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
PowerPC
Apple: assember
discussion on SlashDot
Motorola semiconductors became Freescale and then NXP. https://www.nxp.com/ has lots of PowerPC info.
PA
SuperH
UserMode
http://user-mode-linux.sourceforge.net/
Art of Assembly Language Programming - online textbook focused on x86
Linux Assembly HOWTO
source for various ports