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cmd: kaslrseed: add command to generate value from hwrng

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Allow the kaslr-seed value in the chosen node to be set from a hardware
rng source.

Tested on a Rockchip PX30 (Odroid Go Advance), you must have loaded
the devicetree first and prepared it for editing. On my device the
workflow goes as follows:

setenv dtb_loadaddr "0x01f00000"
load mmc 0:1 ${dtb_loadaddr} rk3326-odroid-go2.dtb
fdt addr ${dtb_loadaddr}
fdt resize
kaslrseed

and the output can be seen here:
fdt print /chosen
chosen {
        kaslr-seed = <0x6f61df74 0x6f7b996c>;
        stdout-path = "serial2:115200n8";
};

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Chris Morgan
2021-08-25 11:22:57 -05:00
committed by Kever Yang
parent 734ad93376
commit fe3dde3e7b
3 changed files with 89 additions and 0 deletions
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cmd/Makefile
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@@ -131,6 +131,7 @@ obj-$(CONFIG_CMD_REGINFO) += reginfo.o
obj-$(CONFIG_CMD_REISER) += reiser.o
obj-$(CONFIG_CMD_REMOTEPROC) += remoteproc.o
obj-$(CONFIG_CMD_RNG) += rng.o
obj-$(CONFIG_CMD_KASLRSEED) += kaslrseed.o
obj-$(CONFIG_CMD_ROCKUSB) += rockusb.o
obj-$(CONFIG_CMD_RTC) += rtc.o
obj-$(CONFIG_SANDBOX) += host.o