On 03/04/2015 06:38 PM, Arnd Bergmann wrote: > On Wednesday 04 March 2015 15:59:55 Chanwoo Choi wrote: >> On 03/02/2015 06:22 AM, Arnd Bergmann wrote: >>> On Saturday 28 February 2015 09:47:01 Chanwoo Choi wrote: >>>> "earlycon=exynos4210,0x14C20000" is correct bootparam. You can check >>>> it on Documentation/kernel-parameters.txt as following. >>>> >>>> exynos4210,<addr> >>>> Use early console provided by serial driver available >>>> on Samsung SoCs, requires selecting proper type and >>>> a correct base address of the selected UART port. The >>>> serial port must already be setup and configured. >>>> Options are not yet supported. >>>> >>>> >>> >>> But it's crazy to do this when you have a DT. Please fix the existing >>> devicetree files that use this to just list 'earlycon'. >>> >>> The syntax above only makes sense for classic board files that we >>> do not support for exynos any more. >> >> Following earlycon patch for exynos soc was merged in Linux 4.0-rc1. >> - commit-id: b94ba0328d3b36ff95f5074c0e9b44f90dc56bb5 (serial: samsung: Add support for early console) >> Almost Exynos SoC use the same UART IP of Exynos4210. >> >> If you mean that "earlycon=exynos4210" naming will be changed to "earlycon=exynos", >> we have to modify the drivers/tty/serial/samsung.c. > > No, what I mean is that you should use just "earlycon" instead of "earlycon=..." > when you have a DTB. You have the OF_EARLYCON_DECLARE() in the driver as > well, so that should just work. > > EARLYCON_DECLARE() is really just a hack that allows users to override the > early console from the command line without modifying the stdout-path > property. Don't put that into a dts file. OK, I understand. Thanks for your comment. Regards, Chanwoo Choi -- 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
