What you may find...

Debian-arch alpha amd64 arm hppa i386 ia64 m68k mips mipsel powerpc s390 sparc
Kernel alpha x86_64, x86_64-em64t arm hppa, hppa64 486, 586, 686, x86_64, x86_64-em64t ia64 m68k r5k, r6k, r10k, r12k r5k, r6k, r10k, r12k powerpc, powerpc64 (G3, G4, G5) s390, s390x sparc, sparc64
Userland alpha amd64, i386 arm hppa i386 ia64 m68k mips mipsel powerpc s390 sparc
Endianess LE LE LE LE LE LE BE BE LE BE BE BE
Register size 64 (only 64) 64 (32 compat) 32 (64 kernel?) 32 (64 kernel) 32 (64 kernel if amd64) 64 (32 compat) 32 32 (64 kernel) 32 (64 kernel) 32 (64 kernel) 32 (64 kernel) 32 (64 kernel)