Discussion:
missing /dev/tty0
Louis Lai
2005-10-28 09:46:23 UTC
Permalink
Hi all,

I am using a 2.4.30 kernel for my MIPS embedded processor. The kernel can
start up properly but the tty0 doesn't exist under /dev. I have already
enable the virtual console during kernel configuration. is it something
configure not properly for the kernel?? Anyone can help??

Thanks in advance,
Louis
Yoann Allain
2005-10-28 10:26:55 UTC
Permalink
Post by Louis Lai
Hi all,
I am using a 2.4.30 kernel for my MIPS embedded processor. The kernel =
can
Post by Louis Lai
start up properly but the tty0 doesn't exist under /dev. I have alread=
y
Post by Louis Lai
enable the virtual console during kernel configuration. is it somethin=
g
Post by Louis Lai
configure not properly for the kernel?? Anyone can help??
Thanks in advance,
Louis
=20
Hi Louis,

The problem is that you didn't create the special file /dev/tty0. Creat=
e=20
it with the mknod command :
# mknod /dev/tty0 c 4 0
Then put the good rights, for example:
# chmod 640 /dev/tty0
That should do it...

Yoann
Louis Lai
2005-10-28 10:43:31 UTC
Permalink
Hi Yoann,

Thanks for your reply!!
i can create the device file but i still not able to open it.
When i open /dev/tty0, i got "No such device".
Any ideas??

Thanks again,
Louis

-----Original Message-----
=46rom: Yoann Allain [mailto:***@avilinks.com]
Sent: Friday, October 28, 2005 6:27 PM
To: Louis Lai
Cc: linuxconsole-***@lists.sourceforge.net; linux-***@linux-mips.org
Subject: Re: missing /dev/tty0
Post by Louis Lai
Hi all,
I am using a 2.4.30 kernel for my MIPS embedded processor. The kernel =
can
Post by Louis Lai
start up properly but the tty0 doesn't exist under /dev. I have alread=
y
Post by Louis Lai
enable the virtual console during kernel configuration. is it somethin=
g
Post by Louis Lai
configure not properly for the kernel?? Anyone can help??
Thanks in advance,
Louis
Hi Louis,

The problem is that you didn't create the special file /dev/tty0. Creat=
e
it with the mknod command :
# mknod /dev/tty0 c 4 0
Then put the good rights, for example:
# chmod 640 /dev/tty0
That should do it...

Yoann
Yoann Allain
2005-10-28 12:23:29 UTC
Permalink
You should something like that at the output of
$ ls -l /dev/tty?
crw--w---- 1 root root 4, 0 2005-03-19 20:36 /dev/tty0
crw-rw---- 1 root tty 4, 1 2005-10-24 18:24 /dev/tty1
crw-rw---- 1 root tty 4, 2 2005-10-24 18:24 /dev/tty2
=2E..
$

You wrote about virtual consoles: in this case you should have=20
CONFIG_VT=3Dy in .config file.
Or at least you should something like this at the output of=20

$ grep CONFIG_SERIAL_CONSOLE /where-your-kernel-sources-are/.config
CONFIG_SERIAL_CONSOLE=3Dy
$

But be aware of:
"If you don't have a VGA card installed and you say Y here, the
kernel will automatically use the first serial line, /dev/ttyS0, as
system console."

This is from HELP command in menuconfig...

I'll hope this will help...

Yoann
Post by Louis Lai
Hi Yoann,
Thanks for your reply!!
i can create the device file but i still not able to open it.
When i open /dev/tty0, i got "No such device".
Any ideas??
Thanks again,
Louis
-----Original Message-----
Sent: Friday, October 28, 2005 6:27 PM
To: Louis Lai
Subject: Re: missing /dev/tty0
=20
Post by Louis Lai
Hi all,
I am using a 2.4.30 kernel for my MIPS embedded processor. The kernel=
can
Post by Louis Lai
Post by Louis Lai
start up properly but the tty0 doesn't exist under /dev. I have alrea=
dy
Post by Louis Lai
Post by Louis Lai
enable the virtual console during kernel configuration. is it somethi=
ng
Post by Louis Lai
Post by Louis Lai
configure not properly for the kernel?? Anyone can help??
Thanks in advance,
Louis
=20
Hi Louis,
The problem is that you didn't create the special file /dev/tty0. Crea=
te
Post by Louis Lai
# mknod /dev/tty0 c 4 0
# chmod 640 /dev/tty0
That should do it...
Yoann
=20
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