There are 300mW class Linux-capable chips like SAMA5D27. 500Mhz Arm Cortex-A5.
There are all kinds of Linux Capable chips available between 0.3W to 5W, and with LPDDR1 or other older standards, you can get very good and cheap prices while still only sipping power.
There are all kinds of Linux Capable chips available between 0.3W to 5W, and with LPDDR1 or other older standards, you can get very good and cheap prices while still only sipping power.