Date: Sun, 22 Jan 2017 10:32:39 +0100 From: Hans Petter Selasky <hps@selasky.org> To: Dustin Marquess <dmarquess@gmail.com>, freebsd-arm@freebsd.org Subject: Re: Getting the kernel to let go of my UART! Message-ID: <48f8cbc1-3814-b9f6-0e3a-ebe97466d1df@selasky.org> In-Reply-To: <CAJpsHY4LEdtnTVVz3nrpQcLFePwNnVQ_RdZ3k-2VMaf=HAJ-9A@mail.gmail.com> References: <CAJpsHY4LEdtnTVVz3nrpQcLFePwNnVQ_RdZ3k-2VMaf=HAJ-9A@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On 01/22/17 06:07, Dustin Marquess wrote: > [Sorry if this is somewhat of a dupe, I have yet to find a solution] > > I've been running FreeBSD on my Pi 3s for a little over a month now, > first using gonzo's SMP code + a home cross-compiled kernel, and then > I moved to the HardenedBSD images. All of them work great except one > issue that's driving me nuts... > > The downside to the Pi 3 vs some other boards is that there's really > only one UART tied to the GPIO pins. I'm trying to feed my Pi 3 with > a GPS board. > > 1st issue: The NMEA stream upsets U-boot. Fine, compiled my own and > that's "fixed". > > 2nd issue: Even with a USB keyboard attached and HDMI output > connected, FreeBSD still wants to steal the first uart (ttyu0) as a > console port. I thought that would be fine as long as I use "-m -n > -q" in the boot config to disable kernel output and then "conscontrol > delete ttyu0". Well, that KIND of works. It seems to work fine when > using 115200bps, but trying to change the baud rate to match the GPS > unit doesn't seem to work at all, I'm guessing because it's still set > as an available console? > > hint.uart.0.flags="0x0" doesn't work, as it still marks it as a > console. console="efi" seems to be the only setting that works, > "vidconsole" and "nullconsole" both don't work. > > Is there a way to stop the kernel from trying to claim the UART as a console? I think so, have a look in /etc/ttys and comment out the ttyu0 line. --HPS
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?48f8cbc1-3814-b9f6-0e3a-ebe97466d1df>