RNG

This device does not show up in official memory maps, so it should probably be considered "unsupported" by Nuvoton.

It does however appear to follow the register layout of the NPCM7xx random number generator, and generate somewhat random numbers.

device	MMIO	reset	description
RNG	0xb800a000	3	random number generator

> wb b800a000 1
> rw b800a000 0x400
b800a000: 03030303 78787878 00000000 00000000 03030303 1e1e1e1e 00000000 00000000
b800a020: 01010101 00000000 00000000 00000000 01010101 00000000 00000000 00000000
b800a040: 01010101 00000000 00000000 00000000 03030303 3c3c3c3c 00000000 00000000
b800a060: 01010101 00000000 00000000 00000000 01010101 00000000 00000000 00000000
b800a080: 01010101 00000000 00000000 00000000 01010101 00000000 00000000 00000000
b800a0a0: 03030303 3c3c3c3c 00000000 00000000 01010101 00000000 00000000 00000000
b800a0c0: 01010101 00000000 00000000 00000000 01010101 00000000 00000000 00000000
b800a0e0: 01010101 00000000 00000000 00000000 03030303 1e1e1e1e 00000000 00000000


> ww b800a000 0x19
> rb b800a000 16
b800a000: 1b 1b 1b 1b 1e 1e 00 00 00 00 00 00 00 00 00 00
> wb b800a008 2
> rb b800a000 16
b800a000: 1b 1b 1b 1b 78 3c 00 00 02 02 02 02 02 02 02 02
> rb b800a000 64
b800a000: 1b 1b 1b 1b f1 e1 00 00 02 02 02 02 02 02 02 02
b800a010: 19 1b 1b 1b 78 00 00 00 02 02 02 02 02 02 02 02
b800a020: 1b 1b 1b 1b 1e 00 00 00 02 02 02 02 02 02 02 02
b800a030: 1b 1b 1b 1b 8f 00 00 00 02 02 02 02 02 02 02 02

Registers and address decoding

bit 31:12	11:4	3	2	1:0	description
b800a	x	0	0	x	control register
b800a	x	0	1	x	data register
b800a	x	1	x	x	mode register

References

• Driver for NPCM7xx RNG