Raspberry Pi 4 release notes
1.0
Realtime kernel Raspberry 4.19.71-1-rt24-ARCH
Very
good CPU latency with a variation in test of only 5us max, 2us avg!
[root@raspberry
audiolinux]# cyclictest -l 10000 -m -Sp98 -i100 -d0
# /dev/cpu_dma_latency set to 0us
policy: fifo: loadavg: 3.72 1.93 0.76 1/166
15651
T: 0 (15648) P:98 I:100 C: 10000
Min: 4 Act: 4
Avg: 4 Max: 14
T: 1 (15649) P:98 I:100 C: 9725
Min: 4 Act: 6
Avg: 4 Max: 10
T: 2 (15650) P:98 I:100 C: 9463
Min: 4 Act: 4
Avg: 4 Max: 9
T: 3 (15651) P:98 I:100 C: 9150
Min: 4 Act: 5
Avg: 4 Max: 10
Ramroot
possible with 4GB model
MAIN MENU
0
"PROFILES menu"
1 "AUDIO menu"
2 "SYSTEM menu"
3 "STATUS menu"
4 "INSTALL/UPDATE menu"
5 "EXPERT menu"
6 "Show configuration"
7 "Console mode"
8 "SAVE System (if in
ram mode)"
9 "Poweroff"
10 "Reboot"
SYSTEM MENU
1 "FILE EDITOR"
2 "FILE EDITOR root"
3 "MOUNT local drive"
4 "MOUNT remote
drive"
5 "CLEAN system"
6 "RESIZE AL partition
(if in ram mode)"
7 "FORMAT extra drive"
8 "NETWORK
configuration (Bridge, DHCP, Static IP)"
9 "WiFi"
10 "REALTIME PRIORITY
to standard or extreme"
11 "RAMROOT
enable/disable (reboot after)"
12 "RAMROOT
configuration"
13 "BOOT mode to
Extreme, Standard or Custom"
14 "OVERLAYS
configuration"
15 "CPU SPEED to
performance or ondemand"
16 "ISOLATED CPU CORES
configuration"
17 "SAVE System (if in
ram mode)"
AUDIO MENU
1 "SHOW audio services"
2 "STOP and disable all
running audio services"
3 "HQPLAYER start and
enable (not available)"
4 "ROONSERVER start and
enable (not available)"
5 "ROONBRIDGE start and
enable"
6 "NAA start and
enable"
7 "AIRPLAY start and
enable"
8 "SQUEEZELITE select
DAC"
9 "SQUEEZELITE start
and enable"
10 "LMS start and
enable"
11 "MPD select DAC,
music directory and buffer"
12 "MPD start and
enable"
13 "MPD UPnP start and
enable"
14 "SPOTIFY start and
enable"
15 "SAVE System (if in
ram mode)"
UPDATE MENU
1 "Install/Update Roonbridge"
2 "Install/Update
HQPlayer embedded (not available)"
3 "Install/Update NAA"
4 "Update kernel (for
expert users)"
5 "System update (for
expert users)"
6 "Update audiolinux
menu"
7 "Install/Update MPD"
8 "Install/Update UPnP
for MPD"
9 "Install/Update
Logitech Media Server"
10 "Install/Update
Squeezelite"
11 "Install/Update
Spotify"
12 "Install/Update
Shairport-sync"
13 "Remove installed
audio applications"
14 "SAVE System (if in
ram mode)"
EXPERT MENU
1 "Assign a specific isolated core to audio applications"
2 "REALTIME EXPERT
CONFIGURATION enable/disable"
3 "REALTIME MANUAL
ASSIGNMENT enable/disable"
4 "ETHERNET speed
limit"
5 "WEB INTERFACE
enable/disable"
6 "ALSA system wide
configuration"
7 "SAMBA SERVER
enable/disable"
8 "SAMBA SERVER add
share"
9 "ENABLE/DISABLE
bluetooth"
10 "ENABLE/DISABLE
WiFi"
11 "SAVE System (if in
ram mode)"
PROFILES MENU
1 "Green"
2 "Orange (default)"
3 "Red"
4 "Auto (generated by
menus)"
5 "Copy Auto to Custom"
6 "Custom1"
7 "Custom2"
8 "Custom3"
Example configuration:
RTMANUAL="1"
RTEXPERT="0"
PRIORITY="standard"
CPUSPEED=""
BOOT="extreme"
ISOLATED="0"
ISOLATEDIRQ="0"
SAMBA=""
# RTMANUAL: realtime manual assignment
"1" enabled, "0" disabled
# RTEXPERT: realtime expert configuration "1"
enabled, "0" disabled
# PRIORITY: realtime priority
"standard", "extreme"
# CPUSPEED: CPU frequency
"performance", "ondemand" not available in realtime
kernel
# BOOT: boot mode
"standard", "extreme",
"custom"
# If you have configured boot mode with "SET CPU C-states" in Expert
menu, set this to an empty value
# ISOLATED: isolate a set of
cores
"0" disabled, <core number> (first is 0, not available) or an
interval of cores
# For example 1-2 will isolate core 1,2 / 1-3 wil isolate core 1,2,3 /
2 will isolate only core 2
# If enabled, all audio services will be disabled and hyper-threading
disabled even if set to 1 (enabled) on this configuration file
# You can re-enable your audio services after reboot
# ISOLATEDIRQ: isolate audio
irqs
"1" enabled, "0" disabled
# This will disable C-state configuration in expert menu
# SAMBA: samba server
"1" enabled, "0" disabled
# IMPORTANT: if value is empty your configuration will not be changed.
# This is useful if you have applied some special configuration, for
example if you have activated C-state in expert menu
# Example: BOOT=""
---------------
For Allo DigiOne, you should add the line
dtoverlay=allo-digione
to /boot/config.txt
For Allo boss, you should add the line
dtoverlay=allo-boss-pcm512x-audio
to /boot/config.txt
For I2S DAC (this configuration was tested on a rpi3/Sllo isolator/Kali
reclocker/Soekris 1121 DAC)
dtparam=i2c_arm=on
dtparam=i2s=on
dtparam=audio=off
dtoverlay=rpi-dac
For a full list of Raspberry options: https://www.raspberrypi.org/documentation/configuration/config-txt/overclocking.md