Ports of Linux to different architectures. Please keep the architectures in alphabetical order, thank you.

68k

Motorola FAQs
links
linux-m68k.org

Alpha

Alpha on Google Directory

ARM

https://www.armlinux.org.uk/
ARM Linux developer - lots of docs & links
links
porting to ARM
StrongARM lots of docs & links
Cross-compile kernel for ARM(mini-howto)
Essential if you want to do assembly programming: ARM System Architecture, ISBN 0-201-40352-8, ADDISON-WESLEY, 1999
SA1110 Microprocessor Advanced Developers Manual
ARM assembler
documentation
http://www.ucdot.orgsome ARM and uClinux

Blackfin

Blackfin kernel porting project
Blackfin Open Source/Free Software Koop
GIT local changes, not pushed upstream yet

MIPS

Linux MIPS
MIPS PDA stuff

PowerPC

Apple: assember
discussion on SlashDot
Motorola semiconductors became Freescale and then NXP. https://www.nxp.com/ has lots of PowerPC info.

PA

Linux on PARISC

SuperH

Linux on SuperH

UserMode

http://user-mode-linux.sourceforge.net/

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Google Directory on Linux ports
linux_ports.html
Art of Assembly Language Programming - online textbook focussed on x86
Linux Assembly HOWTO
source for various ports
Some Linux 2.5.x Porting help