Thank you for your support. Yes, correct SDIO 0xA9A6 is BCM43430 I was confused by the naming of some firmware files. What firmware version/file shall be used for this chipset/driver combination? Currently I'am using the firmware file "fw_bcm43438a0_p2p.bin" from here https://github.com/BPI-SINOVOIP/BPI_WiFi_Firmware/tree/master/ap6212. I have set the driver parameter "use_p2p_group_interface=1" as you recommended, and now I see following error messages at the kernel log when I try to setup a P2P connection. [ 59.593565] brcmfmac: brcmf_sdio_hostmail: Unknown mailbox data content: 0x40012 [ 62.163452] brcmfmac: brcmf_sdio_bus_rxctl: resumed on timeout [ 62.169542] brcmfmac: brcmf_sdio_checkdied: firmware trap in dongle [ 62.175839] brcmfmac: brcmf_cfg80211_add_iface: add iface p2p-wlan0-0 type 8 failed: err=-110
