Not even an error message. In case the pci core code assigns a ioAn error message and continue?Can Linux allocate resource for PCI(E) devices? How does it deal with the IO type?Yes. Details depend a bit on the specific configuration, but in general
window to the pci root port it will log a message saying so. In case
it doesn't it stays silent.
I don't know for sure. From the boot logs it looks like the kernelA more common case than the pci root bridge not supporting io addressDoes it have some certain policy that IO resource for first root bridge should
simply assigns resources in pci scan order, and when it runs out of
resources it stops assigning.