casaroli commented on PR #19525:
URL: https://github.com/apache/nuttx/pull/19525#issuecomment-5073939092
### Tested on real RP2350 silicon
Built `raspberrypi-pico-2:nsh` with `CONFIG_RP23XX_RNG=y` +
`CONFIG_DEV_RANDOM=y`
+ `CONFIG_DEV_URANDOM=y` and flashed a Pimoroni Pico Plus 2 (RP2350) via a
Raspberry Pi Debug Probe (CMSIS-DAP), console on UART0.
Both devices register and return hardware entropy:
```
nsh> ls /dev
...
random
urandom
nsh> dd if=/dev/random of=/dev/console bs=16 count=1
88fa6c4c e81eac6f 3a5ba0ab f925c399
nsh> dd if=/dev/urandom of=/dev/console bs=16 count=1
d85763ab 03e8b399 695248e6 3ce68deb
```
Consecutive reads of `/dev/random` differ, as expected for a true RNG:
```
read #1: 214b0fc9 9b3a327b 8b7e2bda ce8d97b6
read #2: 0e9c9a04 07c0f013 a98ef4a7 783c1303
```
Reads complete without blocking and every request length returns the full
number of bytes.
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