Not too long ago, in order to get -current to boot, a new .dtb needs to be used.
# cat config.txt # Boot options, see https://www.raspberrypi.org/documentation/configuration/config-txt/boot.md # device_tree=bcm2710-rpi-3-b-plus.dtb kernel_address=0x01000040 # # UART settings, see https://www.raspberrypi.org/documentation/configuration/uart.md #upstream_kernel=1 #uart_2ndstage=1 # enable_uart=1 force_turbo=0 dtc -I dtb -O dts bcm2710-rpi-3-b-plus.dtb does produce similar output as you mention. Nonetheless, # i2cscan iic0 i2cscan: couldn't open iic0: Device not configured same for iic1 and iic2 (by they way, why is it i2c in some cases, and iic in others?) # l -l /dev/iic* crw------- 1 root wheel 201, 0 Jun 16 2019 /dev/iic0 crw------- 1 root wheel 201, 1 Jun 16 2019 /dev/iic1 crw------- 1 root wheel 201, 2 Jun 16 2019 /dev/iic2 So, for some reason, i2cscan is not finding any i2c bus. On Wed, Feb 12, 2020 at 1:41 PM Michael van Elst <[email protected]> wrote: > [email protected] (Michael Cheponis) writes: > > -rwxr-xr-x 1 root wheel 22630 Jun 16 2019 bcm2837-rpi-3-b-plus.dtb* > > > Raspberry Pi 3 Model B Plus Rev 1.3 - so I'm not sure which of the > >highlighted dtb files is used. > > That one would have i2c enabled. You can disassemble the dtb files with > e.g. > > dtc -I dtb -O dts bcm2837-rpi-3-b-plus.dtb > > and get something including: > > i2c@7e205000 { > compatible = "brcm,bcm2835-i2c"; > reg = <0x7e205000 0x1000>; > interrupts = <0x02 0x15>; > clocks = <0x04 0x14>; > #address-cells = <0x01>; > #size-cells = <0x00>; > status = "okay"; > pinctrl-names = "default"; > pinctrl-0 = <0x0e>; > clock-frequency = <0x186a0>; > linux,phandle = <0x47>; > phandle = <0x47>; > }; > > i2c@7e804000 { > compatible = "brcm,bcm2835-i2c"; > reg = <0x7e804000 0x1000>; > interrupts = <0x02 0x15>; > clocks = <0x04 0x14>; > #address-cells = <0x01>; > #size-cells = <0x00>; > status = "okay"; > pinctrl-names = "default"; > pinctrl-0 = <0x16>; > clock-frequency = <0x186a0>; > linux,phandle = <0x4f>; > phandle = <0x4f>; > }; > > i2c@7e805000 { > compatible = "brcm,bcm2835-i2c"; > reg = <0x7e805000 0x1000>; > interrupts = <0x02 0x15>; > clocks = <0x04 0x14>; > #address-cells = <0x01>; > #size-cells = <0x00>; > status = "okay"; > linux,phandle = <0x17>; > phandle = <0x17>; > }; > > -- > -- > Michael van Elst > Internet: [email protected] > "A potential Snark may lurk in every tree." >
