Ok, I've updated and installed overlays again. No more errors in dmesg
while read/write to RTC1, only init messages:
[ 4.293079] rtc-ds1307 1-0068: SET TIME!
[ 4.295910] rtc-ds1307 1-0068: rtc core: registered mcp7940x as rtc1
[ 4.295938] rtc-ds1307 1-0068: 64 bytes nvram
but RTC1 is not accessible:
root@beaglebone:/lib/firmware# date
Thu Nov 9 10:34:42 CET 2017
root@beaglebone:/lib/firmware# hwclock --rtc=/dev/rtc1
hwclock: Timed out waiting for time change.
hwclock: The Hardware Clock registers contain values that are either
invalid (e.g. 50th day of month) or beyond the range we can handle (e.g.
Year 2095).
root@beaglebone:/lib/firmware# hwclock --rtc=/dev/rtc1 --systohc
hwclock: Timed out waiting for time change.
Can't read or set valid time.
my boot/uEnv.txt file contains:
uname_r=4.4.96-bone20
cmdline=coherent_pool=1M quiet init=/lib/systemd/systemd
dtb=am335x-boneblack-emmc-overlay.dtb
cape_enable=bone_capemgr.enable_partno=BB-RTC-01,BB-UART1,BB-UART2,BB-UART4,BB-UART5
When old kernel 4.4.39-bone15 is used rtc is registered as below and is
working fine:
[ 1.186751] rtc-ds1307 1-0068: SET TIME!
[ 1.189263] rtc-ds1307 1-0068: rtc core: registered ds1338 as rtc1
[ 1.189293] rtc-ds1307 1-0068: 56 bytes nvram
but after update and install overlays I got same error:
hwclock: The Hardware Clock registers contain values that are either
invalid (e.g. 50th day of month) or beyond the range we can handle (e.g.
Year 2095).
So, I've change file src/arm/BB-RTC-01-00A0.dts section:
mcp7940x@68 {
compatible = "microchip,mcp7940x";
reg = <0x68>;
};
to compatible value from old version:
compatible = "maxim,ds1338";
After this and update/install/reboot, rtc1 is working again! :)
Next step is to check if it will be working with newest kernel aswell. It
works!
The question is, why compatible "maxim,ds1338" was changed to
"microchip,mcp7940x"?
Why aliases (rtc1 = "/ocp/rtc@44e3e000") are not equal to kernel values:
omap_rtc
44e3e000.rtc: rtc core: registered 44e3e000.rtc as rtc0? But this maybe
doesn't matter.
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