On Friday 21 March 2014, Rob Herring wrote: > From: Rob Herring <robh@xxxxxxxxxx> > > This started out as an attempt to add arm64's earlyprintk support to ARM > in order to get an earlier, runtime setup console on multi-platform > kernels. The first issue was needing the fixmap support which > conveniently Mark Salter was working on and is mostly in place now. Like > many things on ARM and arm64 now, it then became where do I put the now > common, shared code. After digging more into various early console/printk > support, it turns out the 8250_early.c setup code was the best starting > point. > > This is based on Mark Salter's fixmap support currently in linux-next. > This is tested on arm64 and ARM with pl011 and 8250. The ARM support > also requires fixmap and fixed mapping support which are not yet in place. > I have some patches in my tree to support fixmap, but they need some more > work. Fortunately, once fixmap is in place, it is just a Kconfig option > to enable earlycon support on ARM. A git tree is available here[1]. > > Based on this series, I would like to add support for doing earlycon > setup using DT. Hi Rob, I like this series a lot, great work! I would consider the DT parsing support essential here, we should not merge the patches until that is done as well, because I don't want to see users pass earlycon command line options in DT when they can use the established "linux,stdout-path" property instead. I would expect that in almost every case in which we are booting using DT today, we can just use linux,stdout-path to locate the device that the boot loader has already set up and start usign it. Arnd -- 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
