[ECOS] "!!!-- Configuration broken - no scheduler selected --!!!"

[Erik Christiansen <erik at dd dot nec dot com dot au>]

That straighforward error message occurs several times, deep in my ecos.ecc,
but is CYGSEM_KERNEL_SCHED_MLQUEUE not enabled here?:

cdl_component CYGSEM_KERNEL_SCHED_MLQUEUE {
    # Flavor: bool
    # No user value, uncomment the following line to provide one.
    # user_value 1
    # value_source default 
    # Default value: 1

    # The following properties are affected by this value
    # option CYGPRI_KERNEL_SCHED_IMPL_HXX
    #     Calculated:   CYGSEM_KERNEL_SCHED_BITMAP  ? "<cyg/kernel/bitmap.hxx>"  : CYGSEM_KERNEL_SCHED_MLQUEUE ? "<cyg/kernel/mlqueue.hxx>" : CYGSEM_KERNEL_SCHED_LOTTERY ? "<cyg/kernel/lottery.hxx>" : "!!!-- Configuration broken - no scheduler selected --!!!"
    # component CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL
    #     ActiveIf:  CYGSEM_KERNEL_SCHED_MLQUEUE
    # option CYGIMP_UITRON_STRICT_CONFORMANCE
    #     Requires: CYGSEM_KERNEL_SCHED_MLQUEUE
};

cdl_option CYGSEM_KERNEL_SCHED_BITMAP {
    # Flavor: bool
    # No user value, uncomment the following line to provide one.
    # user_value 0
    # value_source default
    # Default value: 0
    # Requires: !CYGPKG_KERNEL_SMP_SUPPORT
    #     CYGPKG_KERNEL_SMP_SUPPORT == 0
    #   --> 1

    # The following properties are affected by this value
    # option CYGPRI_KERNEL_SCHED_IMPL_HXX
    #     Calculated:   CYGSEM_KERNEL_SCHED_BITMAP  ? "<cyg/kernel/bitmap.hxx>"  : CYGSEM_KERNEL_SCHED_MLQUEUE ? "<cyg/kernel/mlqueue.hxx>" : CYGSEM_KERNEL_SCHED_LOTTERY ? "<cyg/kernel/lottery.hxx>" : "!!!-- Configuration broken - no scheduler selected --!!!"
    # component CYGSEM_KERNEL_SCHED_TIMESLICE
    #     Requires: !CYGSEM_KERNEL_SCHED_BITMAP
};

Since ecosconfig thinks that the configuration is OK;

$ ecosconfig check
Adder
Template: kernel
Added:
 CYGPKG_UITRON
Removed:
 CYGPKG_IO_SERIAL
 CYGPKG_HAL_QUICC
 CYGPKG_IO_SERIAL_POWERPC_QUICC_SMC
No conflicts

and the code built from this does schedule threads, I'm led to infer
that CYGSEM_KERNEL_SCHED_MLQUEUE is active by default. But then the
configuration is not broken!?

No benefit is obtained from trying:
   a) Uncommenting the "# user_value 1" in CYGSEM_KERNEL_SCHED_MLQUEUE

   b) ecosconfig add CYGSEM_KERNEL_SCHED_MLQUEUE

   c) ecosconfig remove CYGPKG_UITRON

Is there some other measure that can make this situation less scary?

Erik

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