The Flipper One is finally official, but Flipper isn't selling it yet — they're asking for help to build it
… RK3576 isn't supported in upstream OP-TEE, and Rockchip's technical reference manual doesn't document the security hardware blocks. …
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Rockchip RK3576
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Rockchip RK3576
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For NanoPi R76S on Rockchip RK3576, OpenWrt 25.12 progress is being tracked via a FriendlyWrt source-gap analysis to pinpoint what backports are still missing.
Live sources:
OpenWrt Forum