Thanks, Tony. I checked my .config and this option is enabled. FYI, I raised this issue in u-boot mailing-list, too. It seems to be a bug in u-boot and only happens to certain version of pandaboard. The name of the thread is "No single character output after update to latest u-boot on pandaboard" On Tue, Nov 26, 2013 at 12:20 PM, Tony Lindgren <tony@xxxxxxxxxxx> wrote: > * Chao Xu <caesarxuchao@xxxxxxxxx> [131122 19:28]: >> "I wonder if we also have some dependency to some earlier versions of >> u-boot as u-boot now only muxes the essential pins?" >> This is exactly the problem in my case. I added "#define >> CONFIG_SYS_ENABLE_PADS_ALL" in u-boot/include/configs/omap4_common.h >> and now there is output. >> >> I guess the reason that the u-boot worked out-of-box for Ben but not >> for me is that I missed some configurations in v3.12 kernel. I image >> there is a config options that tells the kernel to take care of the >> non-essential pins that used to be the responsibility of u-boot. Could >> you confirm my hypothesis? And if so, could you kindly suggest what's >> the name of the config option? > > That would be CONFIG_PINCTRL_SINGLE=y for device tree based omaps. > But if we have the configuration missing for some driver in the > board specific .dts file, that won't help naturally. We do have > PINCTRL_SINGLE enabled in omap2plus_defconfig. > > Regards, > > Tony -- Regards, Chao Xu -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
