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jagdpanther
l33t
Joined: 22 Nov 2003
Posts: 768
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 Posted: Sat Dec 12, 2009 2:54 pm Post subject: [Solved] /dev/ttyS0 missing in kernel 2.6.31.7 |
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After upgrading from kernel 2.6.31.6 to 2.6.31.7 (I used make oldconfig, so the kernel config didn't change much & I am using the kernel from kernel.org not Gentoo's.) /dev/ttyS0 no longer exists. ttyS1-ttyS3 devices exist (although there are no hardware ports to associate with them.)
The following two lines did show up in messages:
1247 Dec 12 06:33:05 runner kernel: serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
1248 Dec 12 06:33:05 runner kernel: 00:08: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
So the kernel still sees the device but no ttyS0 entry in /dev/
Any ideas?
(If I revert to 2.6.31.6 /dev/ttyS0 returns.)
Last edited by jagdpanther on Tue Dec 15, 2009 8:02 pm; edited 1 time in total |
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01allein
Tux's lil' helper
Joined: 09 Jun 2009
Posts: 127
Location: AUSTRALIA
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| Posted: Sun Dec 13, 2009 1:37 am Post subject: |
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Why to use www.kernel.org instaead of Gentoos?
That way you save from problems. |
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jagdpanther
l33t
Joined: 22 Nov 2003
Posts: 768
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| Posted: Sun Dec 13, 2009 3:10 am Post subject: |
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I guess this is a little off topic and I hope I do not ruffle any feathers with my last reason below but here are three reasons that I use http://www.kernel.org kernels instead of gentoo:
1. Sometimes I need the latest kernel for a new piece of hardware I am trying.
2. I like to run almost the latest kernel to see if there are kernel compatibility issues with certain pieces of software (Like VMware, VirtualBox, nmap etc.) that I support at work.
3. Kernel security issues seem to be addressed a little faster by using the latest stable kernel.org kernel.
Back to the topic ... any guesses on the lack of /dev/ttyS0? |
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boerKrelis
Apprentice
Joined: 01 Jul 2003
Posts: 241
Location: The Netherlands
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| Posted: Sun Dec 13, 2009 9:37 pm Post subject: |
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| jagdpanther wrote: | | Any ideas? |
Well, here's a
| Code: | # zgrep -i serial /proc/config.gz
# CONFIG_SERIAL_NONSTANDARD is not set
# Serial drivers
CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_CONSOLE=y
CONFIG_SERIAL_8250_PCI=y
CONFIG_SERIAL_8250_PNP=y
CONFIG_SERIAL_8250_NR_UARTS=4
CONFIG_SERIAL_8250_RUNTIME_UARTS=4
# CONFIG_SERIAL_8250_EXTENDED is not set
# Non-8250 serial port support
CONFIG_SERIAL_CORE=y
CONFIG_SERIAL_CORE_CONSOLE=y
# CONFIG_SERIAL_JSM is not set
# CONFIG_USB_SERIAL is not set
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from a vanilla
| Code: |
# uname -a
Linux xxxxx 2.6.32 #1 Thu Dec 3 13:11:21 CET 2009 i586 Geode(TM) Integrated Processor by AMD PCS AuthenticAMD GNU/Linux
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which you could compare to your kernel config, as this one has a ttyS0 which I'm very much using ;-) |
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Hu
Administrator
Joined: 06 Mar 2007
Posts: 23075
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| Posted: Tue Dec 15, 2009 2:55 am Post subject: |
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| Since the functional and non-functional kernels are from the same major release (2.6.31.x), it should be viable to compare their respective configurations with diff -u. |
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jagdpanther
l33t
Joined: 22 Nov 2003
Posts: 768
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| Posted: Tue Dec 15, 2009 8:01 pm Post subject: [Solved] /dev/ttyS0 missing in kernel 2.6.31.7 |
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Diffing the 2.6.31.6 vs 2.6.31.7 kernel configuration files was a good idea. However the only difference was the comment with the date and comment with the kernel version. (This makes sense because I configured 2.6.31.7 with "make oldconfig").
I solved the issue by upgrading to 2.6.31.8. (Was there a bug in .7?)
Thanks for the replies. |
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