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ID | Project | Category | View Status | Date Submitted | Last Update | ||||
0000108 | Bananian Linux | [All Projects] Kernel | public | 2015-02-24 18:51 | 2015-12-25 14:43 | ||||
Reporter | brandonburg | ||||||||
Assigned To | Nico | ||||||||
Priority | normal | Severity | feature | Reproducibility | always | ||||
Status | resolved | Resolution | fixed | ||||||
Product Version | 15.01 | ||||||||
Target Version | Fixed in Version | ||||||||
Summary | 0000108: Kernel module rtc-ds1307 for the extremely accurate DS3231 RTC chip is missing | ||||||||
Description | The kernel module "rtc-ds1307" is missing. This driver is necessary for the extremely accurate I2C-integrated DS3231 RTC chip. This chip provides an accurate time source for systems that are not connected to the internet. Most RTC chips are not that accurate and provide no reliable time source. It should also be mentioned that NTP is no longer secure and its usage implies security issues (see http://www.golem.de/news/openbsd-sichere-uhrzeit-mit-ntp-und-https-1502-112370.html [^] [German language]). The DS3231 can be used as an alternative solution. Another good reason for the "rtc-ds1307" kernel module: The support of RTC modules helps to preserve the Banana Pi product warranty. It is not neccesary to solder a battery on the PCB. Some users have no soldering equipment. DS3231 Accuracy ±2ppm from 0°C to +40°C Accuracy ±3.5ppm from -40°C to +85°C [ppm - parts per million] Very tiny plug-in modules are already available for the Raspberry Pi. These modules can also be used on the Banana Pi on CON3 header (pins 1, 3, 5, 7): http://forum.lemaker.org/thread-4276-1-1-my_humble_experience_with_rtc_and_bananapi.html [^] | ||||||||
Steps To Reproduce | /sbin/modprobe rtc-ds1307 | ||||||||
Additional Information | Hint: It is possible to bend up the supercapacitor/battery on most DS3231 RTC modules, so that the supercapacitor/battery does not collide with pins on J12 header on the Banana Pi. Alternatively, insulating tape may also help to keep the supercapacitor/battery on the module away from the J12 pin header. Functional check of DS3231 RTC module after module insertion without kernel driver: /usr/bin/watch -n 0,4 "i2cget -y 2 0x68 0; i2cget -y 2 0x68 1; i2cget -y 2 0x68 2" (requires: apt-get install i2c-tools ) DS3231 data sheet: http://datasheets.maxim-ic.com/en/ds/DS3231.pdf [^] | ||||||||
Tags | DS1307, DS3231, kernel, NTP, RTC | ||||||||
Attached Files | |||||||||
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(0000288) sinuswave (reporter) 2015-10-05 19:57 |
The upstream kernel package 4,2 has ds1307 module supprt. |
(0000318) Nico (manager) 2015-12-25 14:43 |
Please use our mainline 4.x kernel packages. |
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Date Modified | Username | Field | Change |
2015-02-24 18:51 | brandonburg | New Issue | |
2015-02-24 18:58 | brandonburg | Tag Attached: DS1307 | |
2015-02-24 18:58 | brandonburg | Tag Attached: DS3231 | |
2015-02-24 18:58 | brandonburg | Tag Attached: kernel | |
2015-02-24 18:58 | brandonburg | Tag Attached: NTP | |
2015-02-24 18:58 | brandonburg | Tag Attached: RTC | |
2015-10-05 19:57 | sinuswave | Note Added: 0000288 | |
2015-12-25 14:43 | Nico | Note Added: 0000318 | |
2015-12-25 14:43 | Nico | Status | new => resolved |
2015-12-25 14:43 | Nico | Resolution | open => fixed |
2015-12-25 14:43 | Nico | Assigned To | => Nico |
2015-12-25 14:44 | Nico | Relationship added | has duplicate 0000139 |
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