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nimar n00b
Joined: 06 Dec 2007 Posts: 50 Location: So CA
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Posted: Sat Apr 27, 2013 4:25 pm Post subject: is there a way to create a .config file from existing kernel |
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I accidentally deleted the .conifg file from /usr/src/linux uisng rm. Ah well, my bad.
any way to recreate .config from exisiting bzImage or running kernel in /boot?
can't remeber all the settings and trying not to reinvent MY wheel.
Regards
-N |
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Logicien Veteran
Joined: 16 Sep 2005 Posts: 1555 Location: Montréal
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Posted: Sat Apr 27, 2013 4:57 pm Post subject: |
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Check in the /proc directory if you have a file named config.gz . It is the configuration file of the running kernel compressed with Gzip.
Some options, CONFIG_IKCONFIG and CONFIG_IKCONFIG_PROC , need to be activated in the running kernel to be able to retreive the file. You can use a script in the Linux kernel source tree, to recreate a kernel configuration from it's image when the CONFIG_IKCONFIG option have been activated:
Code: | CONFIG_IKCONFIG:
This option enables the complete Linux kernel ".config" file
contents to be saved in the kernel. It provides
of which kernel options are used in a running kernel or in an on-disk kernel.
This information can be extracted from the kernel
image file with the script scripts/extract-ikconfig and used as
input to rebuild the current kernel or to build another kernel.
It can also be extracted from a running kernel by reading
/proc/config.gz if enabled (below).
Symbol: IKCONFIG [=y]
Type : tristate
Prompt: Kernel .config support
Defined at init/Kconfig:681
Location:
-> General setup |
_________________ Paul
Last edited by Logicien on Sat Apr 27, 2013 5:09 pm; edited 1 time in total |
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DONAHUE Watchman
Joined: 09 Dec 2006 Posts: 7651 Location: Goose Creek SC
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Posted: Sat Apr 27, 2013 4:58 pm Post subject: |
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if you enabled Code: | <*> Kernel .config support
[*] Enable access to .config through /proc/config.gz | /proc/config.gz will exist and can be used as you wish by Code: | zcat /proc/config.gz > /usr/src/linux/.config |
_________________ Defund the FCC. |
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Ant P. Watchman
Joined: 18 Apr 2009 Posts: 6920
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Posted: Sat Apr 27, 2013 5:16 pm Post subject: |
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If all else fails, you can run `make localyesconfig` in the kernel tree and it'll reselect all your currently in-use drivers. |
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nimar n00b
Joined: 06 Dec 2007 Posts: 50 Location: So CA
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Posted: Sat Apr 27, 2013 5:30 pm Post subject: |
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Thank you! I will give the suggestions a try and get back! |
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nimar n00b
Joined: 06 Dec 2007 Posts: 50 Location: So CA
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Posted: Sat Apr 27, 2013 5:44 pm Post subject: |
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Quote: | Check in the /proc directory if you have a file named config.gz |
Not there. Then tried Quote: | 'make localyesconfig' | and got:
Code: |
linux # make localyesconfig
HOSTCC scripts/basic/fixdep
HOSTCC scripts/kconfig/conf.o
SHIPPED scripts/kconfig/zconf.tab.c
SHIPPED scripts/kconfig/zconf.lex.c
SHIPPED scripts/kconfig/zconf.hash.c
HOSTCC scripts/kconfig/zconf.tab.o
In file included from scripts/kconfig/zconf.tab.c:2503:0:
scripts/kconfig/menu.c: In function 'get_symbol_str':
scripts/kconfig/menu.c:561:18: warning: 'jump' may be used uninitialized in this function [-Wuninitialized]
scripts/kconfig/menu.c:515:19: note: 'jump' was declared here
HOSTLD scripts/kconfig/conf
No config file found at scripts/kconfig/streamline_config.pl line 123.
make[1]: *** [localyesconfig] Error 2
make: *** [localyesconfig] Error 2
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Darn! serves me right.
anything else?
I hate to reinvent the wheel, but it looks like I'll have to do a better job of keeping my exsting wheels round... |
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Ant P. Watchman
Joined: 18 Apr 2009 Posts: 6920
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Posted: Sat Apr 27, 2013 5:50 pm Post subject: |
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You might need to run a normal make defconfig first. |
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DONAHUE Watchman
Joined: 09 Dec 2006 Posts: 7651 Location: Goose Creek SC
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nimar n00b
Joined: 06 Dec 2007 Posts: 50 Location: So CA
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Posted: Sat Apr 27, 2013 6:34 pm Post subject: |
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While I hate it to pieces, looks like I'll have to run 'make defconfig' and move on.
Thank you all for the suggestions. I guess one of the things I WILL add is
Quote: |
<*> Kernel .config support
[*] Enable access to .config through /proc/config.gz |
regards
-N |
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NeddySeagoon Administrator
Joined: 05 Jul 2003 Posts: 54028 Location: 56N 3W
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Posted: Sat Apr 27, 2013 7:43 pm Post subject: |
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nimar,
Do you have any old kernel .config files you can use for a starting point ? _________________ Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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