On Tue, 2004-08-03 at 07:16 -0400, Robert P. J. Day wrote: > On Tue, 3 Aug 2004, Edwin Dicker wrote: > > > Hi all, > > > > I only unserstand some basics of kernel compiling. I understand that the > > kernel source RPM comes with some configs for compiling the kernel. What I > > would like to know is: Is the kernel binary RPM compiled with one of the > > configs which are present in the kernel source RPM ? > > on a fresh system, there's a good chance that the associated config > file is actually in /boot, with the name config-<whatever version>. > at least, that's a good place to start. I believe the configuration file's in /usr/src/linux-version/configs/ are the ones that are used to compile the kernels in the first place, so if one was to recompile the kernel using one of those files they should have exactly the same kernel as the one that they get when installing the kernel RPM. > rday > > p.s. the 2.6 kernel comes with a config option to bury the config > file inside the actual kernel itself. IIRC, to get at that file, > you'd use a utility called extract-ikconfig. This option has to be enabled and currently is not, it is disabled by default due to the added size imposed when using it. Kernel .config support (IKCONFIG) This option enables the complete Linux kernel ".config" file contents, information on compiler used to build the kernel, kernel running when this kernel was built and kernel version from Makefile to be saved in the kernel. It provides documentation 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 and /proc/config_built_with, if enabled (below). /proc/config.gz will list the configuration that was used to build the kernel and /proc/config_built_with will list information on the compiler and host machine that was used to build the kernel. And Enable access to .config through /proc/config.gz (IKCONFIG_PROC) This option enables access to kernel configuration file and build information through /proc/config.gz. These options are under "General setup" when doing an make xconfig Hope this helps -- Douglas Furlong Systems Administrator Firebox.com T: 0870 420 4475 F: 0870 220 2178
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