• Otavio Salvador's avatar
    fsl-default-providers.inc: Make virtual/kernel assigment delayed · 3f2f08fe
    Otavio Salvador authored
    In 01851da (machine/*: Allow kernel provider override) the assigment
    of preferred provider for virtual/kernel has been changed to a weak
    assignment. This works for most of cases but has caused a regression
    in some machines.
    
    When a machine includes the imx-base.inc file, the assignment is done
    and the intended setting of the machine does not take effect.
    
    For example, in the below code fragment:
    
    ,----[ Wandboard board configuration fragment  ]
    | include conf/machine/include/imx-base.inc
    | ...
    | PREFERRED_PROVIDER_virtual/kernel ?= "linux-wandboard"
    `----
    
    the virtual/kernel provider would be 'linux-imx' as, at the time of
    imx-base.inc inclusion, it was undefined. The expected behaviour would
    be to use 'linux-imx' /only/ when no setting has been done.
    
    The ??= operator solves this as it is used /only/ if no assignment is
    done to the virtual/kernel provider in the end of the parsing. So it
    gives the expected behaviour.
    
    Change-Id: Iab73dcff8bef7f2df1064a0d5d04fd506a4c3144
    Reported-by: 's avatarAlfonso Tamés <alfonso@mantic.mx>
    Signed-off-by: 's avatarOtavio Salvador <otavio@ossystems.com.br>
    3f2f08fe
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