[PATCH v3 0/6] arm64: dts: rockchip: Add ROCK 2A/2F, Sige1 and NanoPi Zero2

[Chukun Pan]

Hi,

> Just for the record: There actually is a non-A version of the
> RK3528, which I actually own (but forgot about - perhaps my subconscious
> made me reply to this thread). It's on the Mango Pi M28K board [0][1][2] -
> which, to my knowledge, is one of the first RK3528-based SBCs.

Thanks for sharing this. M28S is an engineering test board, and the official
version was later renamed M28K. The MangoPi M28K board uses the RK3528A SoC.
As for the M28S board, the silkscreen of SoC is indeed RK3528. [1]
But then the interesting thing comes, uboot reports it is RK3528A:

U-Boot 2025.07-rc1-OpenWrt-r30114-9b777547be (Jun 18 2025 - 18:35:23 +0000)

Model: Generic RK3528
SoC:   RK3528A
DRAM:  2 GiB
Core:  130 devices, 20 uclasses, devicetree: separate
MMC:   mmc at ffbf0000: 0, mmc at ffc30000: 1
Loading Environment from nowhere... OK
In:    serial at ff9f0000
Out:   serial at ff9f0000
Err:   serial at ff9f0000
Hit any key to stop autoboot:  0

[1] https://imgur.com/a/ddLsnmt

Thanks,
Chukun

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2.25.1