Embedded Linux system basis - Revision history

JulienB: /* Build system / toolchain */

2016-11-22T07:31:03Z

‎Build system / toolchain

JulienB at 07:29, 22 November 2016

2016-11-22T07:29:59Z

JulienB: /* The kernel */

2016-11-22T07:28:12Z

‎The kernel

JulienB: /* The bootloader */

2016-11-22T07:23:59Z

‎The bootloader

JulienB at 07:22, 22 November 2016

2016-11-22T07:22:47Z

JulienB at 09:08, 11 June 2010

2010-06-11T09:08:51Z

JulienB: /* The rootfs */

2010-06-11T09:01:49Z

‎The rootfs

JulienB: /* The rootfs */

2010-06-11T08:59:25Z

‎The rootfs

JulienB: /* The kernel */

2010-06-11T08:58:49Z

‎The kernel

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

@@ Line 18: / Line 18: @@
 ==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.
 # When this toolchain is ready it will compile the bootloader, the kernel and the tools of the rootfs

@@ Line 9: / Line 9: @@
 ==The kernel==
-In our case [https://www.kernel.org/ Linux].
+In our case [https://www.kernel.org/ Linux™].
 ==The rootfs==
@@ Line 25: / Line 25: @@
 ARM9 & Cortex are registered trademarks of [https://www.arm.com/ ARM Limited].

@@ Line 9: / Line 9: @@
 ==The kernel==
-In our case Linux.
+In our case [https://www.kernel.org/ Linux].
 ==The rootfs==

@@ Line 1: / Line 1: @@
-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:
 * 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'''
+* many programs and librairies organized in a filesystem = the '''rootfs'''
 ==The bootloader==
@@ Line 13: / Line 13: @@
 ==The rootfs==
 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==
@@ Line 21: / Line 21: @@
 # 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
+# Finally it will generate images of these 3 components that can be "flashed" on your APF/OPOS module

@@ Line 17: / Line 17: @@
 * additionnal librairies and tools
-<br>
+==Build system / toolchain==
 To build all these tools, you need a "build system". We use Buildroot.

@@ Line 6: / Line 6: @@
 ==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==

← Older revision		Revision as of 09:01, 11 June 2010
Line 16:		Line 16:
	* 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.

← Older revision		Revision as of 08:58, 11 June 2010
Line 9:		Line 9:

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

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