Hi, I could really need some help to get the second application uart working on my imx23 based board. I've seen this message: http://article.gmane.org/gmane.linux.serial/9184/: "But in mx23, the DMA has a bug(see errata:2836). We can not add the DMA support in mx23" Hopefully there is only something wrong with my devicetree. In arm/boot/dts/imx23-olinuxino.dts I've added: auart1: serial@8006e000 { pinctrl-names = "default"; pinctrl-0 = <&auart1_2pins_a>; status = "okay"; }; And in arch/arm/boot/dts/imx23.dtsi I've added: auart1_2pins_a: auart1-2pins@0 { reg = <0>; fsl,pinmux-ids = < 0x00e0 /* MX23_PAD_GPMI_D14__GPMI_D14 */ 0x00f0 /* MX23_PAD_GPMI_D15__GPMI_D15 */ >; fsl,drive-strength = <0>; fsl,voltage = <1>; fsl,pull-up = <0>; }; I've adapted both from auart0 that was working on my OLinuXino. The device /dev/ttyAPP1 is available and the serial getty should be configured correctly because I can use /dev/ttyAPP0 on my OLinuXino and I've configured it here in the same way. I can also eliminate a hardware problem because I have a working minimal example without OS where I can receive something on auart1. Here is my current devicetree: - http://www.jann.cc/_downloads/next-20130910_imx23.dtsi, - http://www.jann.cc/_downloads/next-20130910_imx23-olinuxino.dts, - http://www.jann.cc/_downloads/next-20130910.diff It wasn't working in 3.9.4 and 3.10.11 too. And my odyssey is documented here: - http://www.jann.cc/2013/08/31/porting_linux_to_a_new_board.html#step-4-the-application-uart I can use GDB to debug the kernel but I don't really know where to start, maybe something is broken in drivers/tty/serial/mxs-auart.c. Hopefully somebody could give me a hint what to do. -- chris -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
