[Letux-kernel] Where does RTC actually work

Andreas Kemnade andreas at kemnade.info
Tue Jan 31 22:38:20 CET 2017


Hi,

I played around a bit further:
1.booting 4.7 with new uboot
setting clock
2.halt

3. doing funny things in uboot

GTA04b2 # i2c dev 0
Setting bus to 0

GTA04b2 # i2c md 0x4b 0x1c 6
001c: 17 12 21 31 01 17    ..!1..
21:12:17  31. Jan 2017 UTC

do a new clock read
GTA04b2 # i2c mw 0x4b 0x29 0x41 1
GTA04b2 # i2c md 0x4b 0x1c 6     
001c: 36 15 2d 31 01 17    6.-1..

2d:15:36 31 Jan 2017
bad hour

GTA04b2 # i2c md 0x4b 0x1c 6
001c: 36 15 2d 31 01 17    6.-1..
GTA04b2 # i2c md 0x4b 0x1c 6
001c: 36 15 2d 31 01 17    6.-1..

do a new clock read
GTA04b2 # i2c mw 0x4b 0x29 0x41 1
GTA04b2 # i2c md 0x4b 0x1c 6     
001c: 51 15 2d 31 01 17    Q.-1..

again bad hour

some minutes later
GTA04b2 # i2c mw 0x4b 0x29 0x41 1
GTA04b2 # i2c md 0x4b 0x1c 6     
001c: 27 19 2d 31 01 17    '.-1..
GTA04b2 # 

again bad hour, everything else is correct.

I accidentially booted the kernel by messing with init= in a bad way.
So no modules were loaded (twl-rtc as module)
pressed power for 10 seconds
read the clock from uboot again
clock ok except for the hour.

Regards,
Andreas
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