[oe] why PREFERRED_PROVIDER_virtual/kernel in conf/machine/sun4cdm.conf does not work

[Guo Hongruan]

Hi guys,
   I tried to build an openembedded project with the following setting:
MACHINE=sun4cdm  DISTRO=micro LIBC=eglibc
But I noticed the following warning message after parsing the bb files:

NOTE: multiple providers are available for virtual/kernel (linux-palmpre,  
linux-rt, gumstix-kernel, linux);
NOTE: consider defining PREFERRED_PROVIDER_virtual/kernel
NOTE: Preparing runqueue
NOTE: Dependencies saved to 'depends.dot'
NOTE: Task dependencies saved to 'task-depends.dot'

My question is:
In the conf/machine/sun4cdm.conf, there is the defination of  
PREFFERRED_PROVIDER_virtual/kernel, see the following line:
REFERRED_PROVIDER_virtual/kernel = "linux-sun4cdm"
Why did it not work at all?

Anyone can give me some hints?

Thanks a lot!

-- 
Guo Hongruan, Embedded Linux Consultant
Skype: camelguo
Twitter: camelguo
http://www.gulessoft.com