Config options on kernel .config.

[Valdis.Kletnieks at vt.edu]

On Mon, 19 May 2014 17:06:41 -0300, Lucas Tanure said:

> How to get the help for a specific kernel compile option.
> Like, you do a "cat .config" in your .config file and see:
> CONFIG_GENERIC_CALIBRATE_DELAY=y

Run 'make menuconfig'.   Once in it, hit / to get a search box.
Enter GENERIC_CALIBRATE_DELAY  (or a substring of that).  Hit enter, and
enjoy. :)

 Symbol: GENERIC_CALIBRATE_DELAY [=y]                                                                                     x
  x Type  : boolean                                                                                                          x
  x   Defined at arch/x86/Kconfig:193                                                                                        x
  x

That's not very helpful.

%  find . -name 'Kconf*' | xargs grep GENERIC_CALIB
./lib/Kconfig.debug:    depends on DEBUG_KERNEL && PRINTK && GENERIC_CALIBRATE_DELAY
./arch/metag/Kconfig:config GENERIC_CALIBRATE_DELAY
./arch/sh/Kconfig:config GENERIC_CALIBRATE_DELAY
(and lots more).

Turns out it's basically a flag for "This arch is able to support
the BOOT_PRINTK_DELAY option"....

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