I've built Armbain (5.4.17-rockchip64) from sources with additing the next options CONFIG_BT_HCIUART_SERDEV=y,  CONFIG_BT_HCIUART_H4=y, CONFIG_BT_HCIUART_BCM=y to linux-rockchip64-current.config. And bluetooth is working.   brcm_patchram_plus_rk3399[1446]: Done setting baudrate Feb 3 20:28:32 localhost kernel: [ 99.787745] Bluetooth: Core ver 2.22 Feb 3 20:28:32 localhost kernel: [ 99.787784] NET: Registered protocol family 31 Feb 3 20:28:32 localhost kernel: [ 99.787787] Blu
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