On Thu, May 01, 2014 at 07:37:10PM -0400, John Watlington wrote: > > On May 1, 2014, at 6:32 PM, James Cameron wrote: > > > On Thu, May 01, 2014 at 03:56:32PM -0400, Nathan C. Riddle wrote: > >> Found another Ralink device that works: RT5370. [...] > >> Now, is there a device based on Ralink chips to replace the internal > >> Libertas wireless module ? :) > > > > No, certainly not. > > ... > > And, if I'm reading the schematics right, there's also two voltage > > variants, so the modules for XO-1.5 (3.3V) can't be swapped with the > > modules for XO-1.75 and XO-4 (1.8V). > > Only cards built before we added the ESD protection (very early in > production) are limited to operation at +3.3V. Most of the cards used > in XO-1.5 operate at either +3.3V or +1.8V, and are identical to the > 88W8686 modules were used for XO-1.75 and XO-4.
Thanks. > > The XO-1.5, XO-1.75, and XO-4 main board wireless socket is a > > Mini-PCIe connector, but the electrical interface is custom, and > > carries SDIO, wireless indicator LED, and wakeup signals, so any > > new module must be custom made for the hardware. > > The miniPCIe form factor is frequently used for USB-based wireless cards as > well, and XO laptops do provide USB signals at the appropriate pins although > the shipped wireless card doesn't use it. I couldn't prove they were connected, on the XO-1.5 schematic (Rev M), as the signal name didn't appear elsewhere. They are tied to the USB hub on XO-1.75 and XO-4. > Power, ground, and some auxiliary signals use standard pins. > But we did reuse the actual PCIe signal pins to provide the SD interface > so you might need to cut some wires to avoid conflict. > The pinout is available at: > http://wiki.laptop.org/images/d/d9/XO_4_Pinouts.pdf Thanks. Are you aware of any replacement USB cards that have been made to work? -- James Cameron http://quozl.linux.org.au/ _______________________________________________ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel