boards: witte: linum: enable SDRAM support

To allow the display framebuffers to be placed
at the external RAM memory available on the
Linum board.

Signed-off-by: Felipe Neves <[email protected]>

Author: uLipe

boards/witte/linum/CMakeLists.txt

@@ -0,0 +1,7 @@
+# Copyright (c) 2025 Felipe Neves
+# SPDX-License-Identifier: Apache-2.0
+
+zephyr_include_directories(.)
+
+zephyr_linker_sources_ifdef(CONFIG_MEMC
+  SECTIONS sdram.ld)

boards/witte/linum/sdram.ld

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2025 Felipe Neves.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#if DT_NODE_HAS_STATUS(DT_NODELABEL(sdram1), okay)
+GROUP_START(SDRAM1)
+
+	SECTION_PROLOGUE(_STM32_SDRAM1_SECTION_NAME, (NOLOAD),)
+	{
+		*(.lvgl_buf)
+		*(.lvgl_heap)
+	} GROUP_LINK_IN(SDRAM1)
+
+GROUP_END(SDRAM1)
+#endif