Date: Mon, 23 Jan 2017 14:53:15 -0600 From: Dustin Marquess <dmarquess@gmail.com> To: Oleksandr Tymoshenko <gonzo@bluezbox.com> Cc: "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: Getting the kernel to let go of my UART! Message-ID: <CAJpsHY6c3Mu6iGc=FrPEvV5VtNubBGsgCRzOQegF5mJ-yQBUbQ@mail.gmail.com> In-Reply-To: <20170123204400.GA73924@bluezbox.com> References: <CAJpsHY4LEdtnTVVz3nrpQcLFePwNnVQ_RdZ3k-2VMaf=HAJ-9A@mail.gmail.com> <48f8cbc1-3814-b9f6-0e3a-ebe97466d1df@selasky.org> <CAJpsHY6Wsoi14YMR3nM_OwfZphqF7rA5-E=SGfB0sM5EXfP9KA@mail.gmail.com> <20170122190659.GA62786@bluezbox.com> <CAJpsHY4Q%2BnpLa7QsN7%2BWOPP9EF65EEakGgxUnW3cmOJ4p0iQMQ@mail.gmail.com> <CAJpsHY5JedMAG88ThNMTFiWb02TyGAPzLfMiOG0_0=p7%2BPXDhg@mail.gmail.com> <20170123204206.GA73799@bluezbox.com> <20170123204400.GA73924@bluezbox.com>
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On Mon, Jan 23, 2017 at 2:44 PM, Oleksandr Tymoshenko <gonzo@bluezbox.com> wrote: > Oleksandr Tymoshenko (gonzo@bluezbox.com) wrote: >> Dustin Marquess (dmarquess@gmail.com) wrote: >> > Okay, maybe the console thing was a red herring then. >> > >> > It's not marking it as a console at all anymore, but something is >> > still locking the baud rate to 115200. Even though stty and minicom >> > are both set to 9600, anything set/received at 9600 doesn't work/is >> > garbled. If I set it to 115200, it works fine. I had wrongly assumed >> > it was because of it marking it as a console (since the console line >> > in dmesg said 115200). >> > >> > Device map? enable_uart=1 aka core_freq= maybe? I'll try tinkering.. >> >> It might be a problem with the driver itself. From a quick glance, >> PL011 driver sets baudrate only if it has reference clock frequency >> which doesn't seem to be the case for RPi. If reference clock >> frequency is unknown divider register is left untouched. >> >> According to this document: http://elinux.org/RPiconfig you can >> set initial baudrate in config.txt using init_uart_baud variable > > Also if you use u-boot divider register can be overridden by U-Boot > intialization routine. Okay, you're completely amazing and I definitely owe you some alcoholic drinks! init_uart_baud=9600 did the trick completely. I had completely removed #define CONFIG_BCM283X_MU_SERIAL & #define CONFIG_PL01X_SERIAL in U-boot to keep it from even touching the UART, and for good measure I even commented-out the "puts("\r\nRPi3 PSCI monitor installed\r\n");" in your PSCI monitor code (which probably wasn't needed, but I wanted to keep the GPS module happy).. and sure enough, after adding that config.txt setting, it works like a charm! Thanks again! -Dustin
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