I'm taking apart a Pogoplug_V4_A1_V3.1, and I noticed this trace in a corner of a board, connected to the Marvell 88F6192 processor:
The trace itself is approx. 0.2Ω, and the resistor is approx. 0Ω. They are connected to pin 158 & 155, aka
M_STARTBURST_IN. According to the documentation:
88F619x indication of starting a burst read transaction. Asserted with the first M_CASn cycle of SDRAM access. NOTE: Must be routed on board to the SDRAM, and back to the 88F619x as M_STARTBURST_IN. For the recommended length calculation for this routing and termination requirements, see the 88F6180, 88F6190, 88F6192, and 88F6281 Design Guide.
This is interesting, because it's not connected to the SDRAM, it just goes in a big loop.
What is the purpose of this thing?