Now i got it.
Bitbake handles the variable TOPDIR, LAYERDIR internally. 

Thanks anyway,
Biao



At 2012-12-17 17:06:26,Biao <huanmat...@163.com> wrote:

Greetings, 


I am a newbie tying to understand how bitbake works.
There is one line as BBPATH = "${TOPDIR}" in the mybuild/conf/bblayers.conf, i 
would like to know where the TOPDIR is defined? 


Thanks,
Biao
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