On the device side, the WLAN MAC is responsible for the 802.11 MAC functions, and conveys WLAN packets from/to the external host to/from the FW.The MAC is responsible for the timing and the time critical decisions only.The PHY performs the 802.11 PHY functions of encoding/decoding and modulation/demodulation, and is responsible for the RF functions of up/down modulation to carrier frequency, filtering and amplification.
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In the Linux kernel a command of the form: Note: As we are using compat-wireless, most of the mac80211 and bluetooth related switches are bot needed in the kernel .config file.
Note: CONFIG_REGULATOR_FIXED_VOLTAGE=y for AM37x platform and not needed for AM18x and AM335x platforms.
Make sure that the following build kernel options are disabled in the .config file in order to disable the WLAN Kernel support,so the Kernel modules for WLAN will be provided from the backport components and not from the Kernel distribution itself.# # Network testing # # MAC 80211 CONFIG_WLAN=y CONFIG_WIRELESS=y CONFIG_WIRELESS_EXT=y CONFIG_WL12XX_PLATFORM_DATA=y CONFIG_KEYS=y CONFIG_SECURITY=y CONFIG_CRYPTO=y CONFIG_CRYPTO_ARC4=y CONFIG_CRYPTO_ECB=y CONFIG_CRYPTO_AES=y CONFIG_CRYPTO_MICHAEL_MIC=y CONFIG_CRYPTO_RNG=y CONFIG_CRYPTO_AEAD=y CONFIG_CRYPTO_CCM=y CONFIG_CRYPTO_GCM=y CONFIG_RFKILL=y CONFIG_REGULATOR_FIXED_VOLTAGE=y CONFIG_CRC7=y # The following are needed for soft AP CONFIG_NETFILTER=y CONFIG_NETFILTER_ADVANCED=y CONFIG_NF_CONNTRACK=y CONFIG_NETFILTER_XTABLES=y CONFIG_NF_DEFRAG_IPV4=y CONFIG_NF_CONNTRACK_IPV4=y CONFIG_NF_CONNTRACK_PROC_COMPAT=y CONFIG_IP_NF_IPTABLES=y CONFIG_IP_NF_FILTER=y CONFIG_IP_NF_TARGET_LOG=y CONFIG_NF_NAT=y CONFIG_NF_NAT_NEEDED=y CONFIG_IP_NF_TARGET_MASQUERADE=y CONFIG_INPUT_UINPUT=y # Enable Ethernet-WLAN Bridge CONFIG_NETFILTER=y CONFIG_NETFILTER_ADVANCED=y CONFIG_BRIDGE_NETFILTER=y CONFIG_STP=y CONFIG_BRIDGE=y CONFIG_BRIDGE_IGMP_SNOOPING=y CONFIG_LLC=y CONFIG_INPUT_UINPUT=y CONFIG_HAS_IOMEM=y CONFIG_HAS_IOPORT=y CONFIG_HAS_DMA=y CONFIG_NLATTR=y CONFIG_AVERAGE=y Note: In case there are missing kernel switches like CONFIG_WL12XX_PLATFORM_DATA, then there probably is a missing part in the kernel that relates to the WL127x chipset, and patches should be applied.
Script usage As explained before, this presentation assumes AM335x machine type (arch/arm/boot/dts/am335x-evm.dts), but similar initialization is needed for every new platform which is connecting to the same type of Wi Link module.
The above entry needs to be made in the am33xx_pinmux: [email protected] node.
Note: For SDK8 (or processor SDK 188.8.131.52) and older AM335x releases, the serial driver used is OMAP_SERIAL (/dev/tty Ox) which requires the following (kernel) patch: https://com/gf/download/frsrelease/1298/7911/0001-OMAP-SERIAL-Enable-HW-flow-control.patch Newer SDKs use 8250 driver (through /dev/tty Sx).
This is done by registering a GPIO with the MMC device that is enabled (high) when the inteface is brought up and is disabled (low) when the interface is brought down.
Normally this is done using a Using a fixed voltage regulator In kernels that support device tree ( "CONFIG_OF=y" ), the supported power control option is via using a voltage regulator.
The set power option is not supported with device tree.