[yocto] Where does the 'PN' is set.

[Biao]

Hi,


In meta/conf/documentation.conf
PN[doc] = "PN holds the name of the package (Package Name). It is gathered from the bitbake-file filename"


I would like to know where does the so-called 'gather' exactly happens?
For example, does it mean the bitbake core get the 'PN = u-boot' by cutting of the name of 'u-boot_2011.03.bb'?


Thanks,
Biao 
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