Date: Sun, 4 Feb 2018 10:02:57 +0900 (JST) From: Mori Hiroki <yamori813@yahoo.co.jp> To: Shamim Shahriar <shamim.shahriar@gmail.com>, "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: Adding a GPS Module (hat/shield) on a Raspberry Pi Message-ID: <473466.66842.qm@web101709.mail.ssk.yahoo.co.jp> In-Reply-To: <fb0e6260-a526-fd29-2a36-d474b8022eac@gmail.com> References: <fb0e6260-a526-fd29-2a36-d474b8022eac@gmail.com>
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Hi=0A=0AI use GPS module on RT3050(mips).=0A=0AI consider solution at=A0ser= ial port for not conflict u-boot.=0A=0Ahttps://translate.google.com/transla= te?sl=3Dja&tl=3Den&js=3Dy&prev=3D_t&hl=3Dja&ie=3DUTF-8&u=3Dhttps%3A%2F%2Fqi= ita.com%2Fyamori813%2Fitems%2F54d6b1a8b7d0e3be6c07&edit-text=3D=0A=0A=0A---= -- Original Message -----=0A> From: Shamim Shahriar <shamim.shahriar@gmail.= com>=0A> To: freebsd-arm@freebsd.org=0A> Cc: =0A> Date: 2018/2/3, Sat 20:15= =0A> Subject: Adding a GPS Module (hat/shield) on a Raspberry Pi=0A> =0A>G = ood morning all=0A> =0A> I had been searching for a solution for the last 3= days, and tried various =0A> different things based on the google results,= but so far no luck. Hope someone =0A> from the list can shed some light an= d maybe point me to the correct direction.=0A> =0A> Here is the scenario:= =0A> =0A> Device: Raspberry Pi B (pi 1 model b, the 512M RAM version, or mo= re precisely =0A> v1.2)=0A> GPS Module : Ublox hat that sits perfectly on t= he Pi, with PPS on GPIO-18=0A> FreeBSD version: 11.1 RELEASE for RPI-B=0A> = =0A> As I understand, the serial ports on the GPIO is activated by default,= and if I =0A> attach "ONLY" a serial console (USB to serial), I can intera= ct with =0A> the Pi through the console. Remove serial console cable, attac= h the Pi to a =0A> display (via HDMI), boot it up -- it works just fine.=0A= > =0A> If now I add the GPS module/hat/shield, all I get is series of dots = (depending =0A> on how soon the GPS finds the satellites and starts sending= the data) and the Pi =0A> does not boot at all.=0A> =0A> Based on=0A> http= s://forums.freebsd.org/threads/59485/=0A> https://lists.freebsd.org/piperma= il/freebsd-arm/2017-March/015845.html=0A> https://vzaigrin.wordpress.com/20= 14/12/13/liberation-of-the-serial-console-in-the-freebsd-on-the-raspberry-p= i/=0A> =0A> I have managed to get to the point where I can see that if I ha= ve only the =0A> serial console cable attached, it stops interacting with t= he boot process after =0A> a while (the boot continues, and I can see that = on the HDMI output). But that =0A> also stops interacting with whatever sig= nal is being sent via that console).=0A> =0A> And if I attach the GPS modul= e now, it refuses to boot and drops me to a =0A> loader> prompt=0A> =0A> My= understanding (and I might be very very wrong) is, the u-Boot system is no= w =0A> being affected and hence cannot boot.=0A> =0A> I am not new to FreeB= SD, had been using it since the 4.4BSD Lite days, but I am =0A> seriously b= affled by how difficult (nearly impossible) it had been to get rid of =0A> = the serial console (something so easy and taken for granted on the i386 or = other =0A> similar architecture). One of the links I found =0A> (https://ww= w.cryptomonkeys.com/2014/01/freebsd-raspberry-pi-gps-ntp/) even =0A> sugges= ted that I need to create custom image to get PPS working. Well, working = =0A> PPS comes *after* being able to boot the device with the GPS hat/modul= e/shield =0A> on -- and I am still stuck at that level.=0A> =0A> Any help/p= ointer/suggestion/direction in this respect is greatly appreciated.=0A> =0A= > Best regards=0A> =0A> _______________________________________________=0A>= freebsd-arm@freebsd.org mailing list=0A> https://lists.freebsd.org/mailman= /listinfo/freebsd-arm=0A> To unsubscribe, send any mail to "freebsd-arm-uns= ubscribe@freebsd.org"=0A>
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