7
votes
Accepted
How to enable the second console to a FreeBSD guest running in bhyve?
The solution is to modify /etc/ttys on the guest. On amd64, it has the following defaults:
#
# $FreeBSD: head/sbin/init/ttys.amd64 338454 2018-09-04 15:48:13Z brd $
# @(#)ttys 5.1 (Berkeley) 4/17/...
- 5,003
7
votes
Accepted
What are the implications of setting the baud rate of a terminal from userspace?
It looks like you might be a bit confused about how this all works.
First, /dev/ttyACM0 does not represent the USB link, or even the USB endpoint for whatever serial adapter you have connected, it ...
- 13.5k
6
votes
Retrieve file over serial without kermit and lrzsz
Summarizing above posts i found something like this:
Sending.
Start receiving on target:
cat | base64 -d > filetotarget.bin
Exit minicom with Ctrl-A + Q and then run on host machine:
cat ...
- 266
6
votes
Accepted
Retrieve file over serial without kermit and lrzsz
Finally found out that I was issuing the wrong command on receiver's side.
Receive command shall be : cat < /dev/ttyUSB0 > file_b64
Summary
To receive from remote :
Host side ...
- 1,198
3
votes
How to mirror serial output ttyS0 to the HDMI /dev/dri/card0?
Specify console=tty0 in the kernel command line to have it go to the framebuffer console (the compiled-in default is likely set to console=ttyS0). This won't use DRI directly; rather it will use the ...
- 15.5k
3
votes
Accepted
Bash script - Watch serial-port for specific string, then send back commands
echo -n "1" >&5 did the trick for me. Seems like uboot doesn´t want to get a newline, otherwise it behaves weird.
Thanks a lot for your help!
Here is the "complete" script, maybe it is ...
- 61
3
votes
Failing to Enable UARTs on Beaglebone Black
The following works for Debian 9.9 with Kernel 4.14 (also worked with Debian 8.3, did not work with Debian 9.3).
Upon booting into it you'll see the /dev/ttyO1,O2,O4 files, but they won't work until ...
- 131
2
votes
Accepted
How can I determine if a latency is due to a driver or the scheduler?
strace is not likely to give you the necessary level of detail; you will probably need SystemTap, sysdig, or similar kernel-level debugging to better show when what is happening. For example with ...
- 35.8k
2
votes
Accepted
How to use UART pins on Orange Pi zero?
My config on Orange Pi Zero for UART on mainline kernel:
overlay_prefix=sun8i-h3
overlays=usbhost2 usbhost3 uart1 uart2
Both UARTs work fine.
$ uname -a
Linux orangepizero 4.13.16-sunxi #20 SMP Fri ...
- 136
2
votes
Failing to Enable UARTs on Beaglebone Black
I can vouch for Debian 10 using this method:
I was able to enable all 4.5 UARTs automatically on boot-up. Unlike Debian 9 and older versions, the uEnv.txt is present in /boot/.
Back up this file.
...
- 1,519
1
vote
Writing additional kernel layer on UART driver
What you describe exists:
PPP is supported by the linux kernel out of the box, as is the HDLC framing you'd use over serial lines. For info how to make that work with pppd negotiating the connection ...
- 52k
1
vote
How to integrate radio modules to Linux networking stack
The PPP protocol was developed to provide a data link layer over a serial connection.
In Linux, the PPP protocol is implemented by the ppp package, which is almost certainly available as a package for ...
- 38.5k
1
vote
Manually installing drivers on Linux Mint
From the readme file:
Installation
------------
* Compile and install the common usb serial driver module
# make
# insmod ./xr_usb_serial_common.ko
Which means: Open a command prompt; ...
- 233
1
vote
Accepted
The linux boot message in dmesg doesn't output to uart
Find the answer in Xilinx forum.
It is indeed a problem with the console.
https://forums.xilinx.com/t5/Embedded-Linux/quot-Warning-unable-to-open-an-initial-console-quot-Under/m-p/1117002
It seems ...
- 11
1
vote
How are the TTY and serial_core related?
I now, after a long time reading, analysing and reading code again, came to understand the code which is very difficult to understand given the lack of comments.
The goal of all this is to create a ...
- 31
1
vote
Raspberry Pi UART not working
Rx should be connected to Tx, not Rx:
RPi: Rx Tx
| |
\ /
x
/ \
| |
Laptop: Rx Tx
- 119
1
vote
Is there a limit to the number of FTDI connections on Debian 9?
yes
This is a limitation of the Intel xHCI chipset used on the motherboard.
Specifically, most of these chips limit the number of "devices" to 32. But a single physical thing like a camera may ...
- 213
1
vote
Read Write Serial Device not Working in Shell Script
Ok, I don't know why, but after I changed to use bash shell, the script works. The default shell is dash.
- 21
1
vote
Debian not recognizing my ttyS0 / console redirection not working
Soon I realized that my ttyS0 is somehow not working correctly.
Starting to debug my physical serial interfaces I just couldn't find a
way to get this to work.
In my case, on a fitlet2 with Atom ...
- 251
1
vote
Hardware controlled RTS on tty
The problem was that the device tree did not correctly configure the RTS and CTS pins for use with the relevant UART. The device tree should contain something like:
&uart1 {
pinctrl-names = &...
- 195
1
vote
Failing to Enable UARTs on Beaglebone Black
After trying everything listed in the "Long and Detailed Question", I still had no luck initializing my UART ports. My problem ended up being that my BeagleBone Black (BBB) came preflashed with Debian ...
- 11
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