Selection of RISC architecture
I'm new to the RISC scene, recently playing around with a Marvell Sheevaplug which was way too powerful for the projects I was playing with:
bluetooth pager/mobile phone advertising
(Next I'm just going to add a USB VGA card to it and use it as a carputer)
What it did do however was get me hooked on more efficient ways of providing services on a network using headless embedded devices.
I've been looking for a new board for my next project, a firewall/proxy/web/email server. But there is so many selections on the market when it comes to RISC architecture...ARM, PPC, MIPS appear to be the most commonly available.
Is there a rule of thumb when it comes to choosing architecture? Is there a comparison chart for architecture and clock rates to "computing power"?