In the following, a number of frequently asked questions (FAQ) and their answers are presented. This may answer some of the questions you have and may also help with troubleshooting.
Which devices are supported?
With the exception of the Qube 2700 (Qube 1), all MIPS based Cobalt devices are supported. This includes the Gateway Microserver and the Cobalt RaQ1, Qube2, and RaQ2.
Will this installation procedure also work on RaQ3/RaQ4
No, the installation system described here will only work on MIPS based Cobalt machines, i.e. RaQ1, Qube2 (Qube 2800) and RaQ2. As far as I know, there is no Debian installer that will simply work on those machines.
Is there an installation routine like NetBSD offers?
Apparently NetBSD has a CD-ROM which you can put in a PC and then a Cobalt connected to this PC will automatically be installed. This is also how the installation of the old Cobalt OS worked. I don't plan to support this. However, debian-installer allows you to do fully automated installations and you could use that instead.
Can I put a bigger hard drive in my Cobalt?
Generally, yes. I have had reports from people successfully using a 160 GB in their Cobalt. However, there may be some Cobalt machines with a very old firmware that have a limit of 30 GB. I'm not really sure whether this restriction exists on some machines though.
What PCI cards can I put in my Qube?
The Qube2 has a PCI slot in which one PCI card can be put. Generally, most PCI cards should fine and the kernel supplied with Debian includes modules for a number of cards. However, please be aware that there is not terribly much space in the Qube so big PCI card will not fit. I've heard from people successfully using USB, SCSI and sound cards in their Qube.
Where can I find more information regarding Linux on Cobalt?
The Linux/MIPS project maintains a wiki which has a page with Cobalt related information.