[root@luckfox root]# hciattach -s 1500000 /dev/ttyS1 any 1500000 flow nosleep&
[root@luckfox root]# [ 56.054692] of_dma_request_slave_channel: dma-names property of node '/serial@ff4b0000' missing or empty
Device setup complete
[ 56.054730] dw-apb-uart ff4b0000.serial: failed to request DMA, use ...

[root@luckfox root]# hciconfig hci0 leadv
LE set advertise enable on hci0 returned status 12