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+--- Thread: Arch Linux Arm - external RTC problem (/showthread.php?tid=11031)
Arch Linux Arm - external RTC problem - max - 08-13-2020
I have connected an external RTC module (ds3231) to a Rock 64/4g.
I've loaded i2c-dev modules and rtc-ds1307 modules but my rtc mod is not detected by i2c (i2cdetect shows nothing connected at address 68)
Hardware is ok (if I boot with ayurfan distro I can see the external RTC module).
Could it be a kernel configuration problem? Has anyone had similar experience?
My Linux distro is Arch Linux Arm.
Regards
Max
RE: Arch Linux Arm - external RTC problem - max - 08-17-2020
if anyone would be interested I managed to make it all work.
- i've modified, recompiled and overwrite to original one (in /boot/dtb) rk3328-rock64.dts, adding this fragment of code
Code:
&i2c0 {
status = "okay";
ds1307: ds1307@68 {
compatible = "maxim,ds1307";
reg = <0x68>;
status = "okay";
};
ds3231: ds3231@68 {
compatible = "maxim,ds3231";
reg = <0x68>;
status = "okay";
};
};to enable i2c0 bus and to let automatically discovered the rtc device by the kernel at boot time.
- blacklisted rock64 rtc module (rtc_rk808)
- added rtc_ds1307 module to automatic module loading system
After reboot rtc device will be created and the rtc module enabled