Difference between revisions of "Mux instructions"
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= Overview = | = Overview = | ||
− | + | This wiki page has more detailed information about mux on IGEPv2. <br> | |
+ | Read general [[Mux configuration|'Mux configuration' page]] before use it. This article contains: <br> | ||
− | + | *How-to disable some external peripherals to avoid interferences | |
+ | *Some detailed examples. | ||
− | = | + | = Disable Peripherals = |
+ | |||
+ | Some connectors share multiple peripherals like OMAP, WIFI/BT combo, etc. You should disable unused peripherals to avoid interferences. For example: if you want to control WIFI module via J990 disable OMAP or if you want use [[How to set up UART2 in J990|UART2 at j990]] disable Bluetooth. See schematics or [[Connectors Summary|connectors summary]] for more information. | ||
+ | |||
+ | === BT/WIFI Combo === | ||
− | + | Bluetooth and WIFI can be disabled separately with reset pins: RESET_N_W (for WIFI) in pad 47 and RST_N_B (for Bluetooth) in pad 16: | |
− | = | + | *RESET_N_W/RST_N_B=0: Enabled reset |
+ | *RESET_N_W/RST_N_B=1: Disabled reset | ||
− | + | Use GPIO to control it. See [[Frequently Asked Questions and Their Answers|FAQs]] to know which GPIO needs to be used. | |
− | + | {| cellspacing="1" cellpadding="1" border="1" align="center" width="200" | |
+ | |- | ||
+ | | [[Image:WIFI-BT Schematic.png|400x277px]] | ||
+ | |} | ||
− | + | Click to enlarge image<br> | |
==== Bluetooth ==== | ==== Bluetooth ==== | ||
+ | |||
+ | There are two ways to disable Bluetooth. More information about [[How to setup Marvell bluetooth|Bluetooth]] | ||
===== First way: ===== | ===== First way: ===== | ||
Line 25: | Line 37: | ||
Logging with root user via SSH or Serial cable.<br> | Logging with root user via SSH or Serial cable.<br> | ||
+ | NOTE: Poky distribution does not have debug filesystem enabled. Mount it: | ||
+ | <pre>mount -t debugfs none /sys/kernel/debug</pre> | ||
Go to /sys/kernel/debug/omap_mux/<br> | Go to /sys/kernel/debug/omap_mux/<br> | ||
Line 67: | Line 81: | ||
'''Compile kernel source code''' | '''Compile kernel source code''' | ||
− | Use this [[Linux Kernel 2.6.35.y|tutorial]] (Kernel) and this [http://labs.igep.es/index.php/The_IGEP_X-loader other] (IGEPxloader) to install Linaro Headless with your custom kernel in SD card. You can compile the IGEPxloader, but is not necessary.<br> | + | Use this [[Linux Kernel 2.6.35.y|tutorial]] (Kernel) and this [http://labs.igep.es/index.php/The_IGEP_X-loader other] (IGEPxloader) to install Linaro Headless (or Poky) with your custom kernel in SD card. You can compile the IGEPxloader, but is not necessary.<br> |
==== WIFI ==== | ==== WIFI ==== | ||
+ | |||
+ | There are two ways to disable WIFI. More information about [[How to setup Marvell 88w8686 SDIO wifi|WIFI]] | ||
===== First way: ===== | ===== 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. | + | 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. If you need bluetooth activate, configure it before disable WIFI. Follow [[How to setup Marvell bluetooth|this tutorial]]. |
− | |||
− | |||
Logging with root user via SSH or Serial cable.<br> | Logging with root user via SSH or Serial cable.<br> | ||
+ | NOTE: Poky distribution does not have debug filesystem enabled. Mount it: | ||
+ | <pre>mount -t debugfs none /sys/kernel/debug</pre> | ||
Go to /sys/kernel/debug/omap_mux/<br> | Go to /sys/kernel/debug/omap_mux/<br> | ||
Set sdmmc2_dat6 to gpio138 (mode 4): | Set sdmmc2_dat6 to gpio138 (mode 4): | ||
− | <pre>echo 0x004 > | + | <pre>echo 0x004 > sdmmc2_dat7</pre> |
Revise that: | Revise that: | ||
− | <pre>root@localhost:/sys/kernel/debug/omap_mux# cat | + | <pre>root@localhost:/sys/kernel/debug/omap_mux# cat sdmmc2_dat7 |
− | name: | + | name: sdmmc2_dat7.gpio_139 (0x4800216a/0x13a = 0x0004), b ae3, t NA |
mode: OMAP_PIN_OUTPUT | OMAP_MUX_MODE4 | mode: OMAP_PIN_OUTPUT | OMAP_MUX_MODE4 | ||
− | signals: | + | signals: sdmmc2_dat7 | sdmmc2_clkin | NA | sdmmc3_dat3 | gpio_139 | hsusb3_tll_nxt | mm3_rxdm | safe_mode |
root@localhost:/sys/kernel/debug/omap_mux# | root@localhost:/sys/kernel/debug/omap_mux# | ||
</pre> | </pre> | ||
Go to: /sys/class/gpio/ | Go to: /sys/class/gpio/ | ||
− | Check that | + | Check that gpio139 is in user space: |
<pre>root@localhost:/sys/class/gpio# ls | <pre>root@localhost:/sys/class/gpio# ls | ||
− | export | + | export gpio137 gpio138 gpio139 gpio170 gpio64 gpiochip0 gpiochip128 gpiochip160 gpiochip192 gpiochip32 gpiochip64 gpiochip96 unexport |
− | |||
− | |||
root@localhost:/sys/class/gpio# | root@localhost:/sys/class/gpio# | ||
</pre> | </pre> | ||
− | If you don't have it, you should export | + | If you don't have it, you should export gpio139: <br> |
− | <pre>echo | + | <pre>echo 139 > /sys/class/gpio/export </pre> |
− | Set | + | Set gpio139 to low value to disable bluetooth: |
− | <pre>echo 0 > /sys/class/gpio/ | + | <pre>echo 0 > /sys/class/gpio/gpio139/value</pre> |
Revise that: | Revise that: | ||
− | <pre>root@localhost:/sys/class/gpio# cat /sys/class/gpio/ | + | <pre>root@localhost:/sys/class/gpio# cat /sys/class/gpio/gpio139/value |
0 | 0 | ||
root@localhost:/sys/class/gpio# | root@localhost:/sys/class/gpio# | ||
</pre> | </pre> | ||
− | ===== Second way: ===== | + | ===== Second way : ===== |
− | |||
− | |||
− | <br> Go to [http://git.igep.es/?p=pub/scm/linux-omap-2.6.git;a=blob_plain;f=arch/arm/mach-omap2/board-igep00x0.c;hb=e620ef8e577d73681f16ab80471332286c1b9fd5 $(kernel path)/arch/arm/mach-omap2/board-igep00x0.c] and search next line: <br> | + | 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. <br> Go to [http://git.igep.es/?p=pub/scm/linux-omap-2.6.git;a=blob_plain;f=arch/arm/mach-omap2/board-igep00x0.c;hb=e620ef8e577d73681f16ab80471332286c1b9fd5 $(kernel path)/arch/arm/mach-omap2/board-igep00x0.c] and search next line: <br> |
<pre> if ((gpio_request(wifi_nreset, "WIFI NRESET") == 0) && | <pre> if ((gpio_request(wifi_nreset, "WIFI NRESET") == 0) && | ||
(gpio_direction_output(wifi_nreset, 1) == 0)) { | (gpio_direction_output(wifi_nreset, 1) == 0)) { | ||
Line 119: | Line 131: | ||
udelay(10); | udelay(10); | ||
gpio_set_value(wifi_nreset, 1); | gpio_set_value(wifi_nreset, 1); | ||
− | } </pre> | + | } else </pre> |
− | + | "igep00x0_wifi_bt_init" function initializes WIFI and Bluetooth peripherals, this code make a PWM to initialize WIFI. Edit lines to disable this initialization.<br> | |
− | <pre> if ((gpio_request(wifi_nreset, "WIFI NRESET") == 0) && | + | <pre> if ((gpio_request(wifi_nreset, "WIFI NRESET") == 0) && |
− | (gpio_direction_output(wifi_nreset, | + | (gpio_direction_output(wifi_nreset, 0) == 0)) { |
gpio_export(wifi_nreset, 0); | gpio_export(wifi_nreset, 0); | ||
− | |||
− | |||
− | |||
− | |||
− | |||
− | === TP65950 PCM VSP | + | } else </pre> |
+ | '''Compile kernel source code''' | ||
+ | |||
+ | Use this [[Linux Kernel 2.6.35.y|tutorial]] (Kernel) and this [http://labs.igep.es/index.php/The_IGEP_X-loader other] (IGEPxloader) to install Linaro Headless (or Poky) with your custom kernel in SD card. You can compile the IGEPxloader, but is not necessary.<br> | ||
+ | |||
+ | === TP65950 PCM VSP === | ||
+ | |||
+ | This module is used to transfer audio via Bluetooth | ||
+ | |||
+ | {| cellspacing="1" cellpadding="1" border="1" align="center" width="200" | ||
+ | |- | ||
+ | | [[Image:TPS-PCM-VSP.png|800x164px]] | ||
+ | |} | ||
+ | |||
+ | Click to enlarge image | ||
− | + | '''Disable BT audio'''<br> | |
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 [http://git.igep.es/?p=pub/scm/linux-omap-2.6.git;a=blob_plain;f=sound/soc/codecs/twl4030.c;hb=linux-2.6.35.y $(kernel path)/sound/soc/codecs/twl4030.c] file already read: <br> | 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 [http://git.igep.es/?p=pub/scm/linux-omap-2.6.git;a=blob_plain;f=sound/soc/codecs/twl4030.c;hb=linux-2.6.35.y $(kernel path)/sound/soc/codecs/twl4030.c] file already read: <br> | ||
<pre> 0x04, /* REG_VOICE_IF (0xF) */ | <pre> 0x04, /* REG_VOICE_IF (0xF) */ | ||
</pre> | </pre> | ||
− | + | '''Enable BT audio'''<br> | |
<pre> 0x00, /* REG_VOICE_IF (0xF) */ | <pre> 0x00, /* REG_VOICE_IF (0xF) */ | ||
+ | |||
</pre> | </pre> | ||
− | <br> | + | <br> |
+ | |||
+ | === TFP410 === | ||
+ | |||
+ | This external peripheral converts DVI signal to HDMI. To use some JA41/JA42 pads for other purpose is necessary disable it. GPIO_170 control TFP410 Power down (PD pad). | ||
+ | |||
+ | Power down (active low). In the powerdown state, only the digital I/O buffers and I2C interface remain active. A high level selects the normal operating mode. A low level selects the powerdown mode.<br> | ||
− | = | + | It was tested using alternate peripherals like UARTs and GPIOs. Caution, in powerdown mode, pads aren't in safe mode (high impedance). |
+ | |||
+ | {| cellspacing="1" cellpadding="1" border="1" align="center" width="200" | ||
+ | |- | ||
+ | | [[Image:Tfp410 IGEPv2.png|713x462px]] | ||
+ | |} | ||
+ | |||
+ | <br> | ||
+ | |||
+ | ===== 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 powerdown TFP410. | ||
+ | |||
+ | Logging with root user via SSH or Serial cable.<br> | ||
+ | |||
+ | NOTE: Poky distribution does not have debug filesystem enabled. Mount it: | ||
+ | <pre>mount -t debugfs none /sys/kernel/debug</pre> | ||
+ | Go to /sys/kernel/debug/omap_mux/<br> | ||
− | = | + | Set hdq_sio to gpio170 (mode 4): |
+ | <pre>echo 0x104 > hdp_sio</pre> | ||
+ | Revise that: | ||
+ | <pre>root@localhost:/sys/kernel/debug/omap_mux# cat hdq_sio | ||
+ | name: hdq_sio.gpio_170 (0x480021c6/0x196 = 0x0104), b j25, t NA | ||
+ | mode: OMAP_PIN_INPUT | OMAP_MUX_MODE4 | ||
+ | signals: hdq_sio | sys_altclk | i2c2_sccbe | i2c3_sccbe | gpio_170 | NA | NA | safe_mode | ||
+ | root@localhost:/sys/kernel/debug/omap_mux# | ||
+ | </pre> | ||
+ | Go to: /sys/class/gpio/ | ||
− | + | Check that gpio170 is in user space: | |
+ | <pre>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# | ||
+ | </pre> | ||
+ | If you don't have it, you should export gpio170: <br> | ||
+ | <pre>echo 170 > /sys/class/gpio/export </pre> | ||
+ | Set gpio170 to low value to disable TFP410: | ||
+ | <pre>echo 0 > /sys/class/gpio/gpio170/value</pre> | ||
+ | Revise that: | ||
+ | <pre>root@localhost:/sys/class/gpio# cat /sys/class/gpio/gpio170/value | ||
+ | 0 | ||
+ | root@localhost:/sys/class/gpio# | ||
+ | </pre> | ||
+ | ===== 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. <br> Go to [http://git.igep.es/?p=pub/scm/linux-omap-2.6.git;a=blob_plain;f=arch/arm/mach-omap2/board-igep0020.c;hb=db3cb47adf10504d3847d54927de50b2fa94c008 $(kernel path)/arch/arm/mach-omap2/board-igep0020.c] and search next line: <br> | |
− | + | <pre> static inline void igep0020_display_init(void) | |
− | + | static int igep0020_enable_dvi(struct omap_dss_device *dssdev) | |
− | + | { | |
+ | gpio_direction_output(GPIO_DVI_PUP, 1); | ||
− | + | return 0; | |
+ | } | ||
+ | </pre> | ||
+ | "static int igep0020_enable_dvi" initialize DVI. Edit to disable it: | ||
+ | <pre>static int igep0020_enable_dvi(struct omap_dss_device *dssdev) | ||
+ | { | ||
+ | gpio_direction_output(GPIO_DVI_PUP, 0); | ||
− | + | return 0; | |
+ | } | ||
+ | </pre> | ||
+ | '''Compile kernel source code''' | ||
− | + | Use this [[Linux Kernel 2.6.35.y|tutorial]] (Kernel) and this [http://labs.igep.es/index.php/The_IGEP_X-loader other] (IGEPxloader) to install Linaro Headless (or Poky) with your custom kernel in SD card. You can compile the IGEPxloader, but is not necessary.<br> | |
− | + | = Edit mux = | |
− | + | Here you can found some detailed examples to configure mux. You can add more. | |
− | + | === UART1 in J960 === | |
− | + | Use ebuddies to configure UART1 in J960, 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 [[Connectors Summary#J940_connector|here]] and [http://en.wikipedia.org/wiki/RS-485 here] | |
− | + | You can test new configuration using [[How to use UARTs|this tutorial]]<br> | |
− | + | === UART3 in J960 === | |
− | === | + | Edit igep.ini to disable serial debug, comment next lines: |
+ | <pre>; Setup the Kernel console params | ||
+ | ;console=ttyO2,115200n8 | ||
+ | ;console=ttyS2,115200n8 | ||
+ | ; Enable early printk | ||
+ | ;earlyprintk=serial,tty02,115200 | ||
+ | ;earlyprintk=serial,ttyS2,115200 </pre> | ||
− | + | Poky linux starts an user terminal at UART3, You must disable it to avoid interferences. Comment next lines in /etc/inittab: | |
− | + | <pre># Normally not reached, but fallthrough in case of emergency. | |
+ | #z6:6:respawn:/sbin/sulogin | ||
+ | #S:2345:respawn:/sbin/getty 115200 ttyO2 | ||
+ | # /sbin/getty invocations for the runlevels. | ||
+ | </pre> | ||
− | + | You can test new configuration using [[How to use UARTs|this tutorial]]<br> | |
− | === GPIO in | + | === GPIO in J990 === |
− | + | Reset [[Mux instructions#WIFI|WIFI]], [[Mux instructions#Bluetooth|BT]] or [[Mux instructions#TP65950_PCM_VSP|TPS]] if you use some pad shared with this connector, more information [[Connectors Summary#J990_connector|here]]. | |
+ | Configure GPIO, don't use [[Frequently Asked Questions and Their Answers#Is_it_possible_to_config_the_wireless_LAN_and_bluetooth_so_they_are_completely_off.2C_and_not_consuming_any_power_at_all.3F|these GPIO]] in IGEP WIFI/BT versions.<br> | ||
+ | Use [[How to use GPIOs|this manual]] to configure mux via user space<br> | ||
− | + | Edit [http://git.igep.es/?p=pub/scm/linux-omap-2.6.git;a=blob_plain;f=arch/arm/mach-omap2/board-igep00x0.c;hb=e620ef8e577d73681f16ab80471332286c1b9fd5 $(kernel path)/arch/arm/mach-omap2/board-igep00x0.c] or [http://git.igep.es/?p=pub/scm/linux-omap-2.6.git;a=blob_plain;f=arch/arm/mach-omap2/board-igep0020.c;hb=refs/heads/linux-2.6.35.y $(kernel path)/arch/arm/mach-omap2/board-igep0020.c] to configure GPIO via Kernel source, example [[How to set up UART2 in J990#Third_way|here]].<br> | |
− | [[Category: | + | [[Category:Peripherals]] |
Latest revision as of 19:30, 13 February 2013
Contents
Overview
This wiki page has more detailed information about mux on IGEPv2.
Read general 'Mux configuration' page before use it. This article contains:
- How-to disable some external peripherals to avoid interferences
- Some detailed examples.
Disable Peripherals
Some connectors share multiple peripherals like OMAP, WIFI/BT combo, etc. You should disable unused peripherals to avoid interferences. For example: if you want to control WIFI module via J990 disable OMAP or if you want use UART2 at j990 disable Bluetooth. See schematics or connectors summary for more information.
BT/WIFI Combo
Bluetooth and WIFI can be disabled separately with reset pins: RESET_N_W (for WIFI) in pad 47 and RST_N_B (for Bluetooth) in pad 16:
- RESET_N_W/RST_N_B=0: Enabled reset
- RESET_N_W/RST_N_B=1: Disabled reset
Use GPIO to control it. See FAQs to know which GPIO needs to be used.
Click to enlarge image
Bluetooth
There are two ways to disable Bluetooth. More information about 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.
NOTE: Poky distribution does not have debug filesystem enabled. Mount it:
mount -t debugfs none /sys/kernel/debug
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 (or Poky) with your custom kernel in SD card. You can compile the IGEPxloader, but is not necessary.
WIFI
There are two ways to disable WIFI. More information about 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. If you need bluetooth activate, configure it before disable WIFI. Follow this tutorial.
Logging with root user via SSH or Serial cable.
NOTE: Poky distribution does not have debug filesystem enabled. Mount it:
mount -t debugfs none /sys/kernel/debug
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 (or Poky) with your custom kernel in SD card. You can compile the IGEPxloader, but is not necessary.
TP65950 PCM VSP
This module is used to transfer audio via Bluetooth
Click to enlarge image
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) */
TFP410
This external peripheral converts DVI signal to HDMI. To use some JA41/JA42 pads for other purpose is necessary disable it. GPIO_170 control TFP410 Power down (PD pad).
Power down (active low). In the powerdown state, only the digital I/O buffers and I2C interface remain active. A high level selects the normal operating mode. A low level selects the powerdown mode.
It was tested using alternate peripherals like UARTs and GPIOs. Caution, in powerdown mode, pads aren't in safe mode (high impedance).
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 powerdown TFP410.
Logging with root user via SSH or Serial cable.
NOTE: Poky distribution does not have debug filesystem enabled. Mount it:
mount -t debugfs none /sys/kernel/debug
Go to /sys/kernel/debug/omap_mux/
Set hdq_sio to gpio170 (mode 4):
echo 0x104 > hdp_sio
Revise that:
root@localhost:/sys/kernel/debug/omap_mux# cat hdq_sio name: hdq_sio.gpio_170 (0x480021c6/0x196 = 0x0104), b j25, t NA mode: OMAP_PIN_INPUT | OMAP_MUX_MODE4 signals: hdq_sio | sys_altclk | i2c2_sccbe | i2c3_sccbe | gpio_170 | NA | NA | safe_mode root@localhost:/sys/kernel/debug/omap_mux#
Go to: /sys/class/gpio/
Check that gpio170 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 gpio170:
echo 170 > /sys/class/gpio/export
Set gpio170 to low value to disable TFP410:
echo 0 > /sys/class/gpio/gpio170/value
Revise that:
root@localhost:/sys/class/gpio# cat /sys/class/gpio/gpio170/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:
static inline void igep0020_display_init(void) static int igep0020_enable_dvi(struct omap_dss_device *dssdev) { gpio_direction_output(GPIO_DVI_PUP, 1); return 0; }
"static int igep0020_enable_dvi" initialize DVI. Edit to disable it:
static int igep0020_enable_dvi(struct omap_dss_device *dssdev) { gpio_direction_output(GPIO_DVI_PUP, 0); return 0; }
Compile kernel source code
Use this tutorial (Kernel) and this other (IGEPxloader) to install Linaro Headless (or Poky) with your custom kernel in SD card. You can compile the IGEPxloader, but is not necessary.
Edit mux
Here you can found some detailed examples to configure mux. You can add more.
UART1 in J960
Use ebuddies to configure UART1 in J960, 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
UART3 in J960
Edit igep.ini to disable serial debug, comment next lines:
; Setup the Kernel console params ;console=ttyO2,115200n8 ;console=ttyS2,115200n8 ; Enable early printk ;earlyprintk=serial,tty02,115200 ;earlyprintk=serial,ttyS2,115200
Poky linux starts an user terminal at UART3, You must disable it to avoid interferences. Comment next lines in /etc/inittab:
# Normally not reached, but fallthrough in case of emergency. #z6:6:respawn:/sbin/sulogin #S:2345:respawn:/sbin/getty 115200 ttyO2 # /sbin/getty invocations for the runlevels.
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.