Trouble with Dreamcast Emulation RPI5

[Sever]

Hello there, I am having trouble running lr-flycast and reicast on my RPI5.

I have the bios files which I believe are correct, and Redream actually runs and launches games but it is very slow.

e10c53c2f8b90bab96ead2d368858623  dc_boot.bin
0a93f7940c455905bea6e392dfde92a4  dc_flash.bin
526eda1e2a7920c92c88178789d71d84  naomi.zip

Pi Model or other hardware: Pi5 4GB
Power Supply used: Official RPI5 power supply
RetroPie Version Used :

user@pi:~/RetroPie-Setup $ git show
commit 381020245f9be6a82be13bd81c0da04b971522b0 (grafted, HEAD -> master, origin/master, origin/HEAD)
Author: Jools Wills <buzz@exotica.org.uk>
Date:   Mon Feb 10 08:01:32 2025 +0000

Built From: On top of Raspi Lite
Verbose log (if relevant):

user@pi:~ $ cat /dev/shm/runcommand.log
Parameters:
Executing: /opt/retropie/emulators/retroarch/bin/retroarch -L /opt/retropie/libretrocores/lr-flycast/flycast_libretro.so </dev/null --config /opt/retropie/configs/dreamcast/retroarch.cfg "/home/guy/RetroPie/roms/dreamcast/Marvel vs. Capcom 2 - New Age of Heroes (Europe).chd" --verbose --appendconfig /dev/shm/retroarch.cfg
[WARN] [GameMode]: GameMode cannot be enabled on this system ("dlopen failed - libgamemode.so: cannot open shared object file: No such file or directory.") https://github.com/FeralInteractive/gamemode needs to be installed.
[WARN] [Config]: GameMode unsupported - disabling..
[INFO] RetroArch 1.19.1 (Git e948222)
[INFO] === Build =======================================
[INFO] Capabilities: ASIMD
[INFO] Version: 1.19.1
[INFO] Git: e948222
[INFO] Built: Feb 13 2025
[INFO] =================================================
[INFO] [Input]: Found input driver: "x".
[ERROR] Couldn't find any cloud sync driver named ""
[INFO] Available cloud sync drivers are:
[INFO]  webdav
[INFO]  null
[WARN] Going to default to first cloud sync driver...
[INFO] [Core]: Loading dynamic libretro core from: "/opt/retropie/libretrocores/lr-flycast/flycast_libretro.so"
[INFO] [Config]: Loading config: "/opt/retropie/configs/dreamcast/retroarch.cfg".
[INFO] [Config]: Appending config: "/dev/shm/retroarch.cfg".
[INFO] [Overrides]: Redirecting save file to "/home/guy/RetroPie/roms/dreamcast/Marvel vs. Capcom 2 - New Age of Heroes (Europe).srm".
[INFO] [Overrides]: Redirecting save state to "/home/guy/RetroPie/roms/dreamcast/Marvel vs. Capcom 2 - New Age of Heroes (Europe).state".
[INFO] [Environ]: GET_CORE_OPTIONS_VERSION.
[INFO] [Environ]: GET_LANGUAGE: "30".
[INFO] [Environ]: RETRO_ENVIRONMENT_SET_CORE_OPTIONS_V2_INTL.
[INFO] [Environ]: SET_CONTROLLER_INFO.
[INFO] [Environ]: GET_LOG_INTERFACE.
[INFO] [Environ]: GET_PERF_INTERFACE.
[INFO] [Environ]: SET_PIXEL_FORMAT: XRGB8888.
[INFO] [Environ]: SET_KEYBOARD_CALLBACK.
[INFO] [Environ]: GET_DISK_CONTROL_INTERFACE_VERSION.
[INFO] [Environ]: SET_DISK_CONTROL_EXT_INTERFACE.
[INFO] [Content]: Content loading skipped. Implementation will load it on its own.
[INFO] [Environ]: GET_RUMBLE_INTERFACE.
[INFO] [Environ]: SYSTEM_DIRECTORY: "/home/guy/RetroPie/BIOS".
[INFO] [Environ]: SAVE_DIRECTORY: "/home/guy/RetroPie/roms/dreamcast/".
[ERROR] [Environ]: GET_VARIABLE: reicast_cpu_mode - Invalid value.
[INFO] [Environ]: SET_SAVE_STATE_IN_BACKGROUND: yes.
[libretro INFO] File extension is: .chd
[INFO] [Environ]: GET_PREFERRED_HW_RENDER, video driver name: gl.
[INFO] [Environ]: GET_PREFERRED_HW_RENDER - Context callback set to RETRO_HW_CONTEXT_OPENGL.
[INFO] [Environ]: SET_HW_RENDER, context type: gl.
[INFO] Requesting OpenGLES2 context.
[libretro INFO] hw/mem/_vmem.cpp:482 N[VMEM]: Info: nvmem is enabled, with addr space of size 4GB
[libretro ERROR] libretro/libretro.cpp:3272 E[COMMON]: DEBUGBREAK!
/opt/retropie/supplementary/runcommand/runcommand.sh: line 1328:  8768 Trace/breakpoint trap   /opt/retropie/emulators/retroarch/bin/retroarch -L /opt/retropie/libretrocores/lr-flycast/flycast_libretro.so --config /opt/retropie/configs/dreamcast/retroarch.cfg "/home/guy/RetroPie/roms/dreamcast/Marvel vs. Capcom 2 - New Age of Heroes (Europe).chd" --verbose --appendconfig /dev/shm/retroarch.cfg < /dev/null

Here is the lastlog from reicast:

user@pi:~ $ cat /dev/shm/runcommand.log
Parameters:
Executing: /opt/retropie/emulators/reicast/bin/reicast.sh alsa "/home/user/RetroPie/roms/dreamcast/Crazy Taxi 2 (USA).chd" 3840 2160
/opt/retropie/emulators/reicast/bin/reicast.sh: line 35:  1533 Trace/breakpoint trap   "$rootdir/emulators/reicast/bin/reicast" "${params[@]}"

Hopefully someone can point me in the right direction.
Many thanks.

[Sever]

@Sever

I fixed this by doing the following:

add the line: kernel=kernel8.img

to

/boot/config.txt

[sirhenrythe5th]

@Sever just brainstorming: do you have "Settings > Latency > Run-Ahead" enabled by any chance?
Just asking because i had a very similar issue a couple of years ago when i started with lr-flycast and this (deactivating run-ahead) solved it.