Hi, When upgrading my devel environment to 4.13-rc1+ I noticed that the brcm43430 sdio wifi on a Chuwi Hi8 plus stopped working: jul 22 14:13:23 localhost.localdomain kernel: brcmfmac: brcmf_sdio_probe: Loading firmware brcm/brcmfmac43430-sdio.bin for chip 0000a9a6 rev 00000001 jul 22 14:13:23 localhost.localdomain kernel: usbcore: registered new interface driver brcmfmac jul 22 14:13:23 localhost.localdomain kernel: brcmfmac: brcmf_c_preinit_dcmds: Firmware version = wl0: Aug 29 2016 20:48:16 version 7.45.41.26 (r640327) FWID 01-4527cfab jul 22 14:13:23 localhost.localdomain kernel: brcmfmac: brcmf_sdio_hostmail: Unknown mailbox data content: 0x40012 jul 22 14:13:26 localhost.localdomain kernel: brcmfmac: brcmf_sdio_bus_rxctl: resumed on timeout jul 22 14:13:28 localhost.localdomain kernel: brcmfmac: brcmf_sdio_bus_rxctl: resumed on timeout jul 22 14:13:31 localhost.localdomain kernel: brcmfmac: brcmf_sdio_bus_rxctl: resumed on timeout <repeats> The real culprit here seems to be: jul 22 14:13:23 localhost.localdomain kernel: brcmfmac: brcmf_sdio_hostmail: Unknown mailbox data content: 0x40012 I've tried reverting allmost all changes under drivers/net/wireless/broadcom/brcm80211 as well as those under drivers/mmc, but that did not help. Googling for the "Unknown mailbox data content" error found some Raspberry Pi 3 related comments where users report success with a different firmware version from: https://android.googlesource.com/platform/hardware/broadcom/wlan/+/master/bcmdhd/firmware/bcm4343/ So I tried that as well as a version extracted from the Android install on the tablet and both work fine, only the "version 7.45.41.26" which happens to be the one in linux-firmware causes this problem, I've put all (Linux build, not NDIS) versions I could find here: http://jwrdegoede.danny.cz/brcm-firmware/ I've the feeling that the 7.45.41.26 version is a bit buggy / suspect to certain timing problems and 4.13 just happens to trigger those timing conditions... russianneuromancer has reported seeing a similar problem with 4.13. russianneuromancer, can you check if the device you are seeing this with also has a brcm43430 sdio wifi and if so if switching to: http://jwrdegoede.danny.cz/brcm-firmware/brcmfmac43430-sdio.bin.7.45.77.0.ucode1043.2054 Fixes this ? Regards, Hans
