¶ NVMe SSD
If your board has the M2.KEYM interface, then you can connect an NVMe SSD for use.
root@OpenWrt:/# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
mtdblock0 31:0 0 128M 0 disk
mtdblock1 31:1 0 1M 1 disk
mtdblock2 31:2 0 512K 0 disk
mtdblock3 31:3 0 4M 0 disk
mtdblock4 31:4 0 2M 0 disk
mtdblock5 31:5 0 112.5M 0 disk
mmcblk0 179:0 0 7.3G 0 disk
├─mmcblk0p1 179:1 0 256.3M 0 part
└─mmcblk0p2 179:2 0 7G 0 part
mmcblk0boot0 179:8 0 4M 1 disk
mmcblk0boot1 179:16 0 4M 1 disk
ubiblock0_1 253:0 0 59.7M 0 disk /rom
nvme0n1 259:0 0 119.2G 0 disk
root@OpenWrt:/# lspci
0002:00:00.0 PCI bridge: MEDIATEK Corp. Device 7988 (rev 01)
0002:01:00.0 Non-Volatile memory controller: SK hynix Gold P31 SSD
0004:00:00.0 Unclassified device [0002]: MEDIATEK Corp. Device 7981