1.5.4 is Atmosphère's seventy-third official release.

Please be sure to update fusee when upgrading to 1.5.4. fusee-primary no longer exists, and will not work any more.

With thanks to the @switchbrew team, Atmosphère 1.5.4 is bundled with hbl 2.4.3, and hbmenu 3.5.1.

Please note: Atmosphère 1.5.4 is currently in pre-release, and issues may be found that need to be fixed before full release.

• If any bugs are reported while Atmosphère is in pre-release, they will be fixed and the build will be updated.
• 1.5.4 will transition to release after a short amount of time has passed without pressing bug reports.
• In particular, Atmosphère 1.5.4 contains an experimental new feature to support layeredfs/romfs mods for The Legend of Zelda: Tears of the Kingdom, which may have bugs I did not discover during my own testing.

The following was changed since the last release:

• Experimental new functionality was implemented to prevent crashing when building romfs for certain games with obscene file counts.
  • This includes both Fire Emblem: Engage (~190000 files), and The Legend of Zelda: Tears of the Kingdom (~300000) files.
  • The solution involved adding functionality to ams.mitm/pm to dynamically steal memory from the application (and system) pool as needed when the games have romfs mods.
    • No memory is taken, and there is no cost to this functionality when playing without mods (or with overrides disabled).
  • The Legend of Zelda: Tears of the Kingdom is currently the absolute worst case game, requiring ~48 MB of memory to build a romfs image to play with mods.
    • Right now, the memory is sourced as follows: 32 MB (base ams.mitm heap), 10 MB (stolen from application pool), 8 MB (dynamically stolen from system pool).
    • This is 50 MB, which allows a little overhead in the worst case (prevents crashing due to exhausting the heap for other allocations in ams.mitm).
    • Zelda is remarkably sensitive to memory being stolen from the application pool, tolerating no more than 16 MB on 1.0.0 and 12 MB on 1.1.0. I have chosen to steal 10 MB, to be safe, for now.
      • This may break on a future game update, but I will fix it if and when that happens. There is no perfect solution; the game simply requires too much memory to support mods flawlessly, and I am forced to compromise.
  • As usual, if you encounter a game that exhausts ams.mitm's memory (crashing it) when loading layeredfs mods, please contact SciresM#0524.
    • "I am jinxing myself by saying this, but it's really hard to imagine any game being worse than The Legend of Zelda: Tears of the Kingdom, but if it happens again I will drop everything to fix it as usual".
• General system stability improvements to enhance the user's experience.

For information on the featureset supported by 1.5, please see the official release notes.