dt: add helper for empty dt creation
We want to get rid of the concept of loading an external device tree and instead
generate our own. However, to do this we need to also create a device tree
template programatically.
This patch adds a helper to create an empty device tree in memory.
Signed-off-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Peter Crosthwaite <peter.crosthwaite@petalogix.com>
diff --git a/device_tree.c b/device_tree.c
index 2f127b7..d037896 100644
--- a/device_tree.c
+++ b/device_tree.c
@@ -25,6 +25,43 @@
#include <libfdt.h>
+#define FDT_MAX_SIZE 0x10000
+
+void *create_device_tree(int *sizep)
+{
+ void *fdt;
+ int ret;
+
+ *sizep = FDT_MAX_SIZE;
+ fdt = g_malloc0(FDT_MAX_SIZE);
+ ret = fdt_create(fdt, FDT_MAX_SIZE);
+ if (ret < 0) {
+ goto fail;
+ }
+ ret = fdt_begin_node(fdt, "");
+ if (ret < 0) {
+ goto fail;
+ }
+ ret = fdt_end_node(fdt);
+ if (ret < 0) {
+ goto fail;
+ }
+ ret = fdt_finish(fdt);
+ if (ret < 0) {
+ goto fail;
+ }
+ ret = fdt_open_into(fdt, fdt, *sizep);
+ if (ret) {
+ fprintf(stderr, "Unable to copy device tree in memory\n");
+ exit(1);
+ }
+
+ return fdt;
+fail:
+ fprintf(stderr, "%s Couldn't create dt: %s\n", __func__, fdt_strerror(ret));
+ exit(1);
+}
+
void *load_device_tree(const char *filename_path, int *sizep)
{
int dt_size;
