--- zzzz-none-000/linux-4.4.271/drivers/of/platform.c	2021-06-03 06:22:09.000000000 +0000
+++ hawkeye-5590-750/linux-4.4.271/drivers/of/platform.c	2023-04-19 10:22:29.000000000 +0000
@@ -21,6 +21,7 @@
 #include <linux/of_device.h>
 #include <linux/of_irq.h>
 #include <linux/of_platform.h>
+#include <linux/of_reserved_mem.h>
 #include <linux/platform_device.h>
 
 const struct of_device_id of_default_bus_match_table[] = {
@@ -185,6 +186,7 @@
 	dev->dev.platform_data = platform_data;
 	of_dma_configure(&dev->dev, dev->dev.of_node);
 	of_msi_configure(&dev->dev, dev->dev.of_node);
+	of_reserved_mem_device_init(&dev->dev);
 
 	if (of_device_add(dev) != 0) {
 		of_dma_deconfigure(&dev->dev);
@@ -470,6 +472,31 @@
 }
 EXPORT_SYMBOL_GPL(of_platform_default_populate);
 
+static int __init of_platform_default_populate_init(void)
+{
+	struct device_node *node;
+
+	if (!of_have_populated_dt())
+		return -ENODEV;
+
+	/*
+	 * Handle ramoops explicitly, since it is inside /reserved-memory,
+	 * which lacks a "compatible" property.
+	 */
+	node = of_find_node_by_path("/reserved-memory");
+	if (node) {
+		node = of_find_compatible_node(node, NULL, "ramoops");
+		if (node)
+			of_platform_device_create(node, NULL, NULL);
+	}
+
+	/* Populate everything else. */
+	of_platform_default_populate(NULL, NULL, NULL);
+
+	return 0;
+}
+arch_initcall_sync(of_platform_default_populate_init);
+
 static int of_platform_device_destroy(struct device *dev, void *data)
 {
 	/* Do not touch devices not populated from the device tree */