royzah commented on PR #20191:
URL: https://github.com/apache/nuttx/pull/20191#issuecomment-5794812999
Run on hardware: i.MX93, Cortex-A55, PX4 kernel build, NuttX 12.11.0.
Shell reached over MAVLink `SERIAL_CONTROL`.
```
NuttShell (NSH) NuttX-12.11.0
uname -a
NuttX 12.11.0 1ace719ff0 Sep 23 2026 12:02:35 arm64 px4
ls /dev
/dev:
console
...
random
...
urandom
zero
```
Two consecutive reads, distinct:
```
hexdump /dev/random -c 32
/dev/random at 00000000:
0000: 7c 9a f9 b0 fb 89 be 9d 23 bf 17 28 88 43 67 10
0010: c5 79 10 9e d7 be ca 42 2f 51 00 bd bc ce 77 54
hexdump /dev/random -c 32
/dev/random at 00004800:
0000: e4 82 74 40 86 7a 73 87 de a7 40 ea 5d 65 89 2a
0010: 34 f5 fb 9a c1 8d 95 c5 2f cf ad 91 b0 d7 ba 6b
```
`/dev/urandom` likewise returns distinct blocks.
The tested build applies this branch onto a downstream i.MX93 board tree:
`imx9_rng.c` and `imx9_ele.h` are byte-identical to it, `imx9_ele.c` differs
only by `#include <debug.h>` in place of `<nuttx/debug.h>`. The prompt is
elided from the log above; nothing else is changed.
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