No /dev/serial0 with LE 11.0.3 and later

ICE-1 · January 27, 2024 at 2:50 PM

Hello,

after update from LE 11.0.1 to 11.0.3 the /dev/serial0 and /dev/serial1 have vanished. Access with pyserial does not work any more.

With miniuart-bt in config.txt, there is /dev/ttyAMA and no /dev/ttys0. Without miniuart-bt, vice versa.

Unfortunately, from recent 11.0.5 the downgrade to 11.0.1 is no longer possible. Same occurs with a fresh clean install of LE 12 nightly.

config.txt:

C

# Copyright (C) 2016-present Team LibreELEC (https://libreelec.tv)
################################################################################
# Bootloader configuration
# config.txt version v1 (do not remove or change this line!)
################################################################################
# For more options and information see
# http://rpf.io/configtxt
################################################################################
# Default GPU memory split, 76MB are needed for H264 decoder
gpu_mem=76
# Don't send initial active source message.
# Avoids bringing CEC (enabled TV) out of standby and channel switch when
# rebooting.
hdmi_ignore_cec_init=1
[all]
################################################################################
# Use distroconfig-composite.txt instead of distroconfig.txt to enable
# composite video output.
# The composite video mode needs to be configured in cmdline.txt:
# For PAL add: video=Composite-1:720x576@50ie
# For NTSC add: video=Composite-1:720x480@60ie
################################################################################
include distroconfig.txt
#include distroconfig-composite.txt
# uncomment to enable analog audio output
#dtparam=audio=on
#audio_pwm_mode=1
# enable infrared remote receiver connected to GPIO 7
dtoverlay=gpio-ir,gpio_pin=7
dtoverlay=miniuart-bt
enable_uart=1
# enable fan with 55 Celsius and hysteresis 5 Kelvin on GPIO 17
dtoverlay=gpio-fan,gpiopin=17,temp=55000,hyst=5000

Display More

Output of dmesg | grep tty:

Code

[    0.000338] printk: console [tty0] enabled
[    1.649286] fe215040.serial: ttyS0 at MMIO 0xfe215040 (irq = 38, base_baud = 62500000) is a 16550
[    1.649386] serial serial0: tty port ttyS0 registered
[    1.684558] fe201000.serial: ttyAMA0 at MMIO 0xfe201000 (irq = 53, base_baud = 0) is a PL011 rev2
[    1.684808] printk: console [ttyAMA0] enabled

Any help? is it a bug? Thanks - Helmut

**Da Flex** · January 27, 2024 at 4:15 PM

On LE 11.0.5...

Please provide a full debug log.

How to post a log (wiki)

1. Enable debugging in Settings>System Settings>Logging
2. Restart Kodi
3. Replicate the problem
4. Generate a log URL (do not post/upload logs to the forum)

use "Settings > LibreELEC > System > Paste system logs" or run "pastekodi" over SSH, then post the URL link

You can still downgrade from SSH:

Code

cd /storage/.update
wget <URL_OF_YOUR_LE_11.0.1_DOWNLOAD>
reboot

ICE-1 · January 27, 2024 at 4:48 PM

Hello,

here is the log

https://paste.libreelec.tv/modern-terrier.log

I could try the wget, if I knew the URL of LE 11.0.1. I found only 11.0.3 and higher. Finally, I use a RPi4.

Regards - Helmut

**Da Flex** · January 27, 2024 at 5:28 PM

The link to LE 11.0.1 is dead. We are working on it...

**HiassofT** · January 27, 2024 at 5:28 PM

Just use /dev/ttyS0 or /dev/ttyAMA0 in your script.

The (downstream RPi) script and udev rule to create the alias symlinks have been removed a while ago when the RPi kernel finally switched to upstream kernel BT configuration.

brcmfmac_sdio-firmware-rpi: drop rpi-btuart script and service · LibreELEC/LibreELEC.tv@690a4fb

Bluetooth is finally initialized by the kernel Signed-off-by: Matthias Reichl <[email protected]>

github.com

so long,

Hias

ICE-1 · January 27, 2024 at 5:59 PM

Ok, does it mean no more miniuart-bt in the config.txt necessary? I will try it.

**HiassofT** · January 27, 2024 at 6:11 PM

It depends on what you want.

By default the RPi uses the (better) ttyAMA0 for bluetooth and you can enable the (less capable) ttyS0 for use in your script with enable_uart=1 in config.txt.

With the miniuart-bt overlay bluetooth uses ttyS0 and you can use ttyAMA0 in your script.

so long,

Hias

ICE-1 · February 5, 2024 at 9:15 AM

Hi,

I found a backup of LE11.0.1 and with this the symlinks /dev/serial0 and /dev/serial1 are created already, with date 02-16-2023. I am using the Joy-It Multimediacase, and seems, that the firmware of the built-in extension board needs this to shut down and reboot properly after LE was shut down.

Would be nice, if the symlinks will be created again in future LE releases, to keep compatibility

Regards - Helmut

No /dev/serial0 with LE 11.0.3 and later

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