[oe] How does OE determine the kernel version that gets build?

[Lars Holowko]

Hi everybody,

I am working with an Atmel AT91SAM9G20-EK evaluation board. I was able
to successfully build the console-image and the default 2.6.28 kernel
for it.

Now I want to switch to a 2.6.30 kernel (for better wireless support)
but bitbake linux or bitbake console-image always builds 2.6.28 instead.
I copied a defconfig to recipies/linux/linux-2.6.30/at91sam9g20ek,
copied the AT91 patches for 2.6.30 in its place and added a
DEFAULT_PREFERENCE_at91sam9g20ek = "30" line to
recipies/linux/linux_2.6.30.bb hoping to make the 2.6.30 kernel active.

I can build a running kernel 2.6.30 with bitbake -b
recipies/linux/linux_2.6.30.bb.

Funnily there is no DEFAULT_PREFERENCE_at91sam9g20ek line in
recipies/linux/linux_2.6.28.bb and its DEFAULT_PREFERENCE = "-1" so I do
not even understand why that kernel gets chosen at all.

Looks like kernel version that gets build is determined somewhere else.
Can anyone point me to a document that describes how versions really get
determined? Adding a couple of -D -D -D -D did not really help. I see a
line

DEBUG: selecting
/old/OE-current/openembedded/recipes/linux/linux_2.6.28.bb as
PREFERRED_VERSION 2.6.28 of package linux (for item
kernel-module-zd1211rw)

in the log but then I do not understand why kernel-module-zd1211rw
triggers the 2.6.28 kernel. 'zd1211rw' hardly appears in any recipes :-(


Any hint would be highly appreciated.


Lars
 
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