic0 I have found a PDF document "BCM2711 ARM Peripherals", and it says "The = BSC controller in the BCM2711 fixes the clock-strectching[sic] bug that = was present in BCM283x devices", so I suspect that the device may not be = hardware compatible with the RPI3 and earlier. Time to dig in and hack. M -- Mark R V Murray --Apple-Mail=_EAC516F5-CFA7-41D5-8574-4FFD2E7B798F Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.2 Comment: GPGTools - http://gpgtools.org iQEzBAEBCgAdFiEEyzPHvybPbOpU9MCxQlsJDh9CUqAFAmCJFnQACgkQQlsJDh9C UqAhNgf+NpEZ0WCJM0aaYSSMmFVXwGGNHZtx+RhU1FkJsGSyqetEHpOKMoOa3ZgQ yTJgnPgInh/Li18XLUe7DBEnGtTd6CoIRfbWyp1IlANfJFXybEtBqE2PMlOJ8ekd DcOICA4yx1glm81LkASoQecRGj9xRYZTcOZ0gzCE6Zltr1LcROoIQgIhDW1c7oMj Y3yQu67ixh2KSFU0ZsHBrDZ4gZM13poxRpF39V4aPQyqyDIQgJV8x8nzDbNrpwy+ R8WCd9PyZp1UYpBTmkOQ3o/6bJvQCWj9SjbcXq08HwOcI4bnD4qpHQjBMhdR2F4C rXfIMD8mxwL7oZBp3oGnJVEqce4Z3Q== =RXYl -----END PGP SIGNATURE----- --Apple-Mail=_EAC516F5-CFA7-41D5-8574-4FFD2E7B798F--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?47A634E3-4938-4AFC-9341-E480CEBF67FB>