There are three aspects to define a hardware revision: the Fab, the Assembly, and the Lot. Every Gumstix COM and expansion board carries a white label with identification numbers to allow tracing of the build version and manufacturing history of that product.
The Fab Number
The "Fab" is the word Gumstix uses to name a particular "bare PCB" and the "Fab number" corresponds to one product type. For example, all Summit expansion boards have the Fab Number PCB30001 printed on the board in ink when the Fab was created. They also have a Revision number immediately following the PCB30001, such as -R2450
Fab numbers of Gumstix COM boards start with "PF"
- e.g. PF3503-R2606 defines bare PCB version 2606 of an Overo COM (PF3503)
Fab number of Gumstix Expansion boards start with "PCB"
- e.g. PCB30005-R2467 defines bare PCB version 2467 of a Chestnut expansion board (PCB30005)
Note that one or more products may be built on the same fab, depending upon which assembly (bill-of-materials) is used in manufacturing; e.g. two products with the same PCB layout and different component populations.
Assembly and Lot Codes
An Assembly describes a particular populated PCB and the Assembly number corresponds to one bill of material populating each of the different reference locations on the bare PCB. As of July 2010, Gumstix has requested that its manufacturers label every assembled board with a small white sticker carrying the following information:
- the Assembly number
- COMs begin with "GS" e.g. GS270B-XM4-R2635 defines assembly version 2635 of a verdex pro COM (GS270B)
- Expansion boards begin with "BRD" e.g BRD30001-R2563 defines assembly version 2563 of a Summit expansion board (BRD30001)
- the Lot number defining the particular work-order (build) of the specific assembly e.g. W/O #69217
- the Date code to define the date of assembly of that specific board --- e.g. "BT-10-26" to define the manufacturer code ["BT"] and year ["10"] and week of the year ["26"].
Note that some vendors have chosen alternative forms of the date code to correspond to their own manufacturing process, or to append their internal work-order number as well.
Product Features and Functions
To know what function is shipping on any particular Gumstix product, review the "Features" information as presented on the product page at www.gumstix.com rather than depending upon the function designed into the schematic posted in pubs.gumstix.com. Gumstix makes this recommendation because function designed on to a Gumstix board (as per schematic) may or may not be populated during the build process.
Keep-outs and Height Restrictions for a Custom Expansion Board
Layout information has been posted for the Overo COMs in the COMs section of pubs.gumstix.com.
This information defines the board outline, connector positions, and keep-out areas. Components placed under the COM outside the keep-out areas should be limited to 1.2mm height.
40-pin and 60-pin Headers
For signal and pin number information of the headers available on the Overo expansion boards, go to the sections linked below.
The 40-pin and 60-pin header, posted online in the two sections linked below, should be considered accurate if there is a difference when compared to the information of a schematic posted at pubs.gumstix.com or any labelling on an expansion board..