Hi, I'm reserving a large number of buses in the UEFI-based BIOS by implementing the PCI hotplug protocol specified in PI. In the end the BIOS loads the Linux kernel directly using the x86_boot_stub feature in the new kernel. However before the kernel starts there is a pause for about 5 minutes with no output. I suspect somebody is enumerating all the PCI buses many of which are unused but reserved by BIOS. I guess it may be some cleanup code in BIOS or some initialization code in Linux. This pause also appears when I kexec into another kernel from the current kernel. Does anyone know where I should look at? Thanks!
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