A small number of XO 1.5 B1 boards have arrived and are in hardware testing. The Quanta team, working in secret, decided that the B-phase risk was too high to do in a single run and built a B1 motherboard. The availability of plastic for B-phase was delayed due to complications from minor modifications to tooling still being using for production, providing the opportunity.
A small number of these B1 motherboards were fabricated in Shanghai, and simultaneously shipped to both Taipei and Cambridge. These boards have a number of problems, but allow us to test the fixes applied for suspend/resume and SD interface problems. They both seem to be fine after a few days of testing on 14 bare motherboards. Thanks to the efforts of Paul, Mitch, and Richard, we have OFW and Linux which support these prototypes. More details about the motherboards are available at: http://wiki.laptop.org/go/XO_1.5_B1 We have to fix a number of problems, make schematic and board changes, and approve the B2 board layout by next Wednesday night (EDT) in order to stay on schedule. I spent a day last week working on a new interface to Tinderbox (as well as adding twenty more power measurements channels, diggging into where +2.5V and +5VSUS was going...) The new interface, illustrated at: http://dev.laptop.org/~wad/xo1.5pwr/test3.html presents the Tinderbox measurements in the context of the power distribution tree, without having to import them into a spreadsheet (the previous approach). Richard has long suspected that the inductor value in the XO backlight is too low. I finally got around to measuring the efficiency of the backlight using different inductor values, and we can improve it from around 88% to 95% by changing the value. This saves upwards of 50 mW, even in suspend! The table of measurements is available at: http://dev.laptop.org/~wad/xo1.5pwr/backlight.html Cheers, wad _______________________________________________ Devel mailing list [email protected] http://lists.laptop.org/listinfo/devel
