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The AMD SB600 southbridge has an PATA IDE interface, but the
secondary port has no physical connections, so is disabled in
the PCI header which makes it appear as a legacy port.
On most systems this causes no trouble, but the Amigaone X1000 has
an SB600 connected to a PowerPC SoC PCI-e root port, with an
emulated ISA bus. On this system a kernel panic occurs at boot
time during device attach for the secondary port.
Mark the port as 'dummy' to prevent this. As a bonus, disabling
this will slightly speed up booting on PC systems using an
SB600 as they will now skip 2 known empty ports.
Signed-off-by: Darren Stevens <Darren@stevens-zone.net>
Signed-off-by: Tejun Heo <tj@kernel.org>