[PATCH] serial: 8250: Make ISA ports optional

[One Thousand Gnomes]

On Mon,  5 Jan 2015 22:09:45 -0500
Peter Hurley <peter at hurleysoftware.com> wrote:

> Some arches have no need to create unprobed 8250 ports; these phantom
> ports are primarily required for ISA ports which have no probe
> mechanism or to provide non-operational ports for userspace to
> configure (via TIOCSSERIAL and TIOCSERCONFIG ioctls).
> 
> Provide CONFIG_SERIAL_8250_PHANTOM_UARTS knob to disable phantom port
> registration; ie., CONFIG_SERIAL_8250_PHANTOM_UARTS=N only registers
> probed ports (ACPI/PNP, "serial8250" platform devices, PCI, etc).

Just #define serial8250_isa_devs to 0 on such platforms. gcc should then
be bright enough to do the rest for you.