gistfile1.txt

Allwinner SoCs feature something called a SID (Security ID) which should be available with
mainline kernel as /sys/bus/nvmem/devices/sunxi-sid0/nvmem. From the first bytes the SoC
model might be detectable once the SIDs are known. Unfortunately information in linux-sunxi
wiki is/was a bit sparse and outdated: https://linux-sunxi.org/SID_Register_Guide
The following list is based on linux-sunxi wiki contents and complemented with own checks
(crawling through sbc-bench submissions and conducting tests on own devices).

SoCs are sorted by chip ID, starting with 'old scheme':

A10 (1623)      162367*              --> 1623*
A10s (1625)     162541*              \__ following the old ID scheme it's
A13/R8 (1625)   162541*, 162542*     /   simply 1625* for all A10s/A13/R8
A31/A31s (1633) 16524251, 16554144   --> with these SoCs the SID is stored in the PMIC
                                         (AXP221 or AXP221s, most probably their chip
                                         IDs are 1652 and 1655, see also R40 below)
A20 (1651)      165165*, 165166*     --> 1651*
R40/V40 (1701)  16554153             --> that's 1st part of Serial number on all BPi-M2
                                         Ultra/Berry which both rely on AXP221s

new SID scheme (SID not starting with chip ID any longer)

A33/R16 (1667)  0461872a
A83T (1673)     32c0040?: 32c00401 (87%), 32c00403 (13%)
H2+ (1680)      02c00?42: 02c00042 (79%), 02c00142 (11%), 02c00242 (0.4%)
H3 (1680)       02c00?81: 02c00081 (91%), 02c00181 (9%)
V3s (1681)      12c00000
S3 (1681)       12c00001
A64 (1689)      92c00?ba: 92c000ba, 92c001ba <- https://archive.ph/mpiHO#selection-317.39-317.74 / https://archive.ph/CM9Oy#selection-1279.39-1279.74
H64 (1689)      92c000bb
R40/V40 (1701)  12c00017
H5 (1718)       82800001
H6 (1728)       82c0000?: 82c00001 (40%), 82c00007 (60%)
H313 (1823)     32c05c00 (Tanix TX1)
H616 (1823)     32c05000 (OPi Zero 2 / X96 Mate)
H618 (1823)     33802000 (OPi Zero 2W / OrangePi Zero3 / Transpeed 8K618-T)
H700 (1823)     33806c00 (Anbernic RG35XX)
T527 (1890)     03005f30 (Sipeed LM4B with M00X0DCH variant)