Nathanael Spriet

Hi ! We finnaly find how to manage this. I tried to boot with sun5i-a10s-olinuxino-micro.dtb in place of sun4i-a10-olinuxion-lime.dtb , because uart2 was defined in that file, but that doesn't work. So I picked those part in sun5i : uart2@0 { allwinner,pins = "PC18", "PC19"; allwinner,function = "uart2"; allwinner,drive = <0x0>; allwinner,pull = <0x0>; linux,phandle = <0x24>; phandle = <0x24>; }; ... serial@01c28800 { compatible = "snps,dw-apb-uart"; reg = <0x1c28800 0x400>; interrupts = <0x3>; reg-shift = <0x2>; reg-io-width = <0x4>; clocks = <0x22 0x12>; status = "okay"; pinctrl-names = "default"; pinctrl-0 = <0x24>; }; and put it in sun4i with the correct modifications to match with the other definitions : uart2@0 { allwinner,pins = "PI18", "PI19"; allwinner,function = "uart2"; allwinner,drive = <0x0>; allwinner,pull = <0x0>; linux,phandle = <0x30>; phandle = <0x30>; }; ... serial@01c28800 { compatible = "snps,dw-apb-uart"; reg = <0x1c28800 0x400>; interrupts = <0x3>; reg-shift = <0x2>; reg-io-width = <0x4>; clocks = <0x28 0x12>; status = "okay"; pinctrl-names = "default"; pinctrl-0 = <0x30>; }; And it works fine ! Thank you for your help on that problem, Nathanaël.

I've installed dtc via wget -c https://raw.github.com/RobertCNelson/tools/master/pkgs/dtc.sh I've got the version : DTC 1.4.0-gf345d9e4 EDIT : I removed dtc and the libs associate with it and I reinstalled it via apt-get. It now outputs: Version: DTC 1.4.0

It doesn't work either. In the first part, I replace "SUN4I_PINCTRL_10_MA" and "SUN4I_PINCTRL_NO_PULL" by 0x0 because the compiler doesn't know these references and raise an error. I also add "serial@01c28800" after the alias "uart2:" and then it compiles without errors. But when tested, the previous command (dmesg and the cat) return the same things again.

Sorry for the late answer. We've already seen this solution but our syntax doesn't match with your exemples. For exemple, for the UART0, we have this : pinctrl@01c20800 { ... uart0@0 { allwinner,pins = "PB22", "PB23"; allwinner,function = "uart0"; allwinner,drive = <0x0>; allwinner,pull = <0x0>; linux,phandle = <0x29>; phandle = <0x29>; }; ... }; ... serial@01c28000 { compatible = "snps,dw-apb-uart"; reg = <0x1c28000 0x400>; interrupts = <0x1>; reg-shift = <0x2>; reg-io-width = <0x4>; clocks = <0x28 0x10>; status = "okay"; pinctrl-names = "default"; pinctrl-0 = <0x29>; }; instead of : uart0: serial@01c28000 { pinctrl-names = "default"; pinctrl-0 = <&uart0_pins_a>; status = "okay"; }; So we tried to add this to enable the UART2, but it failed : pinctrl@01c20800 { ... uart2@0 { allwinner,pins = "PI18", "PI19"; allwinner,function = "uart2"; allwinner,drive = <0x0>; allwinner,pull = <0x0>; linux,phandle = <0x30>; phandle = <0x30>; }; ... }; ... serial@01c28800 { compatible = "snps,dw-apb-uart"; reg = <0x1c28800 0x400>; interrupts = <0x3>; reg-shift = <0x2>; reg-io-width = <0x4>; clocks = <0x28 0x12>; pinctrl-names = "default"; pinctrl-0 = <0x30>; status = "okay"; }; When we try your exemple, we have this error during the compilation : ERROR (phandle_references): Reference to non-existent node or label "uart2_pins_a" ERROR: Input tree has errors, aborting (use -f to force output) And when we replace "uart2_pins_a" by 0x30 (to match with the uart2 phandle), it compiles but doesn't work, and the previous command return the same things (dmesg and cat on /proc/tty/driver/serial).

Hello, Thank you for your quick answer. We've executed your commands and these are the results : uname -a : Linux lime-a10 4.1.6-sunxi #20 SMP Mon Aug 24 09:27:58 CEST 2015 armv7l GNU/Linux dmesg | egrep "serial|uart": [ 1.978936] 1c28000.serial: ttyS0 at MMIO 0x1c28000 (irq = 28, base_baud = 1500000) is a U6_16550A [ 3.155880] systemd[1]: Starting system-serial\x2dgetty.slice. [ 3.156606] systemd[1]: Created slice system-serial\x2dgetty.slice. sudo cat /proc/tty/driver/serial: serinfo:1.0 driver revision: 0: uart:U6_16550A mmio:0x01C28000 irq:28 tx:56 rx:0 RTS|DTR 1: uart:unknown port:00000000 irq:0 2: uart:unknown port:00000000 irq:0 3: uart:unknown port:00000000 irq:0 4: uart:unknown port:00000000 irq:0 5: uart:unknown port:00000000 irq:0 6: uart:unknown port:00000000 irq:0 7: uart:unknown port:00000000 irq:0 We've mistaken in the first Anthony's post, it's not uart0 that we want to enable, but uart2. Regards, Nathanaël.