AM4 Ryzen Port problem: timer irq issue maybe?

Hello.

I've been working on porting coreboot to Asrock X370 Killer Sli/AC, and
I've made quite a lot of progress, and can even boot arch linux off usb
from either seabios or tianocore.

However, there's a number of odds and ends that need to be fixed which
will require a lot of build/flash/boot cycles to wholly figure out.
Problem is, the act of booting linux in my board's current state is an
absolute chore to perform.

After grub loads the kernel and initramfs, it goes quite smoothly for a
while, but at some point, it slows to an absolute crawl/almost halts
entirely. I've found that by plugging and unplugging a usb keyboard it
causes the boot to progress a bit more each time, until it gets to the
point where getty@ttyS0 comes up and sshd is running. Once ssh'd in, I
can basically use it just like it was the vendor firmware, a few
outstanding issues notwithstanding. This slowing/halting of boot also
occurs if I issue a shutdown command and requires the same plug/unplug
manipulation to make it actually finish.

It has been suggested to me in a few places that its a lack of a timer
irq getting through, but I'm not certain that's actually it but its the
only lead I have to go on right now. My current state of code is at:
https://review.coreboot.org/c/coreboot/+/77879 and is largely based off
the zork chromebooks and the mandolin devel board's code. As I can see
no particular handling of timer irqs in either I'm at a loss as to what
could be the missing piece of the puzzle.

Once I can build/flash/boot a bit faster I'm almost certain I can get
the usb ports coming off the x370 chipset working (pcie and sata both
appear to be fully functional as of this moment, more testing required)
but as mentioned, it is *such a painful process* to actually boot linux
on it in its current state.

Any suggestions or solutions greatly appreciated.

Regards,
Marty
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