GL-AR300M - Compile images for NAND?

[tmomas]

NAND support is available only in snapshots.

Updating a GL.iNet GL-AR300M, arch change

You must be using the manufacturer's custom OpenWrt 18.xx if you are booting from NAND. Official NAND support is now in snapshot, as you have found and will be in 20.xx. However kernel 5.x is much bigger. Fortunately the standard uboot can handle this (both early and later versions) but sysupgrade from 18.xx cannot. AFAIK No.

See also

• https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=5fc63ec8a496066d101de41ae4f820c5c4e39c04
• https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=55e6c903ae20bd8e694f4626166766e59602f87c