@xnox

In my case, this is on a TI AM3352 processor. The key config item is:

CONFIG_HW_RANDOM_OMAP=m

TI's docs indicate that the following is important:

CONFIG_CRYPTO_DEV_OMAP_SHAM=y

And these may be related:

CONFIG_CRYPTO_DEV_OMAP_AES=y
CONFIG_CRYPTO_SHA256_ARM=y
CONFIG_CRYPTO_SHA512_ARM=y

In general, for devices having a hardware random number generator, I
believe the following are needed:

CONFIG_HW_RANDOM=m
CONFIG_HW_RANDOM_TPM=m

I started by building an ubuntu kernel for this ARM processor; but after
some backported kernel patches broke the ubuntu kernel for my device, I
switched to the kernel.org stock 4.9 LTS kernel. Incidentally, that's
made it easier to get support from driver developers.

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https://bugs.launchpad.net/bugs/1835464

Title:
  nginx service fails after libssl update due to low entropy at boot

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