On Tue, Oct 25, 2016 at 8:26 AM Stephane Charette < stephanechare...@gmail.com> wrote:
> On Friday, September 9, 2016 at 1:06:21 PM UTC-7, Stephane Charette wrote: > > When I first plug power into my BBGW, everything works great. But if I > issue a "reboot" or "shutdown -r now" command, when the device boots back > up I have no wifi. > > > > This morning, TI finally replied to me on their forum in regards to this > ongoing wifi problem. While I understand the meaning in the message, I > don't have the skills to know what to do with this information. Here is > what they had to say: > > I believe we have found the root cause for the BBGW wifi related issues. > Bottom line is that BT_AUD_OUT from wl1835 has to be pulled low when WL_EN > is activated. > in case it isn't, wilink8 ends up in one of the test modes that introduces > various issues (elp wakeup timeouts etc.) > On the BBGW this pin is routed through the level shifter (U21) that > introduces a pullup on the line and wilink8 ends up in a bad state. > To work around this, I have used a gpio hog to force this pin low. > An alternative may be adding an external pulldown on U21 pin 4 but this > would require an ECO. > > Please see section 10.4 in the following document: > http://www.ti.com/lit/ug/swru437/swru437.pdf > > You can see that AUD_OUT_BT has to be 0 when BT or WLAN enable bit is set > to high. > > BR, > Eyal > > Note that Robert has already incorporated the recommended work-around from the TI WiFi team: https://github.com/RobertCNelson/dtb-rebuilder/commit/a0c693246e1abcbb3ed58f5a7319c6250416736c > > > Stéphane > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to beagleboard+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/d19a8a29-f559-4cdd-ac09-3187eafa1f78%40googlegroups.com > <https://groups.google.com/d/msgid/beagleboard/d19a8a29-f559-4cdd-ac09-3187eafa1f78%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CA%2BT6QPk7tSyxBZk1WOGHes3Om81GWHf9aLHWakdpRwg5r2Q2nA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
