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@amd.com Signed-off-by: Venkatesh Yadav Abbarapu venkatesh.abbarapu@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