I got the following:
$this->bbcode_second_pass_code('', '[root@Arch Linux ARM install ~]# pacman -S udev-automount
resolving dependencies...
looking for inter-conflicts...
Targets (1): udev-automount-1.0-2
Total Download Size: 0.00 MB
Total Installed Size: 0.02 MB
Proceed with installation? [Y/n] y
(1/1) checking package integrity [######################] 100%
(1/1) checking for file conflicts [######################] 100%
error: failed to commit transaction (conflicting files)
udev-automount: /etc/udev/rules.d/11-media-by-label-auto-mount.rules exists in filesystem
udev-automount: /etc/udev/rules.d/11-sd-cards-auto-mount.rules exists in filesystem
Errors occurred, no packages were upgraded.')
This was before and after a Pacman -Syu. All I skipped was a kernel26 --> linux/core replacement.