Hi Peter. 2015-10-21 21:46 GMT+09:00 Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>: > On 10/21/2015 04:58 AM, Sudeep Holla wrote: >> On 21/10/15 06:09, Masahiro Yamada wrote: >>> I think there exist two ways to specify the console port and baudrate. >>> >>> >>> [1] Specify console in bootargs >>> >>> chosen { >>> bootargs = "console=ttyS0,115200"; >>> }; >>> >>> >>> [2] Specify stdout-path >>> >>> chosen { >>> stdout-path = "serial0:115200n8"; >> >> This will work for even early/boot console, so this is better than >> option [1] > > Be aware that options specified via /chosen/stdout-path are > currently ignored by earlycon. There were some hiccups getting the > initial support upstream; when 4.4 hits mainline, I'll resubmit > my series that implements the of_serial i/o properties and > options passthrough to earlycon setup. As I said in another thread ("serial: earlycon: allow to specify uartclk in earlycon kernel-parameter"), stdout-path can pass dev->baud, but not port->uartclk. It is usually specified "clocks" phandle, but clk is not ready at the point of earlycon. It seems impossible to set up the baudrate even if the options are passed. -- Best Regards Masahiro Yamada -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html