Messages in this thread | | | Date | Sun, 4 Mar 2012 01:43:48 +0100 | From | Samuel Thibault <> | Subject | Re: speakup bug |
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Ted Ts'o, le Sat 03 Mar 2012 19:41:16 -0500, a écrit : > On Sun, Mar 04, 2012 at 01:21:11AM +0100, Samuel Thibault wrote: > > Samuel Thibault, le Sun 04 Mar 2012 01:18:06 +0100, a écrit : > > > Just for the record: what we need is being able to open a serial port > > > and read/write from inside the kernel. Using a daemon that does the open > > > and setting up speakup as a line discipline would be possible, but it > > > then depends on / working, and that's not something e.g. administrators > > > can really afford depending on. > > > > BTW: yes, that does not mean that speakup couldn't use a line discipline > > already. Sure, still on the TODO list for years too. > > Actualy you *can* open a tty from the kernel. Look at how > /dev/console is opened in kernel_init() in init/main.c.
But that still needs /dev
> If you don't even want a dependency on /, life gets a little harder, > but is that really that important?
Yes. It does happen that / can not be mounted: disk encryption, disk failure, nfs failure, etc. And without any feedback, it's very hard to know what happened.
> The advantages of doing it cleanly > is that it will work on systems that don't have a normal serial port, > but only have a USB interface (for example, if you were going to try > to hack in support for a mobile device or some other embedded system).
Sure! But there should be a way to do it without /, just like the serial console works on ttyUSB0 without /.
Samuel -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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