Re: wiki howto on custom kernel

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On Mar 12, 2007, at 14:43, Johnny Hughes wrote:

My ISP must have been having some problems yesterday, because replies to my last post arrived up to 8 hours before my post. So thanks for all the responses, and sorry for not replying sooner.

You can put the /rpmbuild directory anywhere you want ... edit
the .rpmmacros file in the "builder user's" home directory and adjust
the the %_topdir to where you want to build ... mine looks like this:

%_topdir        /home/hughesjr/rpmbuild

Make sure the "build user" has rw permissions in the rpmbuild dir.

Great, thanks. I worked around this be creating a local rpmbuild account.

Did you do "make oldconfig" with the old config file?

Nope, I just followed the instructions in the CentOS HowTo.

you might also want to ensure you are using the correct target and
arch .. I do this:

rpmbuild -bp --target i686 kernel-2.6.spec

the go to the linux directory under BUILD ... and copy the
configs/kernel-xxxx.config file into .config

That's exactly what the HowTo says to do.

If this is C4 .. you can take that .config file that you saved and move
it directly into SOURCES to use (replace the current one of that
type ... OR name it something else and modify the spec file to use the
new name as a source).

Again, the HowTo mentioned this as well. The part that confused me is that running make menuconfig (or xconfig) starting with the config file copied from the SOURCES directory produces a very different config file (as shown by diff). But it turns out that this config file is identical to the original config file in the BUILD directory except for the changes made during the menuconfig/xconfig. So what is the use in copying the config file from the SOURCES to the BUILD directory?

If this is C5 (or FC5/6) you will need some stuff added to the top of
the config file to get it to work ... but on C4, you can use the config
directly from make menuconfig (xconfig) as a kernel config file.

I will probably have to rebuild the kernel again after CentOS 5 is released to enable support for the additional serial ports, unless this is already the default in the new kernel. And if there are some things that need to be added to the config file in C5, I'm sure that the Wiki HowTo gets updated (you guys do a great job -- thanks!).

Alfred

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