On 04/19/2016 09:31 AM, Samuel Thibault wrote: > Peter Hurley, on Tue 19 Apr 2016 09:26:41 -0700, wrote: >> On 04/19/2016 09:15 AM, Samuel Thibault wrote: >>> Peter Hurley, on Tue 19 Apr 2016 09:11:24 -0700, wrote: >>>>>> The question is: how does speakup set the line discipline from kernel >>>>>> land? One of the goals of speakup is to be available before userland >>>>>> works (otherwise we could as well just move the drivers to userland), so >>>>>> we don't have any userland helper to set the line disciline up. >>>> >>>> Can you help me understand why "one of the goals of speakup is to be available >>>> before userland"? >>> >>> For exactly the same reasons that we have a VGA driver before the >>> installed system or initrd can take hand. >> >> Hmmm. I don't have a VGA "driver" before initrd. >> I have VGA output > > Then you have a VGA driver. > >> but that goes through console write, not through tty. > > The console *is* a tty. Console has two meanings which appear to be the same thing but are not: 1. a tty device (aliased as /dev/console) 2. struct console. For printk() messages. The second meaning only indirectly interacts with the tty core, so for example, there is no way to specify a line discipline for struct console output. So if you want to hear boot messages, hooking up a line discipline isn't going to work. A clear statement of what you want to achieve will help me help you. Regards, Peter Hurley -- 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
