guard

esphome/components/ota/ota_backend_esp8266.cpp

@@ -96,6 +96,8 @@ OTAResponseTypes ESP8266OTABackend::begin(size_t image_size) {
   // NOLINTNEXTLINE(readability-static-accessed-through-instance)
   this->buffer_size_ = (ESP.getFreeHeap() > 2 * FLASH_SECTOR_SIZE) ? FLASH_SECTOR_SIZE : MIN_BUFFER_SIZE;
 
+  // ESP8266's umm_malloc guarantees 4-byte aligned allocations, which is required
+  // for spi_flash_write(). This is the same pattern used by Arduino's Updater class.
   this->buffer_ = make_unique<uint8_t[]>(this->buffer_size_);
   if (!this->buffer_) {
     return OTA_RESPONSE_ERROR_UNKNOWN;