boards: riscv: rv32m1: use xoroshiro as default RNG

Don't use use the RV32M1 TRNG as a random source since it can be quite slow. Instead, use the software implemented xoroshiro RNG. Signed-off-by: David Leach <[email protected]>
liuguo09 · Nov 8, 2019 · d65ddcd · d65ddcd
1 parent cb03eba
commit d65ddcd
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/drivers/entropy/Kconfig.rv32m1 b/drivers/entropy/Kconfig.rv32m1
@@ -11,3 +11,9 @@ menuconfig ENTROPY_RV32M1_TRNG
 	help
 	  This option enables the true random number generator (TRNG)
 	  driver based on the RV32M1 TRNG driver.
+
+# Don't use use the RV32M1 TRNG as a random source since it can be quite slow.
+# Instead, use the software implemented xoroshiro RNG.
+choice RNG_GENERATOR_CHOICE
+	default XOROSHIRO_RANDOM_GENERATOR if ENTROPY_RV32M1_TRNG
+endchoice