[Buildroot] can't open /dev/tty No such device or address

[Buildroot] can't open /dev/tty No such device or address

[jeff angielski]

I am getting the following errors when trying to boot a CRAMFS image on
my PowerPC target.

can't open /dev/tty1: No such device or address
can't open /dev/tty2: No such device or address
can't open /dev/tty3: No such device or address
<repeats over and over>


If I log into the system through my serial port (/dev/ttyCPM0) you can
see that the char devs exist in the fileystem.

crw-rw-rw-  1 root     root       4,   1 Dec 31 17:00 tty1             
crw-rw-rw-  1 root     root       4,   2 Dec 31 17:00 tty2             
crw-rw-rw-  1 root     root       4,   3 Dec 31 17:00 tty3  


The node info matches the device_table.txt.

Any idea what is going on here?  Anybody else seeing this?


-- 
Jeff Angielski
The PTR Group
www.theptrgroup.com

[Buildroot] can't open /dev/tty No such device or address

[Hamish Moffatt]

On Mon, Feb 02, 2009 at 05:29:05PM -0500, jeff angielski wrote:
> 
> I am getting the following errors when trying to boot a CRAMFS image on
> my PowerPC target.
> 
> can't open /dev/tty1: No such device or address
> can't open /dev/tty2: No such device or address
> can't open /dev/tty3: No such device or address
> <repeats over and over>
> 
> 
> If I log into the system through my serial port (/dev/ttyCPM0) you can
> see that the char devs exist in the fileystem.
> 
> crw-rw-rw-  1 root     root       4,   1 Dec 31 17:00 tty1             
> crw-rw-rw-  1 root     root       4,   2 Dec 31 17:00 tty2             
> crw-rw-rw-  1 root     root       4,   3 Dec 31 17:00 tty3  
> 
> 
> The node info matches the device_table.txt.
> 
> Any idea what is going on here?  Anybody else seeing this?

You have the /dev entries but no driver for device 4, 1 etc in the
kernel.


Hamish
-- 
Hamish Moffatt VK3SB <hamish@debian.org> <hamish@cloud.net.au>

[Buildroot] can't open /dev/tty No such device or address

[jeff angielski]

On Tue, 2009-02-03 at 10:24 +1100, Hamish Moffatt wrote:
> On Mon, Feb 02, 2009 at 05:29:05PM -0500, jeff angielski wrote:
> > 
> > I am getting the following errors when trying to boot a CRAMFS image on
> > my PowerPC target.
> > 
> > can't open /dev/tty1: No such device or address
> > can't open /dev/tty2: No such device or address
> > can't open /dev/tty3: No such device or address
> > <repeats over and over>
> > 
> > 
> > If I log into the system through my serial port (/dev/ttyCPM0) you can
> > see that the char devs exist in the fileystem.
> > 
> > crw-rw-rw-  1 root     root       4,   1 Dec 31 17:00 tty1             
> > crw-rw-rw-  1 root     root       4,   2 Dec 31 17:00 tty2             
> > crw-rw-rw-  1 root     root       4,   3 Dec 31 17:00 tty3  
> > 
> > 
> > The node info matches the device_table.txt.
> > 
> > Any idea what is going on here?  Anybody else seeing this?
> 
> You have the /dev entries but no driver for device 4, 1 etc in the
> kernel.

You are correct.  At some point while I was trying to get my serial
port, /dev/ttyCPM0, up and running as the serial console in buildroot I
must have inadvertently disabled Virtual Terminals in the kernel config
file.  Once I enabled them again all was well.

Thanks for the info.


-- 
Jeff Angielski
The PTR Group
www.theptrgroup.com

[Buildroot] can't open /dev/tty No such device or address

[Peter Korsgaard]

>>>>> "jeff" == jeff angielski <jeff@theptrgroup.com> writes:

Hi,

 jeff> You are correct.  At some point while I was trying to get my
 jeff> serial port, /dev/ttyCPM0, up and running as the serial console
 jeff> in buildroot I must have inadvertently disabled Virtual
 jeff> Terminals in the kernel config file.  Once I enabled them again
 jeff> all was well.

We don't seem to have ttyCPMx devices listed in the default
/etc/securetty, what major/minor device numbers does it use and how
many are typically present?

-- 
Bye, Peter Korsgaard

[Buildroot] can't open /dev/tty No such device or address

[jeff angielski]

On Tue, 2009-02-03 at 08:01 +0100, Peter Korsgaard wrote:
> >>>>> "jeff" == jeff angielski <jeff@theptrgroup.com> writes:
> 
> Hi,
> 
>  jeff> You are correct.  At some point while I was trying to get my
>  jeff> serial port, /dev/ttyCPM0, up and running as the serial console
>  jeff> in buildroot I must have inadvertently disabled Virtual
>  jeff> Terminals in the kernel config file.  Once I enabled them again
>  jeff> all was well.
> 
> We don't seem to have ttyCPMx devices listed in the default
> /etc/securetty, what major/minor device numbers does it use and how
> many are typically present?

These are serial ports from the 2.6.x kernel based on the CPM core in
the PowerPC processors.  They can be found in the linux kernel under
linux/drivers/serial/cpm_uart.

Here is what I added to the device_table.txt to make it work.

/dev/ttyCPM c	666	0	0	204	46	0	1	6


-- 
Jeff Angielski
The PTR Group
www.theptrgroup.com

[Buildroot] can't open /dev/tty No such device or address

[Peter Korsgaard]

>>>>> "jeff" == jeff angielski <jeff@theptrgroup.com> writes:

 jeff> Here is what I added to the device_table.txt to make it work.

 jeff> /dev/ttyCPM c	666	0	0	204	46	0	1	6

6 nodes? devices.txt seems a bit broken in this regard, but it seems
like only the region 46..49 has been reserved for cpm.

I've updated the generic device_table.txt / securetty with
ttyCPM[0-3].

-- 
Bye, Peter Korsgaard