Embedded Linux system basis - Revision history

JulienB: /* Build system / toolchain */

2016-11-22T07:31:03Z

Build system / toolchain

← Older revision		Revision as of 09:31, 22 November 2016
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	==Build system / toolchain==		==Build system / toolchain==
	To build all these tools, you need a "build system". We use Buildroot.		To build all these tools, you need a "build system". We use [https://buildroot.org/ Buildroot].
	# This system will build a gcc cross-toolchain that will allow to generate on your PC software that can be run on your APF.		# This system will build a gcc cross-toolchain that will allow to generate on your PC software that can be run on your APF.
	# When this toolchain is ready it will compile the bootloader, the kernel and the tools of the rootfs		# When this toolchain is ready it will compile the bootloader, the kernel and the tools of the rootfs

JulienB at 07:29, 22 November 2016

2016-11-22T07:29:59Z

← Older revision		Revision as of 09:29, 22 November 2016
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	==The kernel==		==The kernel==
	In our case [https://www.kernel.org/ ~~Linux~~].		In our case [https://www.kernel.org/ Linux™].

	==The rootfs==		==The rootfs==
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	ARM9 & Cortex are registered trademarks of [https://www.arm.com/ ARM Limited].		ARM9 & Cortex are registered trademarks of [https://www.arm.com/ ARM Limited].

			Linux is a registered trademark of Linus Torvalds.

JulienB: /* The kernel */

2016-11-22T07:28:12Z

The kernel

← Older revision		Revision as of 09:28, 22 November 2016
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	==The kernel==		==The kernel==
	In our case Linux.		In our case [https://www.kernel.org/ Linux].

	==The rootfs==		==The rootfs==

JulienB: /* The bootloader */

2016-11-22T07:23:59Z

The bootloader

← Older revision		Revision as of 09:23, 22 November 2016
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	==The bootloader==		==The bootloader==
	In our case our bootloader is U-Boot. It's main role is to initialize the hardware, load the Linux kernel and launch it with the correct parameters		In our case our bootloader is [http://www.denx.de/wiki/view/U-Boot U-Boot]. It's main role is to initialize the hardware, load the Linux kernel and launch it with the correct parameters

	==The kernel==		==The kernel==

JulienB at 07:22, 22 November 2016

2016-11-22T07:22:47Z

← Older revision		Revision as of 09:22, 22 November 2016
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	An embedded Linux system is very similar (when speaking about software) to a Desktop one, thanks to the power of the latest embedded microprocessor, like the ~~ARM9 one~~.		An embedded Linux system is very similar (when speaking about software) to a Desktop one, thanks to the power of the latest embedded microprocessor cores, like the ARM9™/Cortex™ ones.
	It is composed of:		It is composed of:
	* a '''bootloader''', which is the first bits of code executed when the processor starts. It behaves like the BIOS+Grub combination on Desktop PCs.		* a '''bootloader''', which is the first bits of code executed when the processor starts. It behaves like the BIOS+Grub combination on Desktop PCs.
	* an operating system = the '''Linux kernel'''		* an operating system = the '''Linux kernel'''
	* many programs and librairies ~~organised~~ in a filesystem = the '''rootfs'''		* many programs and librairies organized in a filesystem = the '''rootfs'''

	==The bootloader==		==The bootloader==
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	==The rootfs==		==The rootfs==
	It is composed of:		It is composed of:
	* a C library		* a C library (mostly uClibc or glibc in our boards),
	* basic utilities (in our case regrouped as one executable through [[Busybox]])		* basic utilities (in our case regrouped as one executable through [[Busybox]]),
	* ~~additionnal librairies~~ and tools		* additional libraries and tools,

	==Build system / toolchain==		==Build system / toolchain==
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	# This system will build a gcc cross-toolchain that will allow to generate on your PC software that can be run on your APF.		# This system will build a gcc cross-toolchain that will allow to generate on your PC software that can be run on your APF.
	# When this toolchain is ready it will compile the bootloader, the kernel and the tools of the rootfs		# When this toolchain is ready it will compile the bootloader, the kernel and the tools of the rootfs
	# Finally it will generate images of these 3 components that can be "flashed" on your APF		# Finally it will generate images of these 3 components that can be "flashed" on your APF/OPOS module


			ARM9 & Cortex are registered trademarks of [https://www.arm.com/ ARM Limited].

JulienB at 09:08, 11 June 2010

2010-06-11T09:08:51Z

← Older revision		Revision as of 11:08, 11 June 2010
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	* additionnal librairies and tools		* additionnal librairies and tools

	~~<br>~~		==Build system / toolchain==
	To build all these tools, you need a "build system". We use Buildroot.		To build all these tools, you need a "build system". We use Buildroot.
			# This system will build a gcc cross-toolchain that will allow to generate on your PC software that can be run on your APF.
			# When this toolchain is ready it will compile the bootloader, the kernel and the tools of the rootfs
			# Finally it will generate images of these 3 components that can be "flashed" on your APF

JulienB: /* The rootfs */

2010-06-11T09:01:49Z

The rootfs

← Older revision		Revision as of 11:01, 11 June 2010
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	* basic utilities (in our case regrouped as one executable through [[Busybox]])		* basic utilities (in our case regrouped as one executable through [[Busybox]])
	* additionnal librairies and tools		* additionnal librairies and tools

			<br>
			To build all these tools, you need a "build system". We use Buildroot.

JulienB: /* The rootfs */

2010-06-11T08:59:25Z

The rootfs

← Older revision		Revision as of 10:59, 11 June 2010
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	It is composed of:		It is composed of:
	* a C library		* a C library
	* basic utilities (in our case ~~regroup~~ as one executable through Busybox)		* basic utilities (in our case regrouped as one executable through [[Busybox]])
	* additionnal librairies and tools		* additionnal librairies and tools

JulienB: /* The kernel */

2010-06-11T08:58:49Z

The kernel

← Older revision		Revision as of 10:58, 11 June 2010
Line 9:		Line 9:

	==The kernel==		==The kernel==
			In our case Linux.

	==The rootfs==		==The rootfs==

JulienB: creation

2008-06-20T21:33:21Z

creation

New page

An embedded Linux system is very similar (when speaking about software) to a Desktop one, thanks to the power of the latest embedded microprocessor, like the ARM9 one.
It is composed of:
* a '''bootloader''', which is the first bits of code executed when the processor starts. It behaves like the BIOS+Grub combination on Desktop PCs.
* an operating system = the '''Linux kernel'''
* many programs and librairies organised in a filesystem = the '''rootfs'''

==The bootloader==
In our case our bootloader is U-Boot. It's main role is to initialize the hardware, load the Linux kernel and launch it with the correct parameters

==The kernel==

==The rootfs==
It is composed of:
* a C library
* basic utilities (in our case regroup as one executable through Busybox)
* additionnal librairies and tools