Since the low bits of a window's limit are hardwired to 1, this
configuration looks like a minimally sized window at address 0.
However, PCI resources are not generally at address 0 (see the
__PCI_VAR_ZERO_VALID macro that was only defined on sparc64), and some
PCI-PCI bridges report these register values after a reset. The
result today is a lot of spam in dmesg as the minimally-sized windows
fail to allocate. By ignoring these windows and treating them as
closed the end result is the same, but there is less spam during boot.
Reported by: jrtc27