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 | 49 +++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+)
diff --git a/board/xilinx/common/board.c b/board/xilinx/common/board.c index 12a877c715..9641ed307b 100644 --- a/board/xilinx/common/board.c +++ b/board/xilinx/common/board.c @@ -25,6 +25,7 @@ #include <i2c_eeprom.h> #include <net.h> #include <generated/dt.h> +#include <rng.h> #include <slre.h> #include <soc.h> #include <linux/ctype.h> @@ -682,3 +683,51 @@ phys_addr_t board_get_usable_ram_top(phys_size_t total_size) return reg + size; } #endif + +#ifdef CONFIG_OF_BOARD_SETUP +#define MAX_RAND_SIZE 8 +int ft_board_setup(void *blob, struct bd_info *bd) +{ + size_t n = MAX_RAND_SIZE; + struct udevice *dev; + u8 buf[MAX_RAND_SIZE]; + int nodeoffset, ret; + + if (uclass_get_device(UCLASS_RNG, 0, &dev) || !dev) { + debug("No RNG device\n"); + return 0; + } + + if (dm_rng_read(dev, buf, n)) { + debug("Reading RNG failed\n"); + return 0; + } + + if (!blob) { + debug("No FDT memory address configured. Please configure\n" + "the FDT address via "fdt addr <address>" command.\n" + "Aborting!\n"); + return 0; + } + + ret = fdt_check_header(blob); + if (ret < 0) { + debug("fdt_chosen: %s\n", fdt_strerror(ret)); + return ret; + } + + nodeoffset = fdt_find_or_add_subnode(blob, 0, "chosen"); + if (nodeoffset < 0) { + debug("Reading chosen node failed\n"); + return nodeoffset; + } + + ret = fdt_setprop(blob, nodeoffset, "kaslr-seed", buf, sizeof(buf)); + if (ret < 0) { + debug("Unable to set kaslr-seed on chosen node: %s\n", fdt_strerror(ret)); + return ret; + } + + return 0; +} +#endif