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This is the screen when I connect a new beaglebone green with an rtc. If I burn the latest image, the beaglebone does not detect the rtc. El jueves, 22 de marzo de 2018, 23:38:03 (UTC+1), Jeff Andich escribió: > > I'm working with the RTC (MCP794110) at the moment, but on a "BB-X15 - > like" custom board platform. > > I'm not sure I follow. your post.. What's the I2C tool? Are you talking > about attaching the RTC to the BBB via the I2C tool or a problem with > reading the RTC on the BBB? Pardon my ignorance but does the BBB come with > an RTC (e.g. MCP794110) installed? The BB-X15 does.. > > Did you enable the I2C bus the RTC is attached to in the dev. tree? On my > platform, I had to enable the I2C bus (I2C3) in the dev. tree before the > drivers for the RTC would load. > > Then with some "new" RTC's on some of my boards, but not all, I got > "unable to read the hardware clock, I think, when the kernel is attempting > to set the system clock from the hardware clock (see the following): > > ebian@BeagleBoard-X15:~$ dmesg|grep rtc > [ 1.551522] rtc-ds1307 2-006f: rtc core: registered mcp7941x as rtc0 > [ 1.551652] rtc-ds1307 2-006f: 64 bytes nvram > [ 1.554511] omap_rtc 48838000.rtc: rtc core: registered 48838000.rtc as > rtc2 > [ 1.558261] palmas-rtc 48070000.i2c:tps659038@58:tps659038_rtc: rtc > core: registered 48070000.i2c:tps659 as rtc1 > [ 1.997160] rtc-ds1307 2-006f: hctosys: unable to read the hardware > clock. > > From what I've read on posts involving the RTC the following messages: > > 1) "unable to read the hardware clock" message and the > 2) hwclock: ioctl(RTC_RD_TIME) to /dev/rtc to read the time failed: > Invalid argument. > > are due to the RTC's time being not initialized or (?invalid?). I've been > able to work-around this by setting the clock, but initially I get warning > #2 when I initialize the clock with a valid date/time. I'm wondering if > anyone can confirm if this is the correct fix for this scenario... > > Also, when PTC builds the BB-X15, and the BBB manufacture builds the > BBB's (assuming BBB's have a RTC installed), do they ensure that the RTC > is correctly initialized prior to shipping to the distributors ? > > > On Wednesday, March 21, 2018 at 6:18:27 PM UTC-5, Graham wrote: >> >> Do you have pull-up resistors? >> >> --- Graham >> >> == >> >> >> On Monday, March 19, 2018 at 8:28:51 AM UTC-5, Paco Velasco wrote: >>> >>> When I connect the rtc it does not detect the 68 address (I2C Tool). >>> >>> I have test with 2 RTC diferent,and with the BBB I have no problem. >>> >>> Anybody knows what could be the problem? Thanks >>> >>> -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/ff602e0b-c6f4-4c14-b7eb-071dde50b187%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
