ARM's first explosion was in PDAs, not running Linux. SA110 and XScale.
A ton of ARM hardware is embedded cores running VxWorks or EmBed. M0 through M4. Yes, Phones are the dominant core consumer here, but there is a whole bunch of embedded/IoT stuff shipping ARM cores every day that will never see Linux installed.
A ton of ARM hardware is embedded cores running VxWorks or EmBed. M0 through M4. Yes, Phones are the dominant core consumer here, but there is a whole bunch of embedded/IoT stuff shipping ARM cores every day that will never see Linux installed.