FAQ General - Revision history

Pzimmermann: /* Root Filesystem */ Added section for autologin

2021-04-27T12:16:34Z

Root Filesystem: Added section for autologin

@@ Line 69: / Line 69: @@
 |}
 For further information have a look at the general linux documentation.
 === NAND ===

Lzenz: /* Thermal Management: Reasonable Values For Thermal Thresholds */

2016-05-24T07:41:00Z

Thermal Management: Reasonable Values For Thermal Thresholds

← Older revision		Revision as of 09:41, 24 May 2016
Line 180:		Line 180:
	* The '''critical trip point''' should not be exceeded to avoid damaging the SoC and as such when this threshold is reached the operating systems shutdown function is called to attempt to shut down the OS.		* The '''critical trip point''' should not be exceeded to avoid damaging the SoC and as such when this threshold is reached the operating systems shutdown function is called to attempt to shut down the OS.

	An (carefull) example for industrial grade i.MX6 SoC (-40 to 105C):		A (carefull) example for industrial grade i.MX6 SoC (-40 to 105C):
	* critical Trip Point = maxT – 5C = 100C		* critical Trip Point = maxT – 5C = 100C
	* passive Trip Point = maxT – 20C = 85C		* passive Trip Point = maxT – 20C = 85C

Lzenz: /* Clone/copy a SD/µSD card */

2016-05-24T07:34:06Z

Clone/copy a SD/µSD card

← Older revision		Revision as of 09:34, 24 May 2016
Line 229:		Line 229:
	'''Remark:''' Before you can do this you have to clone the DH repository from GitHub (look at the Linux section of your module type)		'''Remark:''' Before you can do this you have to clone the DH repository from GitHub (look at the Linux section of your module type)

	=== Clone/~~copy~~ a SD/µSD card ===		=== Write/Clone/Copy a SD/µSD card Images ===
			==== ''How to write a *.sdcard binary image to a sdcard?'' ====
			The easiest way is to use <tt>'''dd'''</tt> on your Linux development PC.
			* Insert your µSD Card in your Card-Reader and connect it to your PC.
			* Find out the /dev/DEVNAME device name for example with <tt>'''dmesg'''</tt> in the terminal.
			* '''Important:''' Be sure to write in the following step to the correct device.
			* Flash your Image.sdcard with:
			{\| class="wikitable" \| style="width: 100%; color: #000000; background: #FFFFFF;" valign="top" \|
			\|<tt>dd if=/path/to/Image.sdcard of=/dev/DEVNAME bs=1M</tt>
			\|}
			* You can use <tt>'''dd'''</tt> to create a backup of a µSD card when you swap the <tt>'''if='''</tt> and <tt>'''of='''</tt> args.

	==== ''Cloning the complete card (bit by bit)'' ====		==== ''Cloning the complete card (bit by bit)'' ====
	{\| class="wikitable" \| style="width: 100%; color: #000000; background: #FFFFFF;" valign="top" \|		{\| class="wikitable" \| style="width: 100%; color: #000000; background: #FFFFFF;" valign="top" \|

Lzenz: /* Kernel version */

2016-05-24T07:33:23Z

Kernel version

@@ Line 228: / Line 228: @@
 |}
 '''Remark:''' Before you can do this you have to clone the DH repository from GitHub (look at the Linux section of your module type)
 === Clone/copy a SD/µSD card ===

Lzenz: /* Kernel version */

2016-05-24T07:32:38Z

Kernel version

← Older revision		Revision as of 09:32, 24 May 2016
Line 208:		Line 208:

	=== Kernel version ===		=== Kernel version ===
	==== Get Kernel version (on target) ====		==== ''Get Kernel version (on target)'' ====
	{\| class="wikitable" \| style="width: 100%; color: #000000; background: #FFFFFF;" valign="top" \|		{\| class="wikitable" \| style="width: 100%; color: #000000; background: #FFFFFF;" valign="top" \|
	\|		\|
Line 217:		Line 217:
	short git SHA = a81067a (this is an identifier for each git commit)		short git SHA = a81067a (this is an identifier for each git commit)

	==== ~~Finding~~ git commit of a specific version (on a develop machine) ====		==== ''git commit of a specific version (on a develop machine)'' ====
	{\| class="wikitable" \| style="width: 100%; color: #000000; background: #FFFFFF;" valign="top" \|		{\| class="wikitable" \| style="width: 100%; color: #000000; background: #FFFFFF;" valign="top" \|
	\|		\|

Lzenz: /* Clone/copy a SD/µSD card */

2016-05-24T07:32:08Z

Clone/copy a SD/µSD card

← Older revision		Revision as of 09:32, 24 May 2016
Line 228:		Line 228:
	\|}		\|}
	'''Remark:''' Before you can do this you have to clone the DH repository from GitHub (look at the Linux section of your module type)		'''Remark:''' Before you can do this you have to clone the DH repository from GitHub (look at the Linux section of your module type)

			==== ''How to write a *.sdcard binary image to a sdcard?'' ====
			The easiest way is to use <tt>'''dd'''</tt> on your Linux development PC.
			* Insert your µSD Card in your Card-Reader and connect it to your PC.
			* Find out the /dev/DEVNAME device name for example with <tt>'''dmesg'''</tt> in the terminal.
			* '''Important:''' Be sure to write in the following step to the correct device.
			* Flash your Image.sdcard with:
			{\| class="wikitable" \| style="width: 100%; color: #000000; background: #FFFFFF;" valign="top" \|
			\|<tt>dd if=/path/to/Image.sdcard of=/dev/DEVNAME bs=1M</tt>
			\|}
			* You can use <tt>'''dd'''</tt> to create a backup of a µSD card when you swap the <tt>'''if='''</tt> and <tt>'''of='''</tt> args.

	=== Clone/copy a SD/µSD card ===		=== Clone/copy a SD/µSD card ===
	==== Cloning the complete card (bit by bit) ====		==== ''Cloning the complete card (bit by bit)'' ====
	{\| class="wikitable" \| style="width: 100%; color: #000000; background: #FFFFFF;" valign="top" \|		{\| class="wikitable" \| style="width: 100%; color: #000000; background: #FFFFFF;" valign="top" \|
	\|		\|
Line 242:		Line 253:
	'''Remark:''' Only possible if the card size are identical or the target card is greater!		'''Remark:''' Only possible if the card size are identical or the target card is greater!

	==== Copy the sd card content via a copmpressed archive file ====		==== ''Copy the sd card content via a copmpressed archive file'' ====
	{\| class="wikitable" \| style="width: 100%; color: #000000; background: #FFFFFF;" valign="top" \|		{\| class="wikitable" \| style="width: 100%; color: #000000; background: #FFFFFF;" valign="top" \|
	\|		\|

Lzenz: /* General */

2016-05-24T07:21:37Z

General

@@ Line 4: / Line 4: @@
 ==== ''Do the DHCOM modules have a serial numbers included? If yes, how is it accessible?'' ====
 The serial number of a DHCOM module is stored inside the bootloader environment. It can be retrieved by u-boot commands like printenv or by Linux commands like “fw_printenv”
 == Bootloader ==

Lzenz: /* General */

2016-05-24T07:20:08Z

General

@@ Line 4: / Line 4: @@
 ==== ''Do the DHCOM modules have a serial numbers included? If yes, how is it accessible?'' ====
 The serial number of a DHCOM module is stored inside the bootloader environment. It can be retrieved by u-boot commands like printenv or by Linux commands like “fw_printenv”
 == Bootloader ==

Ageisreiter: /* fb_videomode struct description */

2016-05-03T08:35:55Z

fb_videomode struct description

← Older revision		Revision as of 10:35, 3 May 2016
Line 286:		Line 286:
	<tt>FB_SYNC_VERT_HIGH_ACT </tt> --> VSYNC pulse is active high<br/>		<tt>FB_SYNC_VERT_HIGH_ACT </tt> --> VSYNC pulse is active high<br/>
	<tt>FB_SYNC_CLK_LAT_FALL </tt> --> Display must sample data on falling edge<br/>		<tt>FB_SYNC_CLK_LAT_FALL </tt> --> Display must sample data on falling edge<br/>
	<tt>FB_SYNC_OE_LOW_ACT </tt> --> OE active low<br/>		<tt>FB_SYNC_OE_LOW_ACT </tt> --> OE pulse is active low<br/>
	<tt>FB_SYNC_DATA_INVERT </tt> --> Data inverted<br/>		<tt>FB_SYNC_DATA_INVERT </tt> --> Data inverted<br/>
	\|}		\|}

Ageisreiter: /* fb_videomode struct description */

2016-05-03T08:35:14Z

fb_videomode struct description

← Older revision		Revision as of 10:35, 3 May 2016
Line 262:		Line 262:

	=== fb_videomode struct description ===		=== fb_videomode struct description ===
			To integrate support for an additional display it is necessary to expand the fb_videomode struct in linux.
	struct fb_videomode {		struct fb_videomode {
	const char name; / optional */		const char name; / optional */