ricardgb commented on PR #19400:
URL: https://github.com/apache/nuttx/pull/19400#issuecomment-5067732825
@linguini1 on-hardware test logs from a Raspberry Pi Pico 2 W (RP2350),
NuttX 13.0.0-RC0, with `CONFIG_RP23XX_TRNG=y` (`DEV_RANDOM=y`,
`DEV_URANDOM_ARCH=y`).
**Both devices register:**
```
nsh> ls /dev
/dev:
console null random telnet ttyACM0 urandom zero
```
**`/dev/urandom` reads at the hardware ring-oscillator latency (~10 ms /
block, not the software PRNG):**
```
nsh> dd if=/dev/urandom of=/dev/null bs=64 count=1
64 bytes (1 blocks) copied, 10000 usec, 6 KB/s
```
**Two independent `/dev/urandom` samples differ (high entropy, no repeats /
constants / runs):**
```
sample A: 62 5e 5f 88 c4 f3 e3 68 12 91 68 4c 03 03 38 c0 ed 18 71 fe a9 2d
67 be ...
sample B: de f9 c7 27 df 42 89 91 dc 94 c1 9e 69 fd 7b 65 c8 aa 49 6f d7 cb
ad a3 ...
```
**`/dev/random` (blocking hardware source) returns real entropy — slower, as
it draws fresh conditioned bits through the VN/CRNGT/autocorrelation health
tests:**
```
nsh> dd if=/dev/random of=/dev/null bs=32 count=1
32 bytes (1 blocks) copied, 500000 usec, 0 KB/s
nsh> dd if=/dev/random of=/dev/null bs=64 count=1
64 bytes (1 blocks) copied, 370000 usec, 0 KB/s
```
The boot self-test gates the source (a failed source is marked unhealthy and
every read returns `-EIO`); all reads above succeed, so the source is healthy.
*Disclosure: these tests were run and captured with the help of an AI agent
(Claude Code, Anthropic); results are from real hardware and human-reviewed.*
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