Debian 2.7 spindle enabled at Debian bootup

This is probably nothing to do with LinuxCNC as such, as when the problem starts LinuxCNC isn't even running.

It sounds like the default outputs of the IO pins you are using are causing problems up to the point that LinuxCNC takes charge of them.

What interface are you using? If it is a parallel port (though you say you commented out the parallel port, so I am unsure) then you could try moving the spindle-on signal to one of the hardware-inverted pins.

comjon wrote:

Should the Debian build not have the spindle on signal disabled by default ?

Thanks.

It is disabled, in fact it has nothing to do with debian or linuxcnc. That is a hardware problem, namely parallel port was used to send diagnostic data during boot process on computers. If you do not have it connected through parallel port, the problem is in whatever interface you are using to control the spindle, not in debian or Linuxcnc.

comjon wrote:

Annotation: The Spinx1 powers up during the Debian 2.7 boot process "Synthesizing the initial hot plug events".

This probably indicates that the parallel port pins change state during boot. This is not something that LinuxCNC has direct control over.
It might be possible to avoid loading parport_pc, or some related module. It sounds like the problem is not during hardware boot, at least. Or it might suffice to switch the SPINX1 to a different parallel port pin with better behaviour.