On Mar 12, 2007, at 10:15, Jim Perrin wrote:
3. After copying the config file an making one small
change with "make xconfig", why are there so many
differences in the config file?
Are they actual changes, or is the diff now simply off by a few lines?
I went back and started the process of building a kernel from scratch
on a different system. This time I paid closer attention to what was
going on. After the "rpmbuild -bp --target=`uname -m`
kernel-2.6.spec" step, the ~/rpmbuild/BUILD/kernel-2.6.9/linux-2.6.9
directory contains among other things these two files:
-rw-r--r-- 1 rpmbuild rpmbuild 50332 Mar 12 15:32 .config
-rw-r--r-- 1 rpmbuild rpmbuild 61600 Mar 12 15:31 .config.old
Notice the size difference of these two files. After copying the
config file from the ~/rpmbuild/SOURCES directory, these two files
now look like this:
-rw-rw-r-- 1 rpmbuild rpmbuild 61600 Mar 12 15:42 .config
-rw-r--r-- 1 rpmbuild rpmbuild 61600 Mar 12 15:35 .config.old
And a diff confirms the the two files are now identical. However,
after doing a "make xconfig", changing two settings in the Serial
Port section and saving the config file, the directory looks like this:
-rw-rw-r-- 1 rpmbuild rpmbuild 50322 Mar 12 15:44 .config
-rw-rw-r-- 1 rpmbuild rpmbuild 61600 Mar 12 15:42 .config.old
Finally, comparing the new .config file with the original .config
file only shows the expected changes:
# diff /tmp/saved_configs/.config .config
4c4
< # Mon Mar 12 15:32:01 2007
---
> # Mon Mar 12 15:44:32 2007
1501c1501
< CONFIG_SERIAL_8250_NR_UARTS=4
---
> CONFIG_SERIAL_8250_NR_UARTS=16
1503c1503
< # CONFIG_SERIAL_8250_MANY_PORTS is not set
---
> CONFIG_SERIAL_8250_MANY_PORTS=y
While I don't quite understand what is going on, it appears that
xconfig is doing the right thing. I'm rebuilding the kernel again as
I type this. BTW, there are lots of compiler warnings: is this
normal/expected for a kernel build?
Alfred
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