ECE497 Modifying Kernel Command Line Parameters - Revision history

Yoder at 17:11, 18 May 2013

2013-05-18T17:11:01Z

2011-04-28T20:13:41Z

2011-04-28T20:05:45Z

2011-04-28T20:05:28Z

2011-04-28T20:05:08Z

2011-04-28T20:04:29Z

2011-04-28T19:59:37Z

‎Makefile version

2011-04-28T19:58:02Z

‎Makefile version

2011-04-28T19:55:49Z

2011-04-28T19:50:12Z

‎Replacing the old boot.scr

← Older revision		Revision as of 17:11, 18 May 2013
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−	[[Category:~~ECE497~~]]	+	[[Category:ECE497Spring2011]]
	The Linux kernel is booted with a series of parameters known as the ''kernel command line''. On the BeagleBoard, the uBoot bootloader handles both the booting and the passing of parameters. A typical command line on the BeagleBoard might look something like this:		The Linux kernel is booted with a series of parameters known as the ''kernel command line''. On the BeagleBoard, the uBoot bootloader handles both the booting and the passing of parameters. A typical command line on the BeagleBoard might look something like this:

@@ Line 6: / Line 6: @@
 Modification of the kernel command line is necessary for things like:
-[[ECE497 Static MAC Addresses | Static MAC Addresses]] or
+[[ECE497_Tips_and_Tricks#Using_u-boot_to_specify_a_MAC_address_at_boot | Static MAC Addresses]] or
 [[ECE497 Pico Projector | Using the TI Pico Projector]]

@@ Line 1: / Line 1: @@
 [[Category:ECE497]]
-The linux kernel is booted with a series of parameters known as the ''kernel command line''. On the BeagleBoard, the uBoot bootloader handles both the booting and the passing of parameters. A typical command line on the BeagleBoard might look something like this:
+The Linux kernel is booted with a series of parameters known as the ''kernel command line''. On the BeagleBoard, the uBoot bootloader handles both the booting and the passing of parameters. A typical command line on the BeagleBoard might look something like this:
   #console=ttyS2,115200n8 console=tty0 root=/dev/mmcblk0p2 rw rootwait

@@ Line 1: / Line 1: @@
-[[Category:Name]]
+[[Category:ECE497]]
-−
 The linux kernel is booted with a series of parameters known as the ''kernel command line''. On the BeagleBoard, the uBoot bootloader handles both the booting and the passing of parameters. A typical command line on the BeagleBoard might look something like this:

← Older revision		Revision as of 20:05, 28 April 2011
Line 1:		Line 1:
		+	[[Category:Name]]
		+
	The linux kernel is booted with a series of parameters known as the ''kernel command line''. On the BeagleBoard, the uBoot bootloader handles both the booting and the passing of parameters. A typical command line on the BeagleBoard might look something like this:		The linux kernel is booted with a series of parameters known as the ''kernel command line''. On the BeagleBoard, the uBoot bootloader handles both the booting and the passing of parameters. A typical command line on the BeagleBoard might look something like this:

@@ Line 5: / Line 5: @@
 Modification of the kernel command line is necessary for things like:
-[[ECE497 Static MAC Addresses]] or
+[[ECE497 Static MAC Addresses | Static MAC Addresses]] or
-[[ECE497 Pico Projector]]
+[[ECE497 Pico Projector | Using the TI Pico Projector]]
 In order to edit the command line, we need to edit a few uBoot files.

← Older revision		Revision as of 19:59, 28 April 2011
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	install: boot.scr user.scr		install: boot.scr user.scr
	scp *.scr root@beagleboard:/media/mmcblk0p1/		scp *.scr root@beagleboard:/media/mmcblk0p1/
		+
		+	So, in order to compile both boot.cmd and user.cmd into .scr files and install them on the BeagleBoard, just run:
		+	make && make install

← Older revision		Revision as of 19:58, 28 April 2011
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	== Makefile version ==		== Makefile version ==
		+	In order to simplify this overly complex process, we can use a Makefile like the one below:
		+
		+	# Makefile to create boot.scr and user.scr for uBoot
		+	#
		+	# Author: Michael Lester
		+
		+	all: boot.scr user.scr
		+
		+	boot.scr: boot.cmd
		+	mkimage -A arm -O linux -T script -C none -a 0 -e 0 -n 'Execute uImage' -d boot.cmd boot.scr
		+
		+	user.scr: user.cmd
		+	mkimage -A arm -O linux -T script -C none -a 0 -e 0 -n 'Boot Ramdisk' -d user.cmd user.scr
		+
		+	install: boot.scr user.scr
		+	scp *.scr root@beagleboard:/media/mmcblk0p1/

← Older revision		Revision as of 19:55, 28 April 2011
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	Next time you boot, the kernel will be passed your newly added parameters!		Next time you boot, the kernel will be passed your newly added parameters!
		+
		+	If you have ssh access to your BeagleBoard, you can install your newly created boot.scr with the following command:
		+	scp boot.scr root@beagleboard:/media/mmcblk0p1/
		+	just be sure to replace 'beagleboard' with your BeagleBoard's hostname or IP address
		+
		+	== User.scr ==
		+	If the USER button is held while the BeagleBoard boots, uBoot will look for the file user.scr instead of boot.scr. This gives us the chance to boot the kernel with two different command lines (or even boot another kernel all together).
		+
		+	The process for modifying or creating a user.scr file is the same as boot.scr, just change the filename.
		+
		+	== Makefile version ==

← Older revision		Revision as of 19:50, 28 April 2011
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	=== Replacing the old boot.scr ===		=== Replacing the old boot.scr ===
	Once the new boot.scr file has been created, place it in the root directory of the BeagleBoard's SD card (the same directory as uImage).		Once the new boot.scr file has been created, place it in the root directory of the BeagleBoard's SD card (the same directory as uImage).
		+
		+	Next time you boot, the kernel will be passed your newly added parameters!