On Thu, Aug 25, 2016 at 10:12:35PM +0800, Icenowy Zheng wrote: > >> But many codes will require a ttyS0 as console... So I think the > >> bluetooth should be located at ttyS1... > > > > Most of them would use /dev/console anyway. What do you have in mind? > > As a general configuration, /dev/ttyS0 will be indicated as the default > console= > value... (Otherwise more boards will fail)
There's no reason to make that assumption. The console might be on another UART entirely (ttyS3, for the sake of the argument), on a different UART "class" (ttyUSB?, framebuffer console?), or not present at all. If you want to use the console, use /dev/console. I don't what's so special about the UART here. Every single device in Linux behaves that way. Maxime -- Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com
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