[yocto] What this Value

[Parthiban Kandasamy]

SRCREV_machine ?= "e1aa804148370cda6f85640281af156ffa007d52"

i don't know what is this value, this value found in

linux-yocto_3.10.bb
file. if i want to upgrade or downgrade kernel version should i change this
vale?

-- 
thanks and regards,
parthiban
      +919790329795
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