Great! Thank you Paul! I didn't get the "Variable_$machine" part from the documentation.
One Question: I want to add changes to a %MACHINE.conf via my layer (to be specific: I want to add "APPEND += "video=LVDS-1:d" to meta-intel/meta-chiefriver/conf/machine/chiefriver.conf) Is this also possible via a separate layer? Once again, I didn't find out via the documentation. ATM I have to modify the chiefriver.conf directly :-( Thank you for your help so far, Regards, Felix Paul Eggleton <[email protected]> schrieb am 24.09.2013 10:52:00: > Von: Paul Eggleton <[email protected]> > An: Felix01 Fischer <[email protected]>, > Kopie: [email protected] > Datum: 24.09.2013 10:52 > Betreff: Re: [yocto] Is it possible to add machine specific changes > in a separate custom layer? > > Hi Felix, > > On Monday 23 September 2013 18:40:19 Felix01 Fischer wrote: > > My goal is to build a custom-layer which supports 2 devices building on > > top of the meta-intel and meta-ivi layer without changing anything except > > my meta-custom layer. > > > > Is it possible to have machine specific changes in a separate layer > > building on top of another layer? > > I want to costumise meta-intel/meta-crownbay and > > meta-intel/meta-chiefriver without changing something inside the > > meta-intel layer. > > My goal is to have modifications for the meta-intel layer in a meta-custom > > layer, which only get considered if a certain MACHINE ?= "XXXX" (crownbay > > or chiefriver) from the meta-intel layer is set. > > Is this possible? > > This is definitely possible - the key is to make use of bbappends and machine > overrides. Append files are covered here: > > http://www.yoctoproject.org/docs/current/dev-manual/dev- > manual.html#using-bbappend-files > > Overrides effectively make an assignment statement apply only when the > specified override appears in the value of the OVERRIDES variable. For > example: > > VARIABLENAME = "the default value" > VARIABLENAME_crownbay = "value specific to crownbay machine" > > You can use append/prepend to add to the variable value instead of just > setting it: > > ANOTHERVARIABLE_append_chiefriver = " appended only for chiefriver" > ANOTHERVARIABLE_prepend_crownbay = "prepended only for crownbay " > > By default, the value of OVERRIDES includes the value of MACHINE, DISTRO, etc. > If you run bitbake -e | less and then search (with /) for OVERRIDES= you can > see how how OVERRIDES is constructed. > > > I have the same question regarding DISTRO. I want some changes to be > > considered if DISTRO = poky and some other changes when DISTRO = > > poky-ivi-systemd. > > Same as above only you'd be using the distro name as the override e.g. > > SOMETHING_append_poky = " whatever poky-specific additions are needed" > > > Is it possible to maintain these modifications in ONE custom layer or do I > > need to have seperate layers (one for poky, one for poky-ivi-systemd and > > machine specific changes inside the meta-intel layer)? > > You don't have to, but generally we recommend keeping the machine > customisations separate from policy (distro) customisations. This can make > things easier if you have to change the machine later. > > Cheers, > Paul > > -- > > Paul Eggleton > Intel Open Source Technology Centre
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