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Yes and No. AMD K6, K6-II and K6-III have an i586 (Pentium) compatible instruction set. Packages on the official CRUX ISO are compiled with -march=i686, which means that CRUX requires a processor which has an i686 compatible instruction set (i.e. Intel PPro/Celeron/PII/PIII/P4 or AMD K7/Athlon). However, Jürgen Daubert maintains an i586 version of the CRUX ISO image which can be found here. The i586 version of the CRUX ISO works on AMD K6/K6-II/K6-III.
This can happen if you have more than one CD-ROM drive. Make sure you boot from then "first" CD-ROM drive, i.e. /dev/cdroms/cdrom0. If you must boot from a different drive (i.e. not the first one) you can still do that but you have to type CRUX root=/dev/cdroms/cdrom1 at the boot prompt (cdrom1 indicates that it is the second drive, cdrom2 that it is the third, and so on).
You most likely forgot to enable devfs or didn't tell the kernel to mount devfs at boot. The installation instructions (Handbook Section 2.2, “Installing From CD-ROM”) tell you how to enable it.
You most likely forgot to edit /mnt/etc/fstab before you rebooted or you entered the wrong name of your new root partition at the boot prompt.