Embedded Linux USB WiFi-driven porting __linux

Hardware platform: Freescale MX258 Development Board

Operating system: Linux2.6.31

wifi:rt2860 USB WiFi Module

Cross-compilation environment: GCC version 4.1.2

Debugging steps:

The first step: testing the USB host interface

To set the USB host to kernel mode in Menuconfig:

After recompiling the kernel, start the Development board, insert the U disk and mount it:

Mount/dev/sda1/tmp

Ls/tmp

can see the U disk has been normal mount, test USB HOST ok!

Step two: Download Leiling the latest USB drive online,

2011_0107_rt3070_rt3370_linux_sta_v2[1].5.0.1_dpo.tar.bz2

Copy to Linux directory and unzip:

Tar jxf 2011_0107_rt3070_rt3370_linux_sta_v2[1].5.0.1_dpo.tar.bz2

Since the name above is very long, it can be modified to a short name:

MV 2011_0107_rt3070_rt3370_linux_sta_v2[1].5.0.1_dpo Rt3070_linux_sta

Step three: Enter the Rt3070_linux_sta directory and see a README_STA_USB file that describes how to load the driver:

=======================================================================

Build Instructions:

====================

1> $tar-xvzf dpb_rt2870_linux_sta_x.x.x.x.tgz

Go to "./dpb_rt2870_linux_sta_x.x.x.x" directory.

2> in Makefile

Set the "MODE = STA" in Makefile and chose the target to Linux by set "target = Linux"

Define the Linux kernel source include file path linux_src

Modify to meet your need.

3> in Os/linux/config.mk

Define the GCC and LD of the target machine

Define the compiler flags Cflags

Modify to meet your need.

* * Build for being controlled by NetworkManager or wpa_supplicant wext functions

Please set ' has_wpa_supplicant=y ' and ' has_native_wpa_supplicant_support=y '.

=> #>cd wpa_supplicant-x.x

=> #>./wpa_supplicant-dwext-ira0-c wpa_supplicant.conf-d

* * Build for being controlled by Wpasupplicant with Ralink Driver

Please set ' has_wpa_supplicant=y ' and ' has_native_wpa_supplicant_support=n '.

=> #>cd wpa_supplicant-0.5.7

=> #>./wpa_supplicant-dralink-ira0-c wpa_supplicant.conf-d

4> $make

# Compile driver Source code

# to fix ' error:too few arguments to Functionˉiwe_stream_add_event '

=> $patch-I os/linux/sta_ioctl.c.patch os/linux/sta_ioctl.c

5> $CP Rt2870sta.dat/etc/wireless/rt2870sta/rt2870sta.dat

6> load driver, go to "os/linux/" directory.

#[kernel 2.4]

# $/sbin/insmod RT2870STA.O

# $/sbin/ifconfig RA0 inet your_ip up

#[kernel 2.6]

# $/sbin/insmod Rt2870sta.ko

# $/sbin/ifconfig RA0 inet your_ip up

7> Unload Driver

$/sbin/ifconfig ra0 Down

$/sbin/rmmod Rt2870sta

Here go to "./dpb_rt2870_linux_sta_x.x.x.x" directory. That's the Rt3070_linux_sta directory we just unzipped. To modify the makefile file in this directory, the following only gives the modified section:

#PLATFORM = PC

PLATFORM = ralink_2880

Ifeq ($ (PLATFORM), ralink_2880)

LINUX_SRC =/HOME/LQM/SHARE/G360/KERNEL_KFB

Cross_compile =/opt/freescale/usr/local/gcc-4.1.2-glibc-2.5-nptl-3/arm-none-linux-gnueabi/bin/ arm-none-linux-gnueabi-

endif

Ifeq ($ (rt28xx_mode), Apsta)

Cp-f $ (Rt28xx_dir)/os/linux/rt$ (chipset) apsta.ko/tftpboot

Ifeq ($ (OSABL), YES)

Cp-f $ (Rt28xx_dir)/os/linux/rtutil$ (chipset) apsta.ko/tftpboot

Cp-f $ (Rt28xx_dir)/os/linux/rtnet$ (chipset) apsta.ko/tftpboot

endif

Else

Cp-f $ (Rt28xx_dir)/os/linux/rt$ (chipset) sta.ko/home/lqm/share/nfs/tmp

Note that while we are using the 2860 module, we can still define platform as ralink_2880, as long as the corresponding compilation environment is correct. LINUX_SRC represents the directory of the kernel, Corss_compile is a cross compilation environment, and the last line copies the generated KO file to the TMP Directory for NFS file systems after compiling.

Fourth step: According to the third step README_STA_USB give the hint, modify the Config.mk file, here also only give the modification part:

# Support Wpa_supplicant

Has_wpa_supplicant=y

# Support Native wpasupplicant for network Maganger

Has_native_wpa_supplicant_support=n

CC: =/OPT/FREESCALE/USR/LOCAL/GCC-4.1.2-GLIBC-2.5-NPTL-3/ARM-NONE-LINUX-GNUEABI/BIN/ARM-NONE-LINUX-GNUEABI-GCC

LD: =/opt/freescale/usr/local/gcc-4.1.2-glibc-2.5-nptl-3/arm-none-linux-gnueabi/bin/arm-none-linux-gnueabi-ld

Ifeq ($ (PLATFORM), ralink_2880)

Extra_cflags: =-d__kernel__-i$ (linux_src)/include-i$ (rt28xx_dir)/include-wall-wstrict-prototypes-wno-trigraphs- O2-fno-strict-aliasing-fno-common-uarm-fno-common-pipe-d__linux_arm_arch__=5-march=armv5te-msoft-float-uarm- Dmodule-dmodversions-include $ (LINUX_SRC)/include/config/modversions.h $ (wflags)

Export Extra_cflags

endif

Note that here CC is a cross compilation environment, and LD is a cross compiled link. The default extra_cflags is Cflags, which needs to be modified to extra_cflags, or the following error will be prompted at compile time:

SCRIPTS/MAKEFILE.BUILD:49: * * * cflags is changed in "/home/lqm/share/rt3070_linux_sta/os/linux/makefile". Fix it to use Extra_cflags. Stop it.

Linux_arm_arch must be set to 5,-march must be set up and CPU matching, because this is MX258, so set to ARMv5TE, can not be set to armv5t or ARMV5, otherwise the following error occurred:

CC [M]/home/lqm/share/rt3070_linux_sta/os/linux/. /.. /os/linux/rt_main_dev.o

{standard input}: Assembler messages:

{Standard input}:340:error:selected processor does not support ' PLD [R5, #0] '

{Standard input}:349:error:selected processor does not support ' PLD [R5, #0] '

MAKE[2]: * * * * [/home/lqm/share/rt3070_linux_sta/os/linux/. /.. /OS/LINUX/RT_MAIN_DEV.O] Error 1

MAKE[1]: * * * [_module_/home/lqm/share/rt3070_linux_sta/os/linux] Error 2

MAKE[1]: Leaving directory '/HOME/LQM/SHARE/G360/KERNEL_KFB '

Make: * * * * [LINUX] Error 2

[ROOT@LQM rt3070_linux_sta]#

Fifth step: Make

If the compilation works correctly, the Rt3070sta.ko file will be generated in the/rt3070_linux_sta/os/linux directory.

Step Sixth: Plug the USB WiFi module into the USB host port on the Development Board and Rt3070sta.ko