On Tue, 2007-09-18 at 15:33 -0400, Richard A. Smith wrote: > John Watlington wrote: > > > While it makes sense to turn off the wireless networking interface on > > developer > > So there's a slight problem with powering off the wireless interface > from an electrical standpoint. You can't. > At least not if you want a working system. > > WLAN_EN controls WLAN_3.3V. +3.3V is derived from WLAN_3.3V. So if you > drop WLAN_3.3V you lose +3.3V and you also lose: > > VDDIO on the LX700 > Pullups on the PCI bus. > Pullups on the jtag lines > Supply voltages for COREPLL, GLPLL, and DOTPLL on the LX700 > Power supply to the LX700 Therm alarm circuits > Power supply to the system clock chip. > > And lots of other stuff...you get the idea. System no workie. > > That leaves 3 alternatives: > > 1 Don't load the wlan firmware. > 2 Load the firmware and tell wlan xmit to shutdown > 3 Hold the WLAN module in reset. > > #3 Can be done via the EC but there's currently not a command to _hold_ > it in reset. There is a reset WLAN command which will strobe the reset > line for 1ms. I can add enable/disable reset commands if 1 and 2 are > not viable.
1 and 2 are certainly viable and should be the preferred methods I think. Note that right now trying to rmmod usb8xxx panics the kernel for some reason. Dan _______________________________________________ Devel mailing list [email protected] http://lists.laptop.org/listinfo/devel
