U-Boot Overview - Revision history

Mdean: Added Where To Go Next

2015-11-18T22:30:45Z

Added Where To Go Next

Bserrano at 19:44, 11 April 2014

2014-04-11T19:44:35Z

Bserrano at 21:24, 6 March 2014

2014-03-06T21:24:25Z

Mgloff: Comment category tag

2014-01-02T21:56:44Z

Comment category tag

Kyoungmeyer: fix old link

2013-12-31T23:36:15Z

fix old link

Kyoungmeyer at 17:52, 31 December 2013

2013-12-31T17:52:54Z

Mgloff at 17:32, 31 December 2013

2013-12-31T17:32:47Z

Mgloff at 17:29, 31 December 2013

2013-12-31T17:29:23Z

Mwelling at 17:08, 31 December 2013

2013-12-31T17:08:01Z

Mwelling: /* Important Variables */

2013-12-20T19:20:49Z

‎Important Variables

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-{{todo|SEOKWREV;(12-31-13-11:30->MG+);(12.31.13:11:52->KY+);(03.06.14-15:25->BS-);(04.11.14-14:45->BS+)|Michael Welling|project=oe 4,oe 5,mw,mg,SEOKWREV,ky,bs}}
+{{todo|Complete;(12-31-13-11:30->MG+);(12.31.13:11:52->KY+);(03.06.14-15:25->BS-);(04.11.14-14:45->BS+)(11.18.2015-16:30->MD+)|Michael Welling|project=oe 4,oe 5,mw,mg,Complete,ky,bs}}
 {{#seo:|title=U-Boot Overview|titlemode=append|keywords=U-Boot Bootloader,U-Boot Environment,bootargs,bootcmd,Boot Variables|description=This page provides an introduction to U-Boot and common commands.}}
@@ Line 155: / Line 155: @@
 ==== bootcmd ====
 The <code>bootcmd</code> variable is a set of instructions used to relocate and boot the Linux kernel. This command will vary from machine to machine based on Flash and RAM types.
 <!--[[Category:Bootloaders]]-->

← Older revision		Revision as of 19:44, 11 April 2014
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−	{{todo\|~~SEOKWTODO~~;(12-31-13-11:30->MG+);(12.31.13:11:52->KY+);(03.06.14-15:25->BS-)\|Michael Welling\|project=oe 4,oe 5,mw,mg,~~SEOKWTODO~~,ky,bs}}	+	{{todo\|SEOKWREV;(12-31-13-11:30->MG+);(12.31.13:11:52->KY+);(03.06.14-15:25->BS-);(04.11.14-14:45->BS+)\|Michael Welling\|project=oe 4,oe 5,mw,mg,SEOKWREV,ky,bs}}

		+	{{#seo:\|title=U-Boot Overview\|titlemode=append\|keywords=U-Boot Bootloader,U-Boot Environment,bootargs,bootcmd,Boot Variables\|description=This page provides an introduction to U-Boot and common commands.}}
	Das U-Boot is the bootloader used on the majority of EMAC's ARM-based systems. It is loaded by the processor boot-ROM or low-level bootstrap code and performs device initialization followed by loading and starting the OS. EMAC has made modifications to U-Boot to add additional features when necessary. While generally used to load Linux, EMAC also uses U-Boot to load Windows CE and other operating systems. This page provides an introduction to U-Boot and common commands. Complete U-Boot documentation can be found at http://www.denx.de/wiki/U-Boot/WebHome		Das U-Boot is the bootloader used on the majority of EMAC's ARM-based systems. It is loaded by the processor boot-ROM or low-level bootstrap code and performs device initialization followed by loading and starting the OS. EMAC has made modifications to U-Boot to add additional features when necessary. While generally used to load Linux, EMAC also uses U-Boot to load Windows CE and other operating systems. This page provides an introduction to U-Boot and common commands. Complete U-Boot documentation can be found at http://www.denx.de/wiki/U-Boot/WebHome

← Older revision		Revision as of 21:24, 6 March 2014
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−	{{todo\|~~Complete~~;(12-31-13-11:30->MG+);(12.31.13:11:52->KY+)\|Michael Welling\|project=oe 4,oe 5,mw,mg,~~Complete~~,ky}}	+	{{todo\|SEOKWTODO;(12-31-13-11:30->MG+);(12.31.13:11:52->KY+);(03.06.14-15:25->BS-)\|Michael Welling\|project=oe 4,oe 5,mw,mg,SEOKWTODO,ky,bs}}

	Das U-Boot is the bootloader used on the majority of EMAC's ARM-based systems. It is loaded by the processor boot-ROM or low-level bootstrap code and performs device initialization followed by loading and starting the OS. EMAC has made modifications to U-Boot to add additional features when necessary. While generally used to load Linux, EMAC also uses U-Boot to load Windows CE and other operating systems. This page provides an introduction to U-Boot and common commands. Complete U-Boot documentation can be found at http://www.denx.de/wiki/U-Boot/WebHome		Das U-Boot is the bootloader used on the majority of EMAC's ARM-based systems. It is loaded by the processor boot-ROM or low-level bootstrap code and performs device initialization followed by loading and starting the OS. EMAC has made modifications to U-Boot to add additional features when necessary. While generally used to load Linux, EMAC also uses U-Boot to load Windows CE and other operating systems. This page provides an introduction to U-Boot and common commands. Complete U-Boot documentation can be found at http://www.denx.de/wiki/U-Boot/WebHome

← Older revision		Revision as of 21:56, 2 January 2014
Line 155:		Line 155:
	The <code>bootcmd</code> variable is a set of instructions used to relocate and boot the Linux kernel. This command will vary from machine to machine based on Flash and RAM types.		The <code>bootcmd</code> variable is a set of instructions used to relocate and boot the Linux kernel. This command will vary from machine to machine based on Flash and RAM types.

−	[[Category:Bootloaders]]	+	<!--[[Category:Bootloaders]]-->

@@ Line 6: / Line 6: @@
 By default, U-Boot is set up to automatically boot the OS after a set timeout. The following steps will interrupt the boot process and access the U-Boot prompt.
 <ol>
-<li>Configure a serial connection with the target board using the settings specified for the hardware. Refer to the [[EMAC OE Getting Started Guide]] or other documentation for more information.</li>
+<li>Configure a serial connection with the target board using the settings specified for the hardware. Refer to the [[Serial Connections]] page or other documentation for more information.</li>
 <li>After a serial connection has been established, reboot the board.</li>
 <li>When initial boot messages are printed to the serial terminal, press Enter in the serial terminal application. This should bring up the U-Boot prompt as seen below:</li>

← Older revision		Revision as of 17:52, 31 December 2013
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−	{{todo\|~~FinalDraft~~;(12-31-13-11:30->MG+)\|Michael Welling\|project=oe 4,oe 5,mw,mg,~~,FinalDraft~~,ky}}	+	{{todo\|Complete;(12-31-13-11:30->MG+);(12.31.13:11:52->KY+)\|Michael Welling\|project=oe 4,oe 5,mw,mg,Complete,ky}}

	Das U-Boot is the bootloader used on the majority of EMAC's ARM-based systems. It is loaded by the processor boot-ROM or low-level bootstrap code and performs device initialization followed by loading and starting the OS. EMAC has made modifications to U-Boot to add additional features when necessary. While generally used to load Linux, EMAC also uses U-Boot to load Windows CE and other operating systems. This page provides an introduction to U-Boot and common commands. Complete U-Boot documentation can be found at http://www.denx.de/wiki/U-Boot/WebHome		Das U-Boot is the bootloader used on the majority of EMAC's ARM-based systems. It is loaded by the processor boot-ROM or low-level bootstrap code and performs device initialization followed by loading and starting the OS. EMAC has made modifications to U-Boot to add additional features when necessary. While generally used to load Linux, EMAC also uses U-Boot to load Windows CE and other operating systems. This page provides an introduction to U-Boot and common commands. Complete U-Boot documentation can be found at http://www.denx.de/wiki/U-Boot/WebHome

← Older revision		Revision as of 17:32, 31 December 2013
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−	{{todo\|~~Review~~;(12-31-13-11:30->MG+)\|Michael Welling\|project=oe 4,oe 5,mw,~~Review~~,mg,ky}}	+	{{todo\|FinalDraft;(12-31-13-11:30->MG+)\|Michael Welling\|project=oe 4,oe 5,mw,mg,,FinalDraft,ky}}

	Das U-Boot is the bootloader used on the majority of EMAC's ARM-based systems. It is loaded by the processor boot-ROM or low-level bootstrap code and performs device initialization followed by loading and starting the OS. EMAC has made modifications to U-Boot to add additional features when necessary. While generally used to load Linux, EMAC also uses U-Boot to load Windows CE and other operating systems. This page provides an introduction to U-Boot and common commands. Complete U-Boot documentation can be found at http://www.denx.de/wiki/U-Boot/WebHome		Das U-Boot is the bootloader used on the majority of EMAC's ARM-based systems. It is loaded by the processor boot-ROM or low-level bootstrap code and performs device initialization followed by loading and starting the OS. EMAC has made modifications to U-Boot to add additional features when necessary. While generally used to load Linux, EMAC also uses U-Boot to load Windows CE and other operating systems. This page provides an introduction to U-Boot and common commands. Complete U-Boot documentation can be found at http://www.denx.de/wiki/U-Boot/WebHome

← Older revision		Revision as of 17:29, 31 December 2013
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−	{{todo\|Review\|Michael Welling\|project=oe 4,oe 5,mw,Review,mg,ky}}	+	{{todo\|Review;(12-31-13-11:30->MG+)\|Michael Welling\|project=oe 4,oe 5,mw,Review,mg,ky}}

	Das U-Boot is the bootloader used on the majority of EMAC's ARM-based systems. It is loaded by the processor boot-ROM or low-level bootstrap code and performs device initialization followed by loading and starting the OS. EMAC has made modifications to U-Boot to add additional features when necessary. While generally used to load Linux, EMAC also uses U-Boot to load Windows CE and other operating systems. This page provides an introduction to U-Boot and common commands. Complete U-Boot documentation can be found at http://www.denx.de/wiki/U-Boot/WebHome		Das U-Boot is the bootloader used on the majority of EMAC's ARM-based systems. It is loaded by the processor boot-ROM or low-level bootstrap code and performs device initialization followed by loading and starting the OS. EMAC has made modifications to U-Boot to add additional features when necessary. While generally used to load Linux, EMAC also uses U-Boot to load Windows CE and other operating systems. This page provides an introduction to U-Boot and common commands. Complete U-Boot documentation can be found at http://www.denx.de/wiki/U-Boot/WebHome

← Older revision		Revision as of 17:08, 31 December 2013
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−	{{todo\|~~Finish and polish~~\|Michael Welling\|project=oe 4,oe 5,mw,~~InProgress~~}}	+	{{todo\|Review\|Michael Welling\|project=oe 4,oe 5,mw,Review,mg,ky}}

	Das U-Boot is the bootloader used on the majority of EMAC's ARM-based systems. It is loaded by the processor boot-ROM or low-level bootstrap code and performs device initialization followed by loading and starting the OS. EMAC has made modifications to U-Boot to add additional features when necessary. While generally used to load Linux, EMAC also uses U-Boot to load Windows CE and other operating systems. This page provides an introduction to U-Boot and common commands. Complete U-Boot documentation can be found at http://www.denx.de/wiki/U-Boot/WebHome		Das U-Boot is the bootloader used on the majority of EMAC's ARM-based systems. It is loaded by the processor boot-ROM or low-level bootstrap code and performs device initialization followed by loading and starting the OS. EMAC has made modifications to U-Boot to add additional features when necessary. While generally used to load Linux, EMAC also uses U-Boot to load Windows CE and other operating systems. This page provides an introduction to U-Boot and common commands. Complete U-Boot documentation can be found at http://www.denx.de/wiki/U-Boot/WebHome

@@ Line 113: / Line 113: @@
 === Important Variables ===
-Some of the U-Boot variables need special attention as they effect the Linux kernel boot process.
+Two of the U-Boot variables need special attention as they effect the Linux kernel boot process. These variables, <code>bootargs</code> and <code>bootcmd</code>, are described in detail in the section below.
 ==== bootargs ====
-The <code>bootargs</code> variable contains parameters used by the Linux kernel during boot. It specifies the boot partition, serial console for the boot messages, and other possible boot parameters.
+The <code>bootargs</code> variable contains parameters used by the Linux kernel during boot. It specifies the boot partition, serial console for boot messages, and other possible boot parameters.
 For example, here is the bootargs string on the SoM-9G45:
@@ Line 128: / Line 129: @@
 | console || The UART device node and baud rate for the boot messages.
 |-
-| mtdparts || The size of the NAND flash partitions.  '''NOTE: This could use more information'''
+| mtdparts || Enumerates flash partition. The name and size for each partition is specified.
 |-
 | root || Sets which MTD partition to mount as the root file system.
@@ Line 150: / Line 151: @@
 | AMPIRE || 10" LCD distributed with the SoM-250ES (PPC-E10)
 |}
 ==== bootcmd ====
 The <code>bootcmd</code> variable is a set of instructions used to relocate and boot the Linux kernel. This command will vary from machine to machine based on Flash and RAM types.
 [[Category:Bootloaders]]