we need a new way to access serial ports

[acollins at icsmail.net]

Hi all.  You could write a serial connector that would read the
softsynth device, and write to the specified /dev serial device.  That
would mean you couldn't start speakup until after the file systems were
mounted, but you'd be no worse off than you are now using a software
synth.  Plus the serial access could access all kinds of serial devices.

Gene

>On Sun, Jun 27, 2010 at 01:00:40PM -0500, Christopher Brannon wrote:
>> > Is there any way you could open the port from kernel space as though you
>> > were in user space and just write to it without taking exclusive
>> > control?
>
>You can't access "/dev/ttyS0" for example the same way from kernel space
>that you do from user space.  The open(), read(), write() and close()
>calls are for user space applications and we do not have access to them
>inside the kernel.
>
>To stay in kernel space, we need to convert to using the kernel's tty
>layer to access serial synthesizers. It will take a complete rewrite of
>the serial i/o routines to make this happen.
>
>Also, we need access to devices some how from within the kernel in order
>to use usb devices -- we need to be able to do the equivalent of
>open("/dev/something"), which I do not know how to do at this point.
>
>If anyone has any suggestions or patches to make this happen, they will
>be most welcome.
>
>Thanks,
>
>William
>
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