[PATCH] lib/utils: fdt: Update FDT expand size to 1024 for reserved memory node

[Bin Meng]

From: Bin Meng <bin.meng at windriver.com>

Currently 256 bytes is used for the FDT expand size when fixing up
reserved memory node. Increase it to 1024 bytes with an estimated
size of 64 bytes per PMP memory region by 16 regions in total.

Signed-off-by: Bin Meng <bin.meng at windriver.com>
---

 lib/utils/fdt/fdt_fixup.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/lib/utils/fdt/fdt_fixup.c b/lib/utils/fdt/fdt_fixup.c
index adf1be3..a3bccae 100644
--- a/lib/utils/fdt/fdt_fixup.c
+++ b/lib/utils/fdt/fdt_fixup.c
@@ -151,8 +151,14 @@ int fdt_reserved_memory_fixup(void *fdt)
 	int na = fdt_address_cells(fdt, 0);
 	int ns = fdt_size_cells(fdt, 0);
 
-	/* expand the device tree to accommodate new node */
-	err  = fdt_open_into(fdt, fdt, fdt_totalsize(fdt) + 256);
+	/*
+	 * Expand the device tree to accommodate new node
+	 * by the following estimated size:
+	 *
+	 * Each PMP memory region entry occupies 64 bytes.
+	 * With 16 PMP memory regions we need 64 * 16 = 1024 bytes.
+	 */
+	err = fdt_open_into(fdt, fdt, fdt_totalsize(fdt) + 1024);
 	if (err < 0)
 		return err;
 
-- 
2.7.4