tests/esp-ci-boards: add CI board for ESP32-C6

Use an external board definition to be able compile modules that are not enabled by default in CI.

Author: gschorcht

tests/build_system/external_board_dirs/esp-ci-boards/esp32c6-ci/Kconfig

@@ -0,0 +1,13 @@
+# SPDX-FileCopyrightText: 2025 Gunar Schorcht
+# SPDX-License-Identifier: LGPL-2.1-only
+
+config BOARD
+    default "esp32c6-ci" if BOARD_ESP32C6_CI
+
+config BOARD_ESP32C6_CI
+    bool
+    default y
+    select BOARD_COMMON_ESP32C6
+    select CPU_MODEL_ESP32C6_MINI_1X_X4
+
+source "$(RIOTBOARD)/common/esp32c6/Kconfig"

tests/build_system/external_board_dirs/esp-ci-boards/esp32c6-ci/Makefile

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+# This must be a different name than 'board' as it is implemented by 'esp32c6-devkit'
+MODULE = board_esp32c6-ci
+
+DIRS += $(RIOTBOARD)/esp32c6-devkit
+
+include $(RIOTBASE)/Makefile.base

tests/build_system/external_board_dirs/esp-ci-boards/esp32c6-ci/Makefile.dep

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+# This must be a different name than 'board' as it is implemented by 'esp32c6-devkit'
+USEMODULE += board_esp32c6-ci
+
+USEMODULE += esp_idf_heap
+USEMODULE += esp_jtag
+USEMODULE += esp_log_startup
+USEMODULE += esp_log_tagged
+
+ifneq (,$(filter periph_i2c,$(USEMODULE)))
+  USEMODULE += esp_i2c_hw
+endif
+
+ifneq (,$(filter netdev_default,$(USEMODULE)))
+  # if netdev_default is used, we use gnrc modules that are enabled
+  # in different examples to use different esp_wifi modules
+  ifneq (,$(filter gnrc_netif_single,$(USEMODULE)))
+    # if gnrc_netif_single module is enabled, esp_wifi_enterprise is used
+    USEMODULE += esp_wifi_enterprise
+  else
+    # in all other case esp_wifi_ap is enabled
+    USEMODULE += esp_wifi_ap
+  endif
+endif
+
+ifneq (,$(filter ws281x,$(USEMODULE)))
+  USEMODULE += ws281x_esp32_sw
+endif
+
+include $(RIOTBOARD)/esp32c6-devkit/Makefile.dep

tests/build_system/external_board_dirs/esp-ci-boards/esp32c6-ci/Makefile.features

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+FEATURES_PROVIDED += esp_rtc_timer_32k
+
+include $(RIOTBOARD)/esp32c6-devkit/Makefile.features

tests/build_system/external_board_dirs/esp-ci-boards/esp32c6-ci/Makefile.include

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+# We must duplicate the include done by $(RIOTBASE)/Makefile.include
+# to also include the main board header
+INCLUDES += $(addprefix -I,$(wildcard $(RIOTBOARD)/esp32c6-devkit/include))
+
+# WIFI_EAP_USER and WIFI_EAP_PASS have to be defined to compile the
+# optional module esp_wifi_enterprise in CI
+CFLAGS += -DWIFI_EAP_USER=\"[email protected]\"
+CFLAGS += -DWIFI_EAP_PASS=\"riot\"
+
+include $(RIOTBOARD)/esp32c6-devkit/Makefile.include