In this case, "Architecture" refers to the computer platform the user wishes to deploy Debian on.

Here's a table describing the status of the various platforms.

Linux:

Chip

Manufacturer

Status

Comments

Alpha

?HewlettPackard (formerly Compaq, formerly Digital)

Supported

?StrongArm

Intel

Supported

Corel ?NetWinder, the ["CompaqIPAQHandheld"] , Sharp Zaurus

hppa

?HewlettPackard

Supported

HP Precision Architecture

["i386"]

Intel/AMD/Cyrix/...

Supported

The original platform

ia64

Intel

Supported

Itanium

m68k

Motorola

Supported

["Amiga"], ["AtariST"], old Macintoshes, some old Sun hardware (sun3)

mips

SGI

Supported

SGI Graphics Workstations run on this RISC chip

mipsel

Digital

Supported

Digital Decstations, little endian

["PowerPC"]

IBM/Motorola/Apple

Supported

Newer Macintoshes

s390

IBM

Supported

?BigIron - IBM mainframe platform

s390x

IBM

In progress

Newer ?BigIron - IBM mainframe platform

sh

Hitachi

In progress

?PlayStation

sparc

Sun

Supported

sun4

sparc64

Sun

In development

sun4u

x86-64

AMD

In development

Opteron

non-Linux:

hurd-i386

see TheHurd

In progress

Not a hardware platform

netbsd-i386

["NetBSD"] kernel

In progress

Not a hardware platform

netbsd-alpha

["NetBSD"] kernel

In progress

Not a hardware platform

freebsd-i386

["FreeBSD"] kernel

In progress

Not a hardware platform