El Wed, Jul 15, 2009 at 02:56:41PM +0800 vichy ha dit:
> >
> > t...@fuckup:~/work$ ls -al /dev/ttyS*
> > crw-rw---- 1 root dialout 4, 64 2009-07-12 14:46 /dev/ttyS0
> > crw-rw---- 1 root dialout 4, 65 2009-07-12 14:46 /dev/ttyS1
> > crw-rw---- 1 root dialout 4, 66 2009-07-12 14:46 /dev/ttyS2
> > crw-rw---- 1 root dialout 4, 67 2009-07-12 14:46 /dev/ttyS3
> >
> as you can see the minor number of /dev/ttyS1 is 65.
> if I remember correctly, each driver has to register its device node
> with major, minor number.
> In 8250.c, the 8250_init will assign each 8250 device with 8250
> driver which minor number is 64.
> if I have 2 8250 serial devices, it seems impossible I can driver my
> second 8250 serial device through /dev/ttyS1, since driver is
> registered for minor 64 but ttyS1 is minor 65.
the driver is identified by the major number and reserves a range of
minor numbers (one for each device), the minor number identifies the
device
--
Matthias Kaehlcke
Embedded Linux Engineer
Barcelona
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(Richard Stallman)
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