Update 2019-05-21 19:37 EST: My motherboard is on the latest BIOS available, released 2019-03-06, but still has the install problems described below.
Update: I burned the Arch ISO to a CD then tried booting from it, both in UEFI and legacy. Same type of result:
Original question: I used dd
to put this Arch ISO (Version 2019.05.02) on a USB stick, then attempted to boot from it on my desktop computer. When the Arch menu comes up, I choose "Boot Arch Linux (x86_64)." But what follows is a bunch of error messages, then the process just hangs there doing nothing. Here's a pic:
The messages start off as "AMD-Vi: Completion-Wait loop timed out"
The messages include "kernel panic."
My motherboard is an MSI B450 Tomahawk with a Ryzen 5 2600 CPU. I've tried booting via UEFI and legacy with the same result.
How do I install Arch Linux?
Best Answer
Linux Kernel With MSI B450
The kernel fail in this case because of the support of the iommu feature; you can use some specific kernel adjustment (parameter) to fix your booting issue, this video demonstrate how to edit/apply the kernel parameters; here are some possibles solutions, try the different proposed parameters and choose the one that match best your needs. also you may turn off SVE in the bios.
Possible Solutions: Kernel Parameters
iommu=off
iommu=off
andamd_iommu=fullflush
amd_iommu=off
mem_encrypt=off
amdgpu.runpm=0
pci=noats
Involved Technology Definition
Kernel Parameters: (aka Boot Options) Kernel command line parameters are parameters that you pass on to the kernel during the boot process to adjust its features or capabilities.
IOMMU: is a memory management unit that basically increase performance and security; additional details can be found here
IOMMU State: on, off or fullflush (detail on the linked article)
mem_encrypt: Add support for Secure Memory Encryption (SME). and defines the memory encryption mask that will be used in subsequent patches to mark pages as encrypted.
amdgpu.runpm=0: disable the graphical power management in the linux kernel (it will be then handled at the hardware/firmware/bios level)
pci=noats: disable PCI Address Translation Services
Note
After the install you will need to be very careful on kernel updates
Advanced technical users may build their own kernel with this or that patch
Arch Boot Disk:
To apply the parameters to the boot disk, on the boot menu, push "tab" to edit the boot command, hit space (to add a space) then write the parameter for instance "iommu=off" without quotes then hit enter to boot
Sources:
launchpad, freedesktop, freedesktop, freedesktop, askubuntu, wikipedia, artofcode, archlinux, linuxfoundation, fclose, youtube, youtube