Re: How to select Kernel

This is a multi-part message in MIME format.

Hi,

Myself asked a few days ago:

> Is it possible to build T2-Head with a 2.4 linux kernel? Or an older 
> 2.6.x version? And if so, how do I go about it?

I tried deselecting the linux26 package and adding linux24 instead but
that apparently was not enough. T2 attempted to build a 2.4 kernel but
failed. I have not investigated that further as I really wanted a
2.6.18 kernel. The system I have been targeting is reported to work
with that version plus patches that I have.

So I first looked up the change history for base/package/linux26 and
found that a kernel newer than 2.6.18.x was introduced:

  svn log package/base/linux26 | less

And found it was in 21075:

  ------------------------------------------------------------------------
  r21075 | rene | 2006-11-30 11:27:37 +0100 (Thu, 30 Nov 2006) | 2 lines

        * updated linux26 (2.6.18.3 -> 2.6.19)

I then downgraded the packages linux-headers, linux24, and linux26 to
the revision immediately preceding this one:

  svn update -r 21074 package/base/linux-header
  svn update -r 21074 package/base/linux24
  svn update -r 21074 package/base/linux26

I then copied the patches, config-adaptations etc to my target.

  cp -r packages/base/linux-header target/kbox/package
  cp -r packages/base/linux24 target/kbox/package
  cp -r packages/base/linux26 target/kbox/package

I stole that idea from other targets. I then reran the
T2-Configuration, and ./scripts/Download -required.

And right, it downloads 2.6.18-stuff. Fine.

./scripts/Build-Target fails unfortunately:

> ..
> patching file include/acpi/acpiosxf.h
> patching file init/main.c
> You should not call uname during the build!
> Makefile:409: 
/home/kbox/t2/src.linux26.default.20080711.092946.29331.kboxdev/linux-2.6.18/arch/x86/Makefile: 
> No such file or directory
> make: *** No rule to make target 
`/home/kbox/t2/src.linux26.default.20080711.092946.29331.kboxdev/linux-2.6.18/arch/x86/Makefile'. 
 Stop.

The reason for this is simple: There is no arch/x86 in linux 2.6.18. It's
still arch/i386.

The T2-code that precedes the error-report is in 
package/base/linux24/linux-conf.in:

  # some arches (avr32, sh64 at the time of writing) have a "defect" Makefile
  # and do not work without a .config ...
  yes '' | eval $MAKE $makeopt oldconfig > /dev/null

$makeopt has ARCH=x86

So I also downgraded ./architecture as well. I ran ./scripts/Config again,
and switched the architecture for my build away from and back to x86.
Unfortunately that was not the case, the error persists.

What would be the T2-way of fixing this?

Ciao, MM
--
Marian Aldenhövel, Rosenhain 23, 53123 Bonn
http://www.marian-aldenhoevel.de
"I ran some quick calculations on it. He's about 80% on the right
 track.  That leaves him only 20% dead when he crashes." Bob C