flycast and freeze start screen in some games

kounabi22

metal slug 6
king of fighters xi
king of fighters neo wave
samurai shodown 6
neo geo battle colosieum
when i first run those games in flycast on my pi4 they are ok but after some loads the games just freeze after start logo screen and i get a white screen.
the only solution i found was if i delete the files that those games created in my rom folder (eeporm,vram files)

anyone else found a better solution

YFZdude

@kounabi22
That sounds similar to this issue:
https://retropie.org.uk/forum/topic/25835/atomiswave-problems-with-metal-slug-6-and-kof-neowave

CyberRazorCut

@kounabi22 This also happens to me in Flycast. I have to delete both of the nvmem files after each session. I have never found a solution to this, so if anyone knows of any solution then it would be gratefully appreciated.

YFZdude

@cyberrazorcut
The thread I linked has a workaround. It involves making the nvmem files read-only after the first launch.

This seems like an ugly duct tape version of a fix. Hopefully someone can investigate the problem causing this and file a bug report upstream.

kounabi22

thanks all for the reply..

i try the 2 solution i found in the other post.
sate states(try to load)
and the read only permision

CyberRazorCut

@kounabi22 Have you thought about trying the Atomiswave Dreamcast ports instead? I don't think they work in Flycast though, but do work in Redream.

DTEAM

@cyberrazorcut
@kounabi22

It works well with Lr-Flycast. Try to use gdi from a Dreamcast group on Google (can't say where)

They fix a lot of control issues and you can convert in chd for Atomiswave (smaller size).

The only problem I had with Lr-Flycast is with Dolphin Blue. This is a known issue with Lr-Flycast.

Some games stop randomly, but if you save often you will be able to restart where you were.

For Demolition Fist, when the menu freeze, wait the 9 seconds and you will go in the game with the first caracter. You will be able to change when you will die.

CyberRazorCut

@dteam Thanks for the reply and information. I have the Atomiswave ports for the Dreamcast in CHD format, but when using Flycast the SEGA screen loads up they crash. They work fine in Redream though. Do you have any ideas why that might be? Any help appreciated.

DTEAM

@cyberrazorcut
I don't know. Have you read this: https://docs.libretro.com/library/flycast/

Maybe It's a Bios issue. Run your game and after that, go /dev/shm and open your runcommand file to know what happens.

kounabi22

so far the games i play in flycast dont apear any problem

demol fist
doplhin blue
metal slug 6
samurai shodown 6
kof xi
kof nw
neogeo colosieum
melty blood act again
guilty gear xx ac
fist of the north star
Akatsuki Blitzkampf Ausf. Achse
faster than speed
jingy storm
maximum speed
rumble fish 2

DTEAM

@kounabi22
Same thing for me except for Dolphin Blue. It freezes at a specific place in the last stage (see picture).
Known bug. have you found a solution for that ?
alt text

kounabi22

@dteam

wow did not play it for too long .....if i catch up to you i will reply.

kounabi22

I try the the solution with the permissions but no good ,only the save and load state works for me

DTEAM

@kounabi22

It's seem to be fixed! 6 days ago
see: https://github.com/libretro/flycast/issues/450

kounabi22

@dteam

do i need to delete the old vram or not?

DTEAM

@kounabi22
They did the correction in flycast and not lr-flycast for now. I don’t think you need to change your rom or states.

Look for updates

New edit:
Done, they fixed it in the last lr-flycast update in RetropPie ! Yeah!