From 0cf272590d23434f9e96693755b9342ba84f4c5e Mon Sep 17 00:00:00 2001
From: Bobbe <maxschlecht@web.de>
Date: Thu, 18 Jun 2026 16:52:59 +0200
Subject: [PATCH] klipper-firmware: build bossac flash binary conditionally

---
 pkgs/servers/klipper/klipper-firmware.nix | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/pkgs/servers/klipper/klipper-firmware.nix b/pkgs/servers/klipper/klipper-firmware.nix
index 6ab6beac9ac3..67c0fc842631 100644
--- a/pkgs/servers/klipper/klipper-firmware.nix
+++ b/pkgs/servers/klipper/klipper-firmware.nix
@@ -20,11 +20,16 @@ args@{
 # are used by flash scripts
 # find those with `rg '\[\"lib'` inside of klipper repo
 let
+  needsBossac =
+    let
+      lines = lib.strings.splitString "\n" (builtins.readFile firmwareConfig);
+    in
+    builtins.any (line: builtins.match "[^#\r\n]*CONFIG_MACH_ATSAMD?=y.*" line != null) lines;
   flashBinaries = [
-    "lib/bossac/bin/bossac"
     "lib/hidflash/hid-flash"
     "lib/rp2040_flash/rp2040_flash"
-  ];
+  ]
+  ++ lib.optional needsBossac "lib/bossac/bin/bossac";
 in
 stdenv.mkDerivation {
   pname = "klipper-firmware-${mcu}";
@@ -41,8 +46,8 @@ stdenv.mkDerivation {
     avrdude
     stm32flash
     pkg-config
-    wxwidgets_3_2 # Required for bossac
-  ];
+  ]
+  ++ lib.optional needsBossac wxwidgets_3_2;
 
   configurePhase = ''
     cp ${firmwareConfig} ./.config