[RFC PATCH 15/16] tools/fdtgrep: Include __symbols__ table

[MD Danish Anwar]

This is required for overlays to work at SPL.

Loading of symbol table depends on DT Overlay support in SPL
so make it compile-time dependent. Without this SPL fails to
boot some platforms where this feature is not enabled
(e.g. dra71-evm.)

Without including the <linux/kconfig.h> file, the symbol
CONFIG_SPL_LOAD_FIT_APPLY_OVERLAY will not be visible and
we will never include the symbol table.

So include <linux/kconfig.h>

Due to some reason it needs to be included after
[#include "fdt_host.h"] otherwise it causes a build error.

Signed-off-by: MD Danish Anwar <danishanwar at ti.com>
---
 tools/fdtgrep.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/fdtgrep.c b/tools/fdtgrep.c
index 7eabcab439..706b4a35f4 100644
--- a/tools/fdtgrep.c
+++ b/tools/fdtgrep.c
@@ -22,6 +22,8 @@
 #include "fdt_host.h"
 #include "libfdt_internal.h"
 
+#include <linux/kconfig.h>
+
 /* Define DEBUG to get some debugging output on stderr */
 #ifdef DEBUG
 #define debug(a, b...) fprintf(stderr, a, ## b)
@@ -1234,6 +1236,12 @@ int main(int argc, char *argv[])
 		disp.fout = stdout;
 	}
 
+	if (IS_ENABLED(CONFIG_SPL_LOAD_FIT_APPLY_OVERLAY)) {
+		/* include symbol table */
+		if (value_add(&disp, &disp.value_head, FDT_IS_NODE, 1, "/__symbols__"))
+			usage("Cannot add __symbols__ value");
+	}
+
 	/* Run the grep and output the results */
 	ret = do_fdtgrep(&disp, filename);
 	if (disp.output_fname)
-- 
2.34.1