diff options
Diffstat (limited to 'common')
| -rw-r--r-- | common/Kconfig | 14 | ||||
| -rw-r--r-- | common/fdt_support.c | 13 |
2 files changed, 27 insertions, 0 deletions
diff --git a/common/Kconfig b/common/Kconfig index a7c5ba27..4e40692c 100644 --- a/common/Kconfig +++ b/common/Kconfig @@ -962,6 +962,20 @@ config TPL_HASH and the algorithms it supports are defined in common/hash.c. See also CMD_HASH for command-line access. +config BOARD_RNG_SEED + bool "Provide /chosen/rng-seed property to the linux kernel" + help + Selecting this option requires the board to define a + board_rng_seed() function, which should return a buffer + which will be used to populate the /chosen/rng-seed property + in the device tree for the OS being booted. + + It is up to the board code (and more generally the whole + BSP) where and how to store (or generate) such a seed, how + to ensure a given seed is only used once, how to create a + new seed for use on subsequent boots, and whether or not the + kernel should account any entropy from the given seed. + endmenu menu "Update support" diff --git a/common/fdt_support.c b/common/fdt_support.c index a334e008..f1f2d1ea 100644 --- a/common/fdt_support.c +++ b/common/fdt_support.c @@ -7,6 +7,7 @@ */ #include <common.h> +#include <abuf.h> #include <env.h> #include <mapmem.h> #include <stdio_dev.h> @@ -274,6 +275,7 @@ int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end) int fdt_chosen(void *fdt) { + struct abuf buf = {}; int nodeoffset; int err; char *str; /* used to set string properties */ @@ -289,6 +291,17 @@ int fdt_chosen(void *fdt) if (nodeoffset < 0) return nodeoffset; + if (IS_ENABLED(CONFIG_BOARD_RNG_SEED) && !board_rng_seed(&buf)) { + err = fdt_setprop(fdt, nodeoffset, "rng-seed", + abuf_data(&buf), abuf_size(&buf)); + abuf_uninit(&buf); + if (err < 0) { + printf("WARNING: could not set rng-seed %s.\n", + fdt_strerror(err)); + return err; + } + } + str = env_get("bootargs"); if (str) { err = fdt_setprop(fdt, nodeoffset, "bootargs", str, |