Hello,
I have Raspberry Pi 3B+ with FreeBSD 12.1-RELEASE r354233 GENERIC arm64 installed on it.
And I tried to connect to serial port and see the boot process and have access to terminal.
I had connected USB-RS232 adapter (PL2303), USB port to my laptop and DB9 port to UART Pins: Pin8(TX), Pin10(RX) and Pin6(GRN) on RPi 3B+.
I have an adapter like this USB 2,0 - RS-232 (9-pin) DB9 Cable FTDI Chipset
After connect DB9 port to UART Pins on the adapter has turned on Green LED.
On my Raspberry Pi 3B+ I have this configuration:
That's makes me think that something is wrong, ttyu0 don't show me some information
On my Laptop side:
Now I reboot RPi and in my Laptop y connect to ttyUSB0 like this:
I can see junk characters y nothing more:
When I connected again I have only black screen.
I have lost some configuration in the part of RPi 3B+?
Best regards,
I have Raspberry Pi 3B+ with FreeBSD 12.1-RELEASE r354233 GENERIC arm64 installed on it.
And I tried to connect to serial port and see the boot process and have access to terminal.
I had connected USB-RS232 adapter (PL2303), USB port to my laptop and DB9 port to UART Pins: Pin8(TX), Pin10(RX) and Pin6(GRN) on RPi 3B+.
I have an adapter like this USB 2,0 - RS-232 (9-pin) DB9 Cable FTDI Chipset
After connect DB9 port to UART Pins on the adapter has turned on Green LED.
On my Raspberry Pi 3B+ I have this configuration:
Code:
# dmesg | grep uart
uart0: <PrimeCell UART (PL011)> mem 0x7e201000-0x7e201fff irq 25 on simplebus0
uart0: console (115200,n,8,1)
Code:
# cat /etc/ttys | grep ttyu0
ttyu0 "/usr/libexec/getty std.9600" vt100 on secure
#ttyu0 "/usr/libexec/getty 3wire" vt100 onifconsole secure
Code:
#cat /boot/loader.conf
boot_multicons="YES"
boot_serial="YES"
comconsole_speed="9600"
console="comconsole,vidconsole"
Code:
# cat /boot/msdos/config.txt
arm_control=0x200
dtparam=audio=on,i2c_arm=on,spi=on
dtoverlay=mmc
dtoverlay=pwm
dtoverlay=pi3-disable-bt
device_tree_address=0x4000
kernel=u-boot.bin
baudrate=9600
console=ttyu0,9600
That's makes me think that something is wrong, ttyu0 don't show me some information
Code:
# stty -a < /dev/ttyu0
^C
On my Laptop side:
Code:
# stty -a -F /dev/ttyUSB0
speed 9600 baud; rows 0; columns 0; line = 0;
intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>; eol2 = <undef>; swtch = <undef>;
start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W; lnext = ^V; discard = ^O;
min = 100; time = 2;
Code:
# setserial -g /dev/ttyUSB0
/dev/ttyUSB0, UART: 16654, Port: 0x0000, IRQ: 0
Now I reboot RPi and in my Laptop y connect to ttyUSB0 like this:
Code:
screen /dev/ttyUSB0 9600
Code:
�`P��'oĎ7�473���ag�f� ��"
&�("
I have lost some configuration in the part of RPi 3B+?
Best regards,