I've shipped a product with a Cortex-M3 running ucLinux. Designs considerations included cost, of course. A comparable A series part would usually be double t

I've shipped a product with a Cortex-M3 running ucLinux. Designs considerations included cost, of course. A comparable A series part would usually be double the price. RAM is also built into the part or attached via a low speed or parallel interface. Once you get into higher speed A parts, you'll need DDR and all the multi-layer PCB design work that goes with it. More cost. There was also development speed. I could use drivers and filesystems from the Linux tree without much extra work. I also recommend the EmCraft ports, they do great work.