Dears, I working on adding support in mainline kernel for radxa-zero SBC. https://www.cnx-software.com/2021/06/16/radxa-zero-sbc-quad-core-raspberry-pi-zero-w-alternative/ So far all seems to be working well on mainline 5.13.4 kernel except WiFi. radxa-zero SBC uses SDIO attached AP6256 WiFi/BT module. Chip seems to be communicating with brcmfmac driver - but kernel dmesg reports error like below. (output is after kernel compile with: CONFIG_BRCM_TRACING=y CONFIG_BRCMDBG=y and echo 8 > /proc/sys/kernel/printk modprobe brcmfmac debug=0x6) 5.13.4 dmesg from brcmfmac probing: [ 138.188502] brcmfmac: brcmfmac_module_init No platform data available. [ 138.189917] brcmfmac: brcmf_sdio_probe Enter [ 138.194049] brcmfmac: F1 signature read @0x18000000=0x15294345 [ 138.199709] brcmfmac: brcmf_chip_recognition found AXI chip: BCM4345/9 [ 138.207838] brcmfmac: brcmf_chip_cores_check [1 ] core 0x800:51 base 0x18000000 wrap 0x18100000 [ 138.214720] brcmfmac: brcmf_chip_cores_check [2 ] core 0x812:54 base 0x18001000 wrap 0x18101000 [ 138.223405] brcmfmac: brcmf_chip_cores_check [3 ] core 0x83e:9 base 0x18002000 wrap 0x18102000 [ 138.232112] brcmfmac: brcmf_chip_cores_check [4 ] core 0x83c:14 base 0x18003000 wrap 0x18103000 [ 138.240834] brcmfmac: brcmf_chip_cores_check [5 ] core 0x829:21 base 0x18004000 wrap 0x18104000 [ 138.249534] brcmfmac: brcmf_chip_cores_check [6 ] core 0x135:0 base 0x00000000 wrap 0x18107000 [ 138.258248] brcmfmac: brcmf_chip_cores_check [7 ] core 0x240:0 base 0x00000000 wrap 0x00000000 [ 138.266957] brcmfmac: brcmf_chip_set_passive Enter [ 138.274227] brcmfmac: brcmf_chip_get_raminfo RAM: base=0x198000 size=0 (0x0) sr=0 (0x0) [ 138.279634] brcmfmac: brcmf_chip_get_raminfo: RAM size is undetermined [ 138.286085] brcmfmac: brcmf_sdio_probe_attach: brcmf_chip_attach failed! [ 138.292725] brcmfmac: brcmf_sdio_probe: brcmf_sdio_probe_attach failed [ 138.299190] brcmfmac: brcmf_sdio_remove Enter [ 138.303476] brcmfmac: brcmf_detach Enter [ 138.307444] brcmfmac: brcmf_sdio_remove Disconnected [ 138.312361] brcmfmac: brcmf_ops_sdio_probe: F2 error, probe failed -19... [ 138.319198] usbcore: registered new interface driver brcmfmac i tested fw ver 7.45.96.61 and also a bit newer ver. (7.45.96.68). both are giving the same error. removing firmware changes nothing - so i think issue is in frcmfmac kernel code which is not ready yet for chip variant used in radxa-zero ap6256 wifi module. Full kernel dmesg: https://pastebin.com/VT1tQUJY May you pls advise me how to move forward with this issue?
