[PATCH 1/2] xilinx: board: Update the kaslr-seed property

[Venkatesh Yadav Abbarapu]

Create a ft_board_setup() api that gets called as part
of bootm/booti before jumping to kernel. In this
ft_board_setup() callback that will inspect the DTB
and insert the device tree blob with the "kaslr-seed" property.

Signed-off-by: Michal Simek <michal.simek at amd.com>
Signed-off-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu at amd.com>
---
 board/xilinx/common/board.c | 59 +++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/board/xilinx/common/board.c b/board/xilinx/common/board.c
index 12a877c715..985a3825e6 100644
--- a/board/xilinx/common/board.c
+++ b/board/xilinx/common/board.c
@@ -682,3 +682,62 @@ phys_addr_t board_get_usable_ram_top(phys_size_t total_size)
 	return reg + size;
 }
 #endif
+
+#ifdef CONFIG_OF_BOARD_SETUP
+int ft_board_setup(void *blob, struct bd_info *bd)
+{
+	size_t n = 0x8;
+	struct udevice *dev;
+	u64 *buf;
+	int nodeoffset;
+	int ret;
+
+	if (uclass_get_device(UCLASS_RNG, 0, &dev) || !dev) {
+		debug("No RNG device\n");
+		return 0;
+	}
+
+	buf = malloc(n);
+	if (!buf) {
+		debug("Out of memory\n");
+		return 0;
+	}
+
+	if (dm_rng_read(dev, buf, n)) {
+		debug("Reading RNG failed\n");
+		ret = 0;
+		goto end;
+	}
+
+	if (!blob) {
+		debug("No FDT memory address configured. Please configure\n"
+		      "the FDT address via \"fdt addr <address>\" command.\n"
+		      "Aborting!\n");
+		ret = 0;
+		goto end;
+	}
+
+	ret = fdt_check_header(blob);
+	if (ret < 0) {
+		printf("fdt_chosen: %s\n", fdt_strerror(ret));
+		goto end;
+	}
+
+	nodeoffset = fdt_find_or_add_subnode(blob, 0, "chosen");
+	if (nodeoffset < 0) {
+		printf("Reading chosen node failed\n");
+		ret = -EINVAL;
+		goto end;
+	}
+
+	ret = fdt_setprop(blob, nodeoffset, "kaslr-seed", buf, sizeof(buf));
+	if (ret < 0) {
+		printf("Unable to set kaslr-seed on chosen node: %s\n", fdt_strerror(ret));
+		goto end;
+	}
+end:
+	free(buf);
+
+	return ret;
+}
+#endif
-- 
2.25.1