[BRLTTY] BRLTTY in GRUB

[Dave Mielke]

[quoted lines by Vladimir 'φ-coder/phcoder' Serbinenko on 2012/03/15 at 20:10 +0100]

>Currently with a pointer to a structure. 

Has there been no need yet to identify a USB device in, say, grub.conf?

>Using serial number in finding is good, 

Specifying the serial number is optional. Most users don't specify it. The 
normal case is that each driver knows which vendour/product ids it supports.

I've considered adding a more direct way, like specifying the bus number and 
device address, but such identifiers really aren't user friendly, which is why 
it hasn't been done (yet). Remember that a braille user can't see his screen in 
order to inspect the system before his braille deivce is up and running, so 
it's kind of impossible for him to figure out that kind of dynamic device 
identification ahead of time. There's a similar problem with the way Linux 
creates ttyUSBn devices, whcih is one reason we added direct USB support.

>just I'd like to prefix it with usb/ to avoid any collistion with serial. 

There's no collisiion from a brltty perspective. If the user specifies usb: 
then the device identifier is interpreted in a strictly USB context. The same 
is true for serial:. What may be confusing is that serial: is still optional 
(for backward compatibility) since only serial devices used to be supported. 
Giving just a device name (or path), therefore, is always interpreted as if 
serial: were specified. If the user wants USB, he must specify usb:.

For example: If a user has a braille device which supports USB through a serial 
adapter, then he could say serial:ttyUSBn (brltty will use serial I/O through 
the virtual serial device), or he could say usb: (brltty will use direct USB 
operations).

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