1. 前言
使用WiFi板与Jetson Xavier NX模块连接调试。 模块是BCM43455模块，使用的是SDIO接口。
dts定义如下：
sdhci@3440000 { #address-cells = <1>; #size-cells = <0>; compatible = “nvidia,tegra194-sdhci”; reg = <0x0 0x3440000 0x0 0x00020000>; interrupts = < 0 TEGRA194_IRQ_SDMMC3 0x04>; iommus = <&smmu TEGRA_SID_SDMMC3A>; dma-coherent; max-clk-limit = <208000000>; bus-width = <4>; cap-mmc-highspeed; cap-sd-highspeed; sd-uhs-sdr104; sd-uhs-sdr50; sd-uhs-sdr25; sd-uhs-sdr12; mmc-ddr-1_8v; mmc-hs200-1_8v; cd-inverted; nvidia,min-tap-delay = <96>; nvidia,max-tap-delay = <139>; nvidia,vqmmc-always-on; pwrdet-support; pinctrl-names = “sdmmc_e_33v_enable”, “sdmmc_e_33v_disable”; pinctrl-0 = <&sdmmc3_e_33V_enable>; pinctrl-1 = <&sdmmc3_e_33V_disable>; ignore-pm-notify; resets = <&bpmp_resets TEGRA194_RESET_SDMMC3>; reset-names = “sdhci”; pll_source = “pll_p”, “pll_c4_muxed”; nvidia,set-parent-clk; nvidia,parent_clk_list = “pll_p”, “pll_p”, “pll_p”, “pll_p”, “pll_p”, “pll_c4_muxed”, “pll_c4_muxed”, “pll_c4_muxed”, “pll_c4_muxed”, “pll_c4_muxed”, “NULL”; clocks = <&bpmp_clks TEGRA194_CLK_SDMMC3>, <&bpmp_clks TEGRA194_CLK_PLLP_OUT0>, <&bpmp_clks TEGRA194_CLK_PLLC4_MUXED>, <&bpmp_clks TEGRA194_CLK_SDMMC_LEGACY_TM>; clock-names = “sdmmc”, “pll_p”, “pll_c4_muxed”, “sdmmc_legacy_tm”; uhs-mask = <0x08>; nvidia,en-periodic-calib; status = “okay”; brcmf: wifi@0 { reg = <0>; compatible = “brcm,bcm4329-fmac”; }; };<
sdhci正常注册
[ 5.285300] sdhci-tegra 3440000.sdhci: Client registration for eMC Successful但WiFi模块探测本身没有发生
WIFI固件如下
~$ ls -l /lib/firmware/brcm/brcmfmac43455-sdio.bin -rw-r–r– 1 root root 488193 Mar 30 2017 /lib/firmware/brcm/brcmfmac43455-sdio.bin开启内核配置
CONFIG_CFG80211=y CONFIG_BRCMUTIL=y CONFIG_BRCMFMAC=y CONFIG_BRCMFMAC_SDIO=y 2. 查询 driver & dmesg & 硬件（1）/sys/bus/sdio/drivers
$ ls -l /sys/bus/sdio/drivers total 0 drwxr-xr-x 2 root root 0 Sep 24 14:04 brcmfmac $ ls -l /sys/bus/sdio/devices total 0（2）查询dmesg
可能SDIO没有被枚举出来 问题不是fw或客户端驱动程序 这是TX2上的sdio wifi日志
[ 1.461159] sdhci-tegra 3440000.sdhci: Client registration for eMC Successful [ 1.506029] mmc1: SDHCI controller on 3440000.sdhci [3440000.sdhci] using ADMA 64-bit with 64 bit addr [ 1.757516] mmc1: hw tuning done … [ 1.761158] mmc1: new ultra high speed SDR104 SDIO card at address 0001（3）检测硬件 在启动时能看到时钟
原理图
提到Xavier系列不支持SDIO wifi
我们的软件不验证任何类型的wifi卡在Xavier系列芯片上的SDIO， 我们没有这样做的计划。 因此，你仍然可以尝试，但我们可能不会提供太多经验，因 为它也没有经过我们这边的验证。 只有TX1和TX2是验证过sdio WiFi的。 我不能给你一个明确的“是”或“否”的答案，因为这是我们尚未核实的事情， 目前也没有相关计划。 也许其他用户也有成功的经验。 但是从官方支持的角度来看，我们建议用户在Xavier系列中使用Wifi而不是SDIO 4. 调试记录（1）修改sdhci 设备树
sdhci@700b0400 { /* SDMMC3 for Wifi */ #address-cells = <1>; #size-cells = <0>; force-non-removable-rescan; non-removable; status = “okay”; brcmf: brcmf@0 { reg = <0>; compatible = “brcm,bcm4329-fmac”; }; };有时我在mmc1上得到这个错误，
[ 5.466191] mmc1: CMD CRC or end bit error, int mask 0xc0001 [ 5.466589] mmc1: CMD CRC or end bit error, int mask 0xc0000 [ 5.466987] mmc1: CMD CRC or end bit error, int mask 0xc0000 [ 5.467382] mmc1: CMD CRC or end bit error, int mask 0xc0000（2）是否使用一个永远开机的电源作为wifi模块的VIN 当“WL_REG_ON”变高时，启用VIN_LDO (1.3v)
（3）系统启动时是否启用GPIO12 (WL_REG_ON) ? 是的，系统启动时启用GPIO12 (WL_REG_ON)
我在dts中这样定义，以便在引导时启用GPIO12
gpio: gpio@6000d000 { wlan-output-high { gpio-hog; output-high; gpios = <TEGRA_GPIO(Y, 2) GPIO_ACTIVE_HIGH>; label = “wlan-out-high”; }; }SDIO时钟只在启动时被看到 GPIO12(WL_REG_ON)-在SDIO时钟激活前启用 仍然没有枚举SDIO和WiFi客户端驱动程序探测没有发生
[ 1.595331] mmc1: new ultra high speed SDR104 SDIO card at address 0001 and WiFi client driver probe is happening（4）dts只设置成1.8v
WiFi加载正常
我可以在Jetson Nano上打开wifi，但同样的驱动程序在Xavier NX上不能工作 错误如下：
[ 8.279684] brcmfmac: brcmf_cfg80211_reg_notifier: not a ISO3166 code (0x30 0x30) [ 11.551637] brcmfmac: brcmf_cfg80211_reg_notifier: not a ISO3166 code (0x30 0x30) [ 14.166818] brcmfmac: brcmf_proto_bcdc_query_dcmd: brcmf_proto_bcdc_msg failed w/status -110 [ 17.494892] brcmfmac: brcmf_proto_bcdc_query_dcmd: brcmf_proto_bcdc_msg failed w/status -110 [ 17.495084] brcmfmac: brcmf_cfg80211_get_channel: chanspec failed (-110) [ 23.386799] brcmfmac: brcmf_proto_bcdc_query_dcmd: brcmf_proto_bcdc_msg failed w/status -110 [ 23.386994] brcmfmac: brcmf_cfg80211_get_tx_power: error (-110) [ 26.454885] brcmfmac: brcmf_do_escan: error (-110) [ 26.455009] brcmfmac: brcmf_cfg80211_scan: scan error (-110) [ 27.443516] brcmfmac: brcmf_run_escan: error (-4) [ 27.443643] brcmfmac: brcmf_cfg80211_scan: scan error (-4) [ 80.215022] brcmfmac: _brcmf_set_multicast_list: Setting mcast_list failed, -110 [ 105.302828] brcmfmac: brcmf_proto_bcdc_query_dcmd: brcmf_proto_bcdc_msg failed w/status -110 [ 105.303017] brcmfmac: brcmf_cfg80211_get_channel: chanspec failed (-110) [ 315.990889] brcmfmac: brcmf_do_escan: error (-110) [ 315.991134] brcmfmac: brcmf_cfg80211_scan: scan error (-110) [ 386.088003] brcmfmac: brcmf_run_escan: error (-4) [ 386.088224] brcmfmac: brcmf_cfg80211_scan: scan error (-4)Wlan0正常，但我不能连接任何wifi网络
$ ifconfig wlan0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 ether 48:eb:62:c0:f0:87 txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 $ nmcli device wifi list IN-USE SSID MODE CHAN RATE SIGNAL BARS SECURITY arunkumar Infra 4 270 Mbit/s 37 ▂▄__ WPA2（5）检查syslog
[ 368.989771] ieee80211 phy0: brcmf_escan_timeout: timer expired [ 376.575141] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready [ 386.909776] ieee80211 phy0: brcmf_escan_timeout: timer expired [ 414.301765] ieee80211 phy0: brcmf_escan_timeout: timer expired [ 444.720654] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready [ 455.005784] ieee80211 phy0: brcmf_escan_timeout: timer expired [ 473.437767] ieee80211 phy0: brcmf_escan_timeout: timer expired [ 488.406253] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready 5. 解决办法修改sdhci为如下：
sdhci@3440000 { #address-cells = <1>; #size-cells = <0>; non-removable; force-non-removable-rescan; no-sd; max-clk-limit = <25000000>; only-1-8-v; status = “okay”; brcmf: brcmf@0 { reg = <0>; compatible = “brcm,bcm4329-fmac”; }; };并使用最新的brcmfmac驱动程序 地址如下：
https://community.cypress.com/t5/Resource-Library/Cypress-Linux-WiFi-Driver-Release-FMAC-2020-09-25/ta-p/251089
