Mux instructions
From IGEP - ISEE Wiki
Overview
Detailed instructions to configure mux. See this page for more information.
Feedback and Contributing
At any point, if you see a mistake you can contribute to this How-To.
Disable Peripherals
BT/WIFI
See FAQ to see with pins need to configure. More information about configure BT and WIFI
Bluetooth
First way:
This mode has a issue, when your system reboot or shutdown you will need to configure again. Using user space to configure mux and disable bluetooth.
Logging with root user via SSH or Serial cable.
Go to /sys/kernel/debug/omap_mux/
Set sdmmc2_dat5 to gpio137 (mode 4):
echo 0x004 > sdmmc2_dat5
Revise that:
root@localhost:/sys/kernel/debug/omap_mux# cat sdmmc2_dat5 name: sdmmc2_dat5.gpio_137 (0x48002166/0x136 = 0x0004), b ah3, t NA mode: OMAP_PIN_OUTPUT | OMAP_MUX_MODE4 signals: sdmmc2_dat5 | sdmmc2_dir_dat1 | cam_global_reset | sdmmc3_dat1 | gpio_137 | hsusb3_tll_stp | mm3_rxdp | safe_mode
Go to: /sys/class/gpio/
Check that gpio137 is in user space:
root@localhost:/sys/class/gpio# ls export gpio137 gpio138 gpio139 gpio170 gpio64 gpiochip0 gpiochip128 gpiochip160 gpiochip192 gpiochip32 gpiochip64 gpiochip96 unexport root@localhost:/sys/class/gpio#
If you don't have it, you should export gpio137:
echo 137 > /sys/class/gpio/export
Set gpio137 to low value to disable bluetooth:
echo 0 > /sys/class/gpio/gpio137/value
Revise that:
root@localhost:/sys/class/gpio# cat /sys/class/gpio/gpio137/value 0 root@localhost:/sys/class/gpio#
Second way:
Configure kernel sources. Configuration will be permanent. There are many ways to edit source code, this method is focused for igep0020 RC without igep0022 support.
Go to $(kernel path)/arch/arm/mach-omap2/board-igep0020.c and search next line:
else if (hwrev == IGEP2_BOARD_HWREV_C) igep00x0_wifi_bt_init(IGEP2_RC_GPIO_WIFI_NPD, IGEP2_RC_GPIO_WIFI_NRESET, IGEP2_RC_GPIO_BT_NRESET, !opt);
"igep00x0_wifi_bt_init" function initializes WIFI and Bluetooth peripherals. "opt" variable is used for disable Bluetooth in some cases: enabled (opt!=0) or disabled (opt==0). For example you can disable it permanently replacing "opt" by 1:
else if (hwrev == IGEP2_BOARD_HWREV_C) igep00x0_wifi_bt_init(IGEP2_RC_GPIO_WIFI_NPD, IGEP2_RC_GPIO_WIFI_NRESET, IGEP2_RC_GPIO_BT_NRESET, !1);
Compile kernel source code
Use this tutorial (Kernel) and this other (IGEPxloader) to install Linaro Headless with your custom kernel in SD card. You can compile the IGEPxloader, but is not necessary.
WIFI
First way:
This mode has a issue, when your system reboot or shutdown you will need to configure again. Using user space to configure mux and disable WIFI.
NOTE: If you need bluetooth activate, configure it before disable WIFI. Follow this tutorial.
Logging with root user via SSH or Serial cable.
Go to /sys/kernel/debug/omap_mux/
Set sdmmc2_dat6 to gpio138 (mode 4):
echo 0x004 > sdmmc2_dat7
Revise that:
root@localhost:/sys/kernel/debug/omap_mux# cat sdmmc2_dat7 name: sdmmc2_dat7.gpio_139 (0x4800216a/0x13a = 0x0004), b ae3, t NA mode: OMAP_PIN_OUTPUT | OMAP_MUX_MODE4 signals: sdmmc2_dat7 | sdmmc2_clkin | NA | sdmmc3_dat3 | gpio_139 | hsusb3_tll_nxt | mm3_rxdm | safe_mode root@localhost:/sys/kernel/debug/omap_mux#
Go to: /sys/class/gpio/
Check that gpio139 is in user space:
root@localhost:/sys/class/gpio# ls export gpio137 gpio138 gpio139 gpio170 gpio64 gpiochip0 gpiochip128 gpiochip160 gpiochip192 gpiochip32 gpiochip64 gpiochip96 unexport root@localhost:/sys/class/gpio#
If you don't have it, you should export gpio139:
echo 139 > /sys/class/gpio/export
Set gpio139 to low value to disable bluetooth:
echo 0 > /sys/class/gpio/gpio139/value
Revise that:
root@localhost:/sys/class/gpio# cat /sys/class/gpio/gpio139/value 0 root@localhost:/sys/class/gpio#
Second way :
Configure kernel sources. Configuration will be permanent. There are many ways to edit source code, this method is focused for igep0020 RC without igep0022 support.
Go to $(kernel path)/arch/arm/mach-omap2/board-igep00x0.c and search next line:
if ((gpio_request(wifi_nreset, "WIFI NRESET") == 0) && (gpio_direction_output(wifi_nreset, 1) == 0)) { gpio_export(wifi_nreset, 0); gpio_set_value(wifi_nreset, 0); udelay(10); gpio_set_value(wifi_nreset, 1); } else
"igep00x0_wifi_bt_init" function initializes WIFI and Bluetooth peripherals, this code make a PWM to initialize WIFI. Edit lines to disable this initialization.
if ((gpio_request(wifi_nreset, "WIFI NRESET") == 0) && (gpio_direction_output(wifi_nreset, 0) == 0)) { gpio_export(wifi_nreset, 0); } else
Compile kernel source code
Use this tutorial (Kernel) and this other (IGEPxloader) to install Linaro Headless with your custom kernel in SD card. You can compile the IGEPxloader, but is not necessary.
TP65950 PCM VSP
Disable BT audio
Default kernel has disabled TWL4030 PCM voice interface output pins to high impedance, otherwise this module forces the level of mcbsp3_fsx and mcbsp3_clkx pins. To make sure, go to $(kernel path)/sound/soc/codecs/twl4030.c file already read:
0x04, /* REG_VOICE_IF (0xF) */
Enable BT audio
0x00, /* REG_VOICE_IF (0xF) */
Edit mux
UART1 in J990
Use ebuddies to configure UART1 in J990, go to igep.ini:
board.ei485= [yes, no] Format: <string> no: disable ei485, use UART1 as RS232, supported by igep0020 default: yes
More information about RS485 here and here
You can test new configuration using this tutorial
GPIO in J990
Reset WIFI, BT or TPS if you use some pad shared with this connector, more information here.
Configure GPIO, don't use these GPIO in IGEP WIFI/BT versions.
Use this manual to configure mux via user space
Edit $(kernel path)/arch/arm/mach-omap2/board-igep00x0.c or $(kernel path)/arch/arm/mach-omap2/board-igep0020.c to configure GPIO via Kernel source, example here.
GPIO in JTAG
Not all JTAG pins have GPIO, more information here.
Use this manual to configure mux via user space
Edit $(kernel path)/arch/arm/mach-omap2/board-igep00x0.c or $(kernel path)/arch/arm/mach-omap2/board-igep0020.c to configure GPIO via Kernel source, example here.
GPIO in JC30
Not all JC30 pins have GPIO, more information here.
Use this manual to configure mux via user space
Edit $(kernel path)/arch/arm/mach-omap2/board-igep00x0.c or $(kernel path)/arch/arm/mach-omap2/board-igep0020.c to configure GPIO via Kernel source, example here.
GPIO in JA42
Not all JA42 pins have GPIO, more information here. Some pads are shared with TFP410
Use this manual to configure mux via user space.
Edit $(kernel path)/arch/arm/mach-omap2/board-igep00x0.c or $(kernel path)/arch/arm/mach-omap2/board-igep0020.c to configure GPIO via Kernel source, example here.
GPIO in JA41
Not all JA41 pins have GPIO, more information here. Some pads are shared with TFP410 and TXS0102DCUR
Use this manual to configure mux via user space.
Edit $(kernel path)/arch/arm/mach-omap2/board-igep00x0.c or $(kernel path)/arch/arm/mach-omap2/board-igep0020.c to configure GPIO via Kernel source, example here.
GPIO in TP
Some GPIOs avaliable in TP:
Default peripheral (mode=0) |
GPIO (mode=4) |
TP |
gpmc_ncs1 | gpio_52 | TP303 |
gpmc_ncs2 | gpio_53 | TP304 |
gpmc_ncs3 | gpio_54 | TP305 |
gpmc_ncs4 | gpio_55 | TP306 |
gpmc_ncs6 | gpio_57 | TP307 |
gpmc_ncs7 | gpio_58 | TP318 |
gpmc_clk | gpio_59 | TP308 |
gpmc_nwp | gpio_62 | TP312 |
gpmc_wait1 | gpio_63 | TP313 |
gpmc_wait3 | gpio_65 | TP315 |
mmc1_dat6 | gpio_128 | TP902 |
etk_d11 | gpio_25 | TP405 |
NOTE: There are more GPIO, but they are only an input (and not an output) and others GPIO the usage is strongly restricted.
Use this manual to configure mux via user space.
Edit $(kernel path)/arch/arm/mach-omap2/board-igep00x0.c or $(kernel path)/arch/arm/mach-omap2/board-igep0020.c to configure GPIO via Kernel source, example here.
Under construction