Vladas

Solved: i2c1 address 0x50 through 0x57 are used by onboard EEPROM connected to PB18, PB19 root@lime2:~# cat /sys/bus/i2c/devices/1-0050/modalias i2c:24c16 root@lime2:~# grep 24c16 /lib/modules/4.14.65-sunxi/modules.alias alias i2c:24c16 at24 root@lime2:~# rmmod at24 root@lime2:~# i2cdetect -y 1 0 1 2 3 4 5 6 7 8 9 a b c d e f 50: 50 51 52 53 54 55 56 57 -- -- -- -- -- -- -- --

Good day, I use prebuild Armbian Stretch mainline kernel 4.14.y. And I want to connect pcf8563 rtc through i2c protocol on TWI1_SCK/PB18, TWI1_SDA/PB19 hw A20 pins. pcf8563 slave address is 0x51. If by default, no i2c are enabled through overlays= in armbianEnv.txt, I still get i2c-1 device with addresses 0x51-0x57 occupied: root@lime2:~# ls /dev | grep i2c i2c-0 i2c-1 root@lime2:~# i2cdetect -y 0 0 1 2 3 4 5 6 7 8 9 a b c d e f 30: -- -- -- -- UU -- -- -- -- -- -- -- -- -- -- -- root@lime2:~# i2cdetect -y 1 0 1 2 3 4 5 6 7 8 9 a b c d e f 50: UU UU UU UU UU UU UU UU -- -- -- -- -- -- -- -- If I enable i2c1 through overlays=i2c1 in armbianEnv.txt, i2c-0 disappears from /dev/ and axp209 is now mapped on i2c-2: root@lime2:~# ls /dev | grep i2c i2c-1 i2c-2 root@lime2:~# i2cdetect -y 1 0 1 2 3 4 5 6 7 8 9 a b c d e f 50: UU UU UU UU UU UU UU UU -- -- -- -- -- -- -- -- root@lime2:~# i2cdetect -y 2 0 1 2 3 4 5 6 7 8 9 a b c d e f 30: -- -- -- -- UU -- -- -- -- -- -- -- -- -- -- -- Please advice, how to free up slave address 0x51 on i2c1? Additional info with i2c1 enabled: root@lime2:/# ls /sys/bus/i2c/devices/ 1-0050 1-0051 1-0052 1-0053 1-0054 1-0055 1-0056 1-0057 2-0034 i2c-1 i2c-2 root@lime2:/# cat /sys/bus/i2c/devices/1-0051/modalias i2c:dummy root@lime2:/# grep dummy /lib/modules/4.14.65-sunxi/modules.alias alias rtnl-link-dummy dummy root@lime2:/# rmmod rtnl-link-dummy rmmod: ERROR: Module rtnl_link_dummy is not currently loaded root@lime2:/# dmesg | grep dummy [ 1.063542] ldo1: supplied by regulator-dummy [ 1.063827] ldo2: supplied by regulator-dummy [ 1.064960] ldo3: supplied by regulator-dummy [ 1.065662] ldo4: supplied by regulator-dummy [ 1.065854] ldo5: supplied by regulator-dummy [ 1.066504] dcdc2: supplied by regulator-dummy [ 1.067189] dcdc3: supplied by regulator-dummy [ 1.398296] usb_phy_generic usb_phy_generic.0.auto: usb_phy_generic.0.auto supply vcc not found, using dummy regulator