COM iMX6 Linux - Revision history

Pzimmermann: Added Subpage for calibration of resistive touchscreens

2023-10-20T06:45:49Z

Added Subpage for calibration of resistive touchscreens

← Older revision		Revision as of 08:45, 20 October 2023
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	:[[Image:DHCM_Device_Tree_pattern.jpg\|1200px\|DHCOM Device Tree pattern]]		:[[Image:DHCM_Device_Tree_pattern.jpg\|1200px\|DHCOM Device Tree pattern]]

	==~~Debian~~ Rootfilesystem ==		== Rootfilesystem ==

	=== Available Rootfilesystems ===		=== Available Rootfilesystems ===
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	\|}		\|}
	:Check the enviroment variable "TSLIB_TSDEVICE=/dev/input/event0" with <tt> printenv </tt> if an error occurs.		:Check the enviroment variable "TSLIB_TSDEVICE=/dev/input/event0" with <tt> printenv </tt> if an error occurs.

			=== How to calibrate resistive touchscreens (only on Yocto images) ===
			{{:Calibration of resistive touchscreens}}

	== Kernel Userspace Interfaces to Access Hardware ==		== Kernel Userspace Interfaces to Access Hardware ==

Capfel: /* SPI Interfaces */

2023-01-13T14:14:29Z

SPI Interfaces

← Older revision		Revision as of 16:14, 13 January 2023
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	=== SPI Interfaces ===		=== SPI Interfaces ===
	:{\| class="wikitable" style="width: 400px"		:{\| class="wikitable" style="width: 400px"
	\|\|<b>Device</b>\|\|<b>Kernel <= 4.4.60</b>\|\|<b>Kernel >= 5.10.xxx</b>		\|\|<b>Device</b>\|\|<b>Kernel <= 5.4.xxx</b>\|\|<b>Kernel >= 5.10.xxx</b>
	\|-		\|-
	\|\|DHCOM SPI 1\|\|<tt>/dev/spidev0.2</tt>\|\|<tt>/dev/spidev0.1</tt>		\|\|DHCOM SPI 1\|\|<tt>/dev/spidev0.2</tt>\|\|<tt>/dev/spidev0.1</tt>

Capfel: /* SPI Interfaces */

2023-01-13T13:51:58Z

SPI Interfaces

← Older revision		Revision as of 15:51, 13 January 2023
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	=== SPI Interfaces ===		=== SPI Interfaces ===
	:{\| class="wikitable" style="width: 400px"		:{\| class="wikitable" style="width: 400px"
	\|\|~~DHCOM SPI 1~~\|\|<tt>/~~dev/spidev0~~.2</tt>		\|\|<b>Device</b>\|\|<b>Kernel <= 4.4.60</b>\|\|<b>Kernel >= 5.10.xxx</b>
	\|-		\|-
	\|\|DHCOM SPI 2 \|\|<tt>/dev/spidev1.0</tt>		\|\|DHCOM SPI 1\|\|<tt>/dev/spidev0.2</tt>\|\|<tt>/dev/spidev0.1</tt>
			\|-
			\|\|DHCOM SPI 2 \|\|<tt>/dev/spidev1.0</tt>\|\|<tt>/dev/spidev1.0</tt>
	\|}		\|}

Christoph: /* Make your own Device Tree for your board */

2021-09-21T09:57:23Z

Make your own Device Tree for your board

← Older revision		Revision as of 11:57, 21 September 2021
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	:3. Add your new main Device Tree file to <code>Makefile</code> (located in the same folder)		:3. Add your new main Device Tree file to <code>Makefile</code> (located in the same folder)
	<br/>		<br/>
	:'''DH Device Tree pattern''':		:'''DH Device Tree pattern (Kernel 4.4.x)''':
	:[[Image:DHCM_Device_Tree_pattern.jpg\|1200px\|DHCOM Device Tree pattern]]		:[[Image:DHCM_Device_Tree_pattern.jpg\|1200px\|DHCOM Device Tree pattern]]

Christoph: /* Control GPIOs */

2021-09-21T09:52:52Z

Control GPIOs

Christoph: /* Kernel Userspace Interfaces to Access Hardware */

2020-09-30T09:47:33Z

Kernel Userspace Interfaces to Access Hardware

← Older revision		Revision as of 11:47, 30 September 2020
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	== Kernel Userspace Interfaces to Access Hardware ==		== Kernel Userspace Interfaces to Access Hardware ==

			=== Ethernet Interfaces ===
			:{\| class="wikitable" style="width: 400px"
			\|\|DHCOM ENET 1\|\|<tt>ethsom0</tt>
			\|-
			\|\|DHCOM ENET 2\|\|<tt>ethsom1</tt>
			\|}

	=== Serial (UART) Interfaces ===		=== Serial (UART) Interfaces ===

Christoph at 07:13, 11 May 2020

2020-05-11T07:13:06Z

← Older revision		Revision as of 09:13, 11 May 2020
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	=== Available Rootfilesystems ===		=== Available Rootfilesystems ===
	:Please have a look at the [[~~COM_iMX6~~-D2#Download binaries/images \| iMX6 Images]] section.		:Please have a look at the [[DHCOM_iMX6-D2#Download binaries/images \| iMX6 Images]] section.

	=== Login ===		=== Login ===

Christoph at 07:09, 11 May 2020

2020-05-11T07:09:26Z

← Older revision		Revision as of 09:09, 11 May 2020
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	== Linux Kernel ==		== Linux Kernel ==
	=== Sources: Look at page [[~~COM~~ iMX6-D2#BSP Sources\|i.MX6 BSP Sources]] ===		=== Sources: Look at page [[DHCOM iMX6-D2#BSP Sources\|i.MX6 BSP Sources]] ===

	=== How to build a Kernel ===		=== How to build a Kernel ===
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	:[[Image:DHCM_Display_Settings.jpg\|1300px\|DHCOM Display Settings]]		:[[Image:DHCM_Display_Settings.jpg\|1300px\|DHCOM Display Settings]]
	<br/>		<br/>
	For detailed description of the '''display boot args''' please have a look at [[~~COM~~ iMX6 Bootloader U-Boot#Display and Hardware settings\|Display and Hardware settings]] of the iMX6 Bootloader.		For detailed description of the '''display boot args''' please have a look at [[DHCOM iMX6 Bootloader U-Boot#Display and Hardware settings\|Display and Hardware settings]] of the iMX6 Bootloader.

	== Additional Information ==		== Additional Information ==
	:*[[Linux Kernel Features \| Linux Kernel Features ]]		:*[[Linux Kernel Features \| Linux Kernel Features ]]
	:*[[ELBE Overview\| Embedded Linux Build Environment (ELBE)]]		:*[[ELBE Overview\| Embedded Linux Build Environment (ELBE)]]

Christoph: /* Control GPIOs */

2020-03-27T08:12:55Z

Control GPIOs

← Older revision		Revision as of 10:12, 27 March 2020
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	:: '''Remark:''' Depending on your board configuration some of the additional gpios shared with the camera interface are not available on your system.		:: '''Remark:''' Depending on your board configuration some of the additional gpios shared with the camera interface are not available on your system.


			:'''GPIO pin configuration'''
			:: The default Linux Device Tree pin configurarion of the DHCOM GPIOs A - W is <code>0x400120b0</code>
			::{\| class="wikitable"
			\|
			Pad Mux Register (0x020E_xxxx) = 0x0000_0015
			SION: 1 Enabled (Force input path of pad)
			MUX_MODE: 0101 ALT5

			Pad Control Register (0x020E_xxxx) = 0x0001_20B0
			HYS: 1 Hysteresis enabled (Schmitt trigger input)
			==============
			PUS: 00 100k Pull Down
			PUE: 1 PULL (Pull enabled)
			PKE: 0 Disable (Pull/Keeper disabled)
			ODE: 0 Disable (Output is CMOS)
			RESERVED: 000
			--------------
			SPEED: 10 imx6: 100MHz (medium)
			imx6ull: 100MHz (medium)
			DSE: 110 Drive strength imx6: 40 Ohm
			imx6ull: 43 Ohm @ 3.3V
			RESERVED 00
			SRE: 0 SLOW (Slow Slew Rate)
			\|}

	:'''Controlled by sysfs (since Kernel v4.8 deprecated)'''		:'''Controlled by sysfs (since Kernel v4.8 deprecated)'''

Christoph: /* Parallel Address- / Databus */

2020-03-17T15:56:42Z

Parallel Address- / Databus

← Older revision		Revision as of 17:56, 17 March 2020
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	=== Parallel Address- / Databus ===		=== Parallel Address- / Databus ===

	:To use the 16-bit address / databus from Linux userspace you can use the UIO driver interface. To enable and configure the interface it is necessary to setup the ~~i.MX6~~ WEIM controller with the device tree. See the documentation of the device tree bindings of weim [https://github.com/dh-electronics/linux-imx6qdl/blob/dev/4.4.60_dhcom/Documentation/devicetree/bindings/bus/imx-weim.txt here].		:To use the 16-bit address / databus from Linux userspace you can use the UIO driver interface. To enable and configure the interface it is necessary to setup the WEIM controller with the device tree. See the documentation of the device tree bindings of weim [https://github.com/dh-electronics/linux-imx6qdl/blob/dev/4.4.60_dhcom/Documentation/devicetree/bindings/bus/imx-weim.txt here].

	:Here is an example code which demonstrates how to do enable and configure the WEIM interface (parallel address- / databus):		:Here is an example code which demonstrates how to do enable and configure the WEIM interface (parallel address- / databus):

← Older revision		Revision as of 11:52, 21 September 2021
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	:See which gpio is already used by the system		:See which gpio is already used by the system
	:{\| class="wikitable"		:{\| class="wikitable"
	\|<tt>''cat /sys/kernel/debug/gpio''</tt>		\|<tt>''cat /sys/kernel/debug/gpio \| grep -v "gpio-... ( "''</tt> <br>or<br> <tt>''gpioinfo \| grep -v unnamed''</tt>
	\|}		\|}

	:{\|class="wikitable" style="text-align: center; width: ~~700px~~"		:{\|class="wikitable" style="text-align: center; width: 1000px"
	\|-		\|-
	! DHCOM Name: !! alt. DHCOM Name: !! SO-DIMM Pin# !! CPU Pad Name !! Linux <GPIO#> *		! DHCOM Name: !! alt. DHCOM Name: !! SO-DIMM Pin# !! CPU Pad Name !! Linux <GPIO#> * !! gpiod label (deprecated): !! gpiod label:
	\|-		\|-
	\| GPIO A \|\| \|\| 154 \|\| PAD_GPIO_2 \|\| 2		\| GPIO A \|\| \|\| 154 \|\| PAD_GPIO_2 \|\| 2 \|\| A \|\| DHCOM-A
	\|-		\|-
	\| GPIO B \|\| \|\| 156 \|\| PAD_GPIO_4 \|\| 4		\| GPIO B \|\| \|\| 156 \|\| PAD_GPIO_4 \|\| 4 \|\| B \|\| DHCOM-B
	\|-		\|-
	\| GPIO C \|\| \|\| 162 \|\| PAD_GPIO_5 \|\| 5		\| GPIO C \|\| \|\| 162 \|\| PAD_GPIO_5 \|\| 5 \|\| C \|\| DHCOM-C
	\|-		\|-
	\| GPIO D \|\| \|\| 163 \|\| PAD_CSI0_DAT17 \|\| 163		\| GPIO D \|\| \|\| 163 \|\| PAD_CSI0_DAT17 \|\| 163 \|\| D \|\| DHCOM-D
	\|-		\|-
	\| GPIO E \|\| \|\| 164 \|\| PAD_GPIO_19 \|\| 101		\| GPIO E \|\| \|\| 164 \|\| PAD_GPIO_19 \|\| 101 \|\| E \|\| DHCOM-E
	\|-		\|-
	\| GPIO F \|\| \|\| 165 \|\| PAD_DI0_PIN4 \|\| 116		\| GPIO F \|\| \|\| 165 \|\| PAD_DI0_PIN4 \|\| 116 \|\| F \|\| DHCOM-F
	\|-		\|-
	\| GPIO G \|\| \|\| 167 \|\| PAD_EIM_D27 \|\| 91		\| GPIO G \|\| \|\| 167 \|\| PAD_EIM_D27 \|\| 91 \|\| G \|\| DHCOM-G
	\|-		\|-
	\| GPIO H \|\| \|\| 173 \|\| PAD_KEY_ROW0 \|\| 103		\| GPIO H \|\| \|\| 173 \|\| PAD_KEY_ROW0 \|\| 103 \|\| H \|\| DHCOM-H
	\|-		\|-
	\| GPIO I \|\| \|\| 175 \|\| PAD_KEY_COL1 \|\| 104		\| GPIO I \|\| \|\| 175 \|\| PAD_KEY_COL1 \|\| 104 \|\| I \|\| DHCOM-I
	\|-		\|-
	\| GPIO J \|\| CIF HSYNC \|\| 74 \|\| PAD_NANDF_CS1 \|\| 174		\| GPIO J \|\| CIF HSYNC \|\| 74 \|\| PAD_NANDF_CS1 \|\| 174 \|\| J \|\| DHCOM-J
	\|-		\|-
	\| GPIO K \|\| CIF PCLK \|\| 72 \|\| PAD_NANDF_CS2 \|\| 175		\| GPIO K \|\| CIF PCLK \|\| 72 \|\| PAD_NANDF_CS2 \|\| 175 \|\| K \|\| DHCOM-K
	\|-		\|-
	\| GPIO L \|\| CIF MCLK \|\| 70 \|\| PAD_KEY_ROW1 \|\| 105		\| GPIO L \|\| CIF MCLK \|\| 70 \|\| PAD_KEY_ROW1 \|\| 105 \|\| L \|\| DHCOM-L
	\|-		\|-
	\| GPIO M \|\| CIF VSYNC \|\| 68 \|\| PAD_SD3_DAT5 \|\| 192		\| GPIO M \|\| CIF VSYNC \|\| 68 \|\| PAD_SD3_DAT5 \|\| 192 \|\| M \|\| DHCOM-M
	\|-		\|-
	\| GPIO N \|\| CIF D9 \|\| 66 \|\| PAD_SD3_DAT4 \|\| 193		\| GPIO N \|\| CIF D9 \|\| 66 \|\| PAD_SD3_DAT4 \|\| 193 \|\| N \|\| DHCOM-N
	\|-		\|-
	\| GPIO O \|\| CIF D8 \|\| 64 \|\| PAD_CSI0_VSYNC \|\| 149		\| GPIO O \|\| CIF D8 \|\| 64 \|\| PAD_CSI0_VSYNC \|\| 149 \|\| O \|\| DHCOM-O
	\|-		\|-
	\| GPIO P \|\| CIF D7 \|\| 62 \|\| PAD_GPIO_18 \|\| 205		\| GPIO P \|\| CIF D7 \|\| 62 \|\| PAD_GPIO_18 \|\| 205 \|\| P \|\| DHCOM-P
	\|-		\|-
	\| GPIO Q \|\| CIF D6 \|\| 60 \|\| PAD_SD1_CMD \|\| 18		\| GPIO Q \|\| CIF D6 \|\| 60 \|\| PAD_SD1_CMD \|\| 18 \|\| Q \|\| DHCOM-Q
	\|-		\|-
	\| GPIO R \|\| CIF D5 \|\| 58 \|\| PAD_SD1_DAT0 \|\| 16		\| GPIO R \|\| CIF D5 \|\| 58 \|\| PAD_SD1_DAT0 \|\| 16 \|\| R \|\| DHCOM-R
	\|-		\|-
	\| GPIO S \|\| CIF D4 \|\| 56 \|\| PAD_SD1_DAT1 \|\| 17		\| GPIO S \|\| CIF D4 \|\| 56 \|\| PAD_SD1_DAT1 \|\| 17 \|\| S \|\| DHCOM-S
	\|-		\|-
	\| GPIO T \|\| CIF D3 \|\| 54 \|\| PAD_SD1_DAT2 \|\| 19		\| GPIO T \|\| CIF D3 \|\| 54 \|\| PAD_SD1_DAT2 \|\| 19 \|\| T \|\| DHCOM-T
	\|-		\|-
	\| GPIO U \|\| CIF D2 \|\| 52 \|\| PAD_SD1_CLK \|\| 20		\| GPIO U \|\| CIF D2 \|\| 52 \|\| PAD_SD1_CLK \|\| 20 \|\| U \|\| DHCOM-U
	\|-		\|-
	\| GPIO V \|\| CIF D1 \|\| 50 \|\| PAD_CSI0_PIXCLK \|\| 146		\| GPIO V \|\| CIF D1 \|\| 50 \|\| PAD_CSI0_PIXCLK \|\| 146 \|\| V \|\| DHCOM-V
	\|-		\|-
	\| GPIO W \|\| CIF D0 \|\| 48 \|\| PAD_CSI0_MCLK \|\| 147		\| GPIO W \|\| CIF D0 \|\| 48 \|\| PAD_CSI0_MCLK \|\| 147 \|\| W \|\| DHCOM-W
	\|-		\|-
	\| INT HIGHEST PRIORITY \|\| \|\| 151 \|\| PAD_KEY_COL0\|\| 102		\| INT HIGHEST PRIORITY \|\| \|\| 151 \|\| PAD_KEY_COL0\|\| 102 \|\| INT \|\| DHCOM-INT
	\|}		\|}
	:: * = Valid if you didn't change the CONFIG_ARCH_NR_GPIO value in kernel config '''AND''' if your kernel doesn't probe another GPIO controller before the imx6 GPIO controller		:: * = Valid if you didn't change the CONFIG_ARCH_NR_GPIO value in kernel config '''AND''' if your kernel doesn't probe another GPIO controller before the imx6 GPIO controller
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	SRE: 0 SLOW (Slow Slew Rate)		SRE: 0 SLOW (Slow Slew Rate)
	\|}		\|}

			:'''Controlled by gpiod tools (need Kernel v4.7 or higher)'''
			::Set state
			::{\| class="wikitable"
			\|<tt>''gpioset $(gpiofind GPIO_LABEL)=0''</tt>
			\|-
			\|<tt>''gpioset $(gpiofind GPIO_LABEL)=1''</tt>
			\|}

			::Get state
			::{\| class="wikitable"
			\|<tt>''gpioget $(gpiofind GPIO_LABEL)''</tt>
			\|-
			\|<tt>''gpioget $(gpiofind GPIO_LABEL)''</tt>
			\|}
			:: '''Remark:''' GPIO_LABEL could be DHCOM-A, DHCOM-B, DHCOM-C, ... see table above

	:'''Controlled by sysfs (since Kernel v4.8 deprecated)'''		:'''Controlled by sysfs (since Kernel v4.8 deprecated)'''