[yocto] Defining group of machines

[Robert P. J. Day]

On Fri, 3 May 2019, Robert P. J. Day wrote:

> On Fri, 3 May 2019, Westermann, Oliver wrote:
>
> > We’ve a product group with different devices, each having their
> > machine-conf, eg
> >
> > Device_a
> >
> > Device_a_mini
> >
> > Device_b
> >
> > Device_b_mini <- Upcoming
> >
> > Device_c <- Upcoming
> >
> > Since device_a and device_a_mini share a lot of code, for them we
> > use one of the machine overrides, describing the processor family,
> > so I use RDEPENDS_${PN}_append_device_a if I just need it for
> > device_a and RDEPENDS_${PN}_append_am57x for device_a and
> > device_a_mini.
> >
> > Now I’m in the situation that device_c will use the same CPU as
> > device b, so I need something like a “group” of devices for family
> > b.
> >
> > How can I define a MACHINE_GROUP_device_b_group = “device_b
> > device_b_mini” so I can do
> >
> > RDEPENDS_${PN}_append_device_b_group or
> > do_install_append_device_b_group()?
>
>   i know i did this once upon a time using the MACHINEOVERRIDES
> variable to "insert" a machine family into the sequence of machine
> definitions. as long as there is (i believe) a strictly hierarchical
> grouping of machines you want to define, i'm pretty sure
> MACHINEOVERRIDES is what you want.
>
>   let me see if i can find where i did that once.

  yeah, i'm pretty sure you want MACHINEOVERRIDES:

https://www.yoctoproject.org/docs/latest/ref-manual/ref-manual.html#var-MACHINEOVERRIDES

which has a nice example of how to invent a new "machine" category
(qemuall) that subsumes a number of actual qemu machines. is that what
you were after?

rday

-- 

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Robert P. J. Day                                 Ottawa, Ontario, CANADA
                         http://crashcourse.ca

Twitter:                                       http://twitter.com/rpjday
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