From a2f7e898a9b380f9833c0b908290748fa3f92d4d Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Fri, 10 Oct 2025 08:52:52 -1000
Subject: [PATCH] limit 8266 to 10

---
 script/test_build_components.py | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/script/test_build_components.py b/script/test_build_components.py
index c6045f2a3e..bc4affc171 100755
--- a/script/test_build_components.py
+++ b/script/test_build_components.py
@@ -38,6 +38,14 @@ from script.analyze_component_buses import (
 )
 from script.merge_component_configs import merge_component_configs
 
+# Platform-specific maximum group sizes
+# ESP8266 has limited IRAM and can't handle large component groups
+PLATFORM_MAX_GROUP_SIZE = {
+    "esp8266-ard": 10,  # ESP8266 Arduino has limited IRAM
+    "esp8266-idf": 10,  # ESP8266 IDF also has limited IRAM
+    # Other platforms can handle larger groups
+}
+
 
 def show_disk_space_if_ci(esphome_command: str) -> None:
     """Show disk space usage if running in CI during compile.
@@ -525,6 +533,28 @@ def run_grouped_component_tests(
             # No other groups for this platform - keep no_buses components together
             grouped_components[(platform, NO_BUSES_SIGNATURE)] = no_buses_comps
 
+    # Split groups that exceed platform-specific maximum sizes
+    # ESP8266 has limited IRAM and can't handle large component groups
+    split_groups = {}
+    for (platform, signature), components in list(grouped_components.items()):
+        max_size = PLATFORM_MAX_GROUP_SIZE.get(platform)
+        if max_size and len(components) > max_size:
+            # Split this group into smaller groups
+            print(
+                f"\n  ℹ️ Splitting {platform} group (signature: {signature}) "
+                f"from {len(components)} to max {max_size} components per group"
+            )
+            # Remove original group
+            del grouped_components[(platform, signature)]
+            # Create split groups
+            for i in range(0, len(components), max_size):
+                split_components = components[i : i + max_size]
+                # Create unique signature for each split group
+                split_signature = f"{signature}_split{i // max_size + 1}"
+                split_groups[(platform, split_signature)] = split_components
+    # Add split groups back
+    grouped_components.update(split_groups)
+
     groups_to_test = []
     individual_tests = set()  # Use set to avoid duplicates