Dev/Embedded/FromScratch - Revision history

Drizzt: /* UserLand */

2025-01-03T17:52:57Z

UserLand

← Older revision		Revision as of 19:52, 3 January 2025
Line 76:		Line 76:
	The rootfs is the part which the kernel is looking for in order to mount it as the root ("/") of the filesystems stack/tree, and where it will need to find your init binary. It can be reduced to an initramfs file containing a single init binary file.		The rootfs is the part which the kernel is looking for in order to mount it as the root ("/") of the filesystems stack/tree, and where it will need to find your init binary. It can be reduced to an initramfs file containing a single init binary file.

	Also note that though this "userland" holds everything that will run in user-space, it will also hold your modules, which will run in kernel-space. Some more information about this "kernel space" and "user space" separation can be found [https://en.wikipedia.org/wiki/User_space_and_kernel_space ~~on this "~~User space and kernel space" wikipedia page]].		Also note that though this "userland" holds everything that will run in user-space, it will also hold your modules, which will run in kernel-space. Some more information about this "kernel space" and "user space" separation can be found on this "[https://en.wikipedia.org/wiki/User_space_and_kernel_space User space and kernel space]]" wikipedia page.

	=== Chose a solution for your base system ===		=== Chose a solution for your base system ===

Drizzt: /* System content */

2024-12-30T01:37:24Z

System content

← Older revision		Revision as of 03:37, 30 December 2024
Line 24:		Line 24:
	* The bootloader		* The bootloader
	* The Linux kernel		* The Linux kernel
	* The ~~userspace~~		* The "UserLand"

	These three parts may be split further, but it's the basics.		These three parts may be split further, but it's the basics.

Drizzt: /* Userspace */

2024-12-30T01:28:13Z

Userspace

← Older revision		Revision as of 03:28, 30 December 2024
Line 67:		Line 67:
	Detailed information will be found on '''[[Dev/Embedded/FromScratch/LinuxKernel\|the page dedicated to the Linux Kernel]]'''.		Detailed information will be found on '''[[Dev/Embedded/FromScratch/LinuxKernel\|the page dedicated to the Linux Kernel]]'''.

	== ~~Userspace~~ ==		== UserLand ==
	The "last" part you'll need to get a running system is the "~~userspace~~", which is simply all the binaries (executables), the libraries, the configuration files, the scripts, and all the other files and directories required by the system and your application.		The "last" part you'll need to get a running system is the "userland", which is simply all the binaries (executables), the libraries, the configuration files, the scripts, and all the other files and directories required by the system and your application.

	This "~~userspace~~" is usually split in two parts : the "base system", and your application(s).<br />		This "userland" is usually split in two parts : the "base system", and your application(s).<br />
	The "base system" is the part you get from an external source (or many), while the "application" part is pretty obvious : it's your own code and data.		The "base system" is the part you get from an external source (or many), while the "application" part is pretty obvious : it's your own code and data.

	Note that there are many confusions out there : some call the "base system" the "rootfs", others even add the application, though the "rootfs" can be either all (base + app) or only a subpart (not even whole base).<br />		Note that there are many confusions out there : some call the "base system" the "rootfs", others even add the application, though the "rootfs" can be either all (base + app) or only a subpart (not even whole base).<br />
	The rootfs is the part which the kernel is looking for in order to mount it as the root ("/") of the filesystems stack/tree, and where it will need to find your init binary. It can be reduced to an initramfs file containing a single init binary file.		The rootfs is the part which the kernel is looking for in order to mount it as the root ("/") of the filesystems stack/tree, and where it will need to find your init binary. It can be reduced to an initramfs file containing a single init binary file.

			Also note that though this "userland" holds everything that will run in user-space, it will also hold your modules, which will run in kernel-space. Some more information about this "kernel space" and "user space" separation can be found [https://en.wikipedia.org/wiki/User_space_and_kernel_space on this "User space and kernel space" wikipedia page]].

	=== Chose a solution for your base system ===		=== Chose a solution for your base system ===

	To build the base part of your ~~userspace~~ you have a few options :		To build the base part of your userland you have a few options :
	* Build everything from scratch (follow [https://www.linuxfromscratch.org/ Linux From Scratch ] instructions, I will not explain it on this Wiki).		* Build everything from scratch (follow [https://www.linuxfromscratch.org/ Linux From Scratch ] instructions, I will not explain it on this Wiki).
	* Use [https://busybox.net/ BusyBox] : recommended for space constrained systems. Get more information for this choice '''[[Dev/Embedded/Rootfs/BusyBox\|on the BusyBox dedicated page]]'''.		* Use [https://busybox.net/ BusyBox] : recommended for space constrained systems. Get more information for this choice '''[[Dev/Embedded/Rootfs/BusyBox\|on the BusyBox dedicated page]]'''.

Drizzt: /* Chose a solution for your base system */

2024-12-30T01:04:34Z

Chose a solution for your base system

← Older revision		Revision as of 03:04, 30 December 2024
Line 79:		Line 79:

	To build the base part of your userspace you have a few options :		To build the base part of your userspace you have a few options :
	* Build everything from scratch (follow [https://www.linuxfromscratch.org/ Linux From Scratch ] instructions, I will not explain it on this Wiki)		* Build everything from scratch (follow [https://www.linuxfromscratch.org/ Linux From Scratch ] instructions, I will not explain it on this Wiki).
	* Use [https://busybox.net/ BusyBox] : recommended for space constrained systems. Get more information for this choice '''[[Dev/Embedded/Rootfs/BusyBox\|on the BusyBox dedicated page]]'''.		* Use [https://busybox.net/ BusyBox] : recommended for space constrained systems. Get more information for this choice '''[[Dev/Embedded/Rootfs/BusyBox\|on the BusyBox dedicated page]]'''.
	* Use a GNU/Linux distribution : the easy way (I'm using [https://www.devuan.org/ Devuan GNU/Linux], but many other distribution may fit, just avoid those targeting only desktop or those making stupid choices). Also get more information for this choice '''[[Dev/Embedded/Rootfs/Devuan/FromScratch\|on my "Devuan from scratch" dedicated page]]'''.		* Use a GNU/Linux distribution : the easy way (I'm using [https://www.devuan.org/ Devuan GNU/Linux], but many other distribution may fit, just avoid those targeting only desktop or those making stupid choices). Also get more information for this choice '''[[Dev/Embedded/Rootfs/Devuan/FromScratch\|on my "Devuan from scratch" dedicated page]]'''.
	* Use an image provided from a third party (well, I'll never trust any of these, but it's up to you)		* Use an image provided from a third party (well, I'll never trust any of these, but it's up to you).
	* Use an image builder tool (there's some unusable ones out there, [[Dev/Embedded/NotOEYocto\|Yocto]] may be the most popular, but I strongly advise against these "solutions")		* Use an image builder tool (there's some unusable ones out there, [[Dev/Embedded/NotOEYocto\|Yocto]] may be the most popular, but I strongly advise against these "solutions").

	=== Organize your data ===		=== Organize your data ===

Drizzt: /* Chose a solution for your base system */

2024-12-30T01:03:57Z

Chose a solution for your base system

← Older revision		Revision as of 03:03, 30 December 2024
Line 80:		Line 80:
	To build the base part of your userspace you have a few options :		To build the base part of your userspace you have a few options :
	* Build everything from scratch (follow [https://www.linuxfromscratch.org/ Linux From Scratch ] instructions, I will not explain it on this Wiki)		* Build everything from scratch (follow [https://www.linuxfromscratch.org/ Linux From Scratch ] instructions, I will not explain it on this Wiki)
	* Use [https://busybox.net/ BusyBox] : recommended for space constrained systems. Get more information for this choice [[Dev/Embedded/Rootfs/BusyBox\|on the BusyBox dedicated page]].		* Use [https://busybox.net/ BusyBox] : recommended for space constrained systems. Get more information for this choice '''[[Dev/Embedded/Rootfs/BusyBox\|on the BusyBox dedicated page]]'''.
	* Use a GNU/Linux distribution : the easy way (I'm using [https://www.devuan.org/ Devuan GNU/Linux], but many other distribution may fit, just avoid those targeting only desktop or those making stupid choices). Also get more information for this choice [[Dev/Embedded/Rootfs/Devuan/FromScratch\|on my "Devuan from scratch" dedicated page]].		* Use a GNU/Linux distribution : the easy way (I'm using [https://www.devuan.org/ Devuan GNU/Linux], but many other distribution may fit, just avoid those targeting only desktop or those making stupid choices). Also get more information for this choice '''[[Dev/Embedded/Rootfs/Devuan/FromScratch\|on my "Devuan from scratch" dedicated page]]'''.
	* Use an image provided from a third party (well, I'll never trust any of these, but it's up to you)		* Use an image provided from a third party (well, I'll never trust any of these, but it's up to you)
	* Use an image builder tool (there's some unusable ones out there, [[Dev/Embedded/NotOEYocto\|Yocto]] may be the most popular, but I strongly advise against these "solutions")		* Use an image builder tool (there's some unusable ones out there, [[Dev/Embedded/NotOEYocto\|Yocto]] may be the most popular, but I strongly advise against these "solutions")

Drizzt: /* Chose a solution for your base system */

2024-12-30T01:03:26Z

Chose a solution for your base system

← Older revision		Revision as of 03:03, 30 December 2024
Line 81:		Line 81:
	* Build everything from scratch (follow [https://www.linuxfromscratch.org/ Linux From Scratch ] instructions, I will not explain it on this Wiki)		* Build everything from scratch (follow [https://www.linuxfromscratch.org/ Linux From Scratch ] instructions, I will not explain it on this Wiki)
	* Use [https://busybox.net/ BusyBox] : recommended for space constrained systems. Get more information for this choice [[Dev/Embedded/Rootfs/BusyBox\|on the BusyBox dedicated page]].		* Use [https://busybox.net/ BusyBox] : recommended for space constrained systems. Get more information for this choice [[Dev/Embedded/Rootfs/BusyBox\|on the BusyBox dedicated page]].
	* Use a GNU/Linux distribution : the easy way (I'm using [https://www.devuan.org/ Devuan GNU/Linux], but many other distribution may fit, just avoid those targeting only desktop or those making stupid choices). Also get more information for this choice [[Dev/Embedded/Rootfs/Devuan\|on ~~the~~ Devuan dedicated page]].		* Use a GNU/Linux distribution : the easy way (I'm using [https://www.devuan.org/ Devuan GNU/Linux], but many other distribution may fit, just avoid those targeting only desktop or those making stupid choices). Also get more information for this choice [[Dev/Embedded/Rootfs/Devuan/FromScratch\|on my "Devuan from scratch" dedicated page]].
	* Use an image provided from a third party (well, I'll never trust any of these, but it's up to you)		* Use an image provided from a third party (well, I'll never trust any of these, but it's up to you)
	* Use an image builder tool (there's some unusable ones out there, [[Dev/Embedded/NotOEYocto\|Yocto]] may be the most popular, but I strongly advise against these "solutions")		* Use an image builder tool (there's some unusable ones out there, [[Dev/Embedded/NotOEYocto\|Yocto]] may be the most popular, but I strongly advise against these "solutions")

Drizzt: /* Chose a solution for your base system */

2024-12-21T21:14:22Z

Chose a solution for your base system

← Older revision		Revision as of 23:14, 21 December 2024
Line 80:		Line 80:
	To build the base part of your userspace you have a few options :		To build the base part of your userspace you have a few options :
	* Build everything from scratch (follow [https://www.linuxfromscratch.org/ Linux From Scratch ] instructions, I will not explain it on this Wiki)		* Build everything from scratch (follow [https://www.linuxfromscratch.org/ Linux From Scratch ] instructions, I will not explain it on this Wiki)
	* Use [https://busybox.net/ BusyBox] : recommended for space constrained systems. Get more information for this choice [[Dev/Embedded/~~FromScratch~~/BusyBox\|on the BusyBox dedicated page]].		* Use [https://busybox.net/ BusyBox] : recommended for space constrained systems. Get more information for this choice [[Dev/Embedded/Rootfs/BusyBox\|on the BusyBox dedicated page]].
	* Use a GNU/Linux distribution : the easy way (I'm using [https://www.devuan.org/ Devuan GNU/Linux], but many other distribution may fit, just avoid those targeting only desktop or those making stupid choices). Also get more information for this choice [[Dev/Embedded/~~FromScratch~~/Devuan\|on the Devuan dedicated page]].		* Use a GNU/Linux distribution : the easy way (I'm using [https://www.devuan.org/ Devuan GNU/Linux], but many other distribution may fit, just avoid those targeting only desktop or those making stupid choices). Also get more information for this choice [[Dev/Embedded/Rootfs/Devuan\|on the Devuan dedicated page]].
	* Use an image provided from a third party (well, I'll never trust any of these, but it's up to you)		* Use an image provided from a third party (well, I'll never trust any of these, but it's up to you)
	* Use an image builder tool (there's some unusable ones out there, [[Dev/Embedded/NotOEYocto\|Yocto]] may be the most popular, but I strongly advise against these "solutions")		* Use an image builder tool (there's some unusable ones out there, [[Dev/Embedded/NotOEYocto\|Yocto]] may be the most popular, but I strongly advise against these "solutions")

Drizzt: /* Userspace */

2024-12-21T20:39:13Z

Userspace

← Older revision		Revision as of 22:39, 21 December 2024
Line 84:		Line 84:
	* Use an image provided from a third party (well, I'll never trust any of these, but it's up to you)		* Use an image provided from a third party (well, I'll never trust any of these, but it's up to you)
	* Use an image builder tool (there's some unusable ones out there, [[Dev/Embedded/NotOEYocto\|Yocto]] may be the most popular, but I strongly advise against these "solutions")		* Use an image builder tool (there's some unusable ones out there, [[Dev/Embedded/NotOEYocto\|Yocto]] may be the most popular, but I strongly advise against these "solutions")

			=== Organize your data ===

			=== Configuration ===

			=== Auto-run your application ===

			== Burn, Flash, Upload, Remote booting, ... ==

Drizzt: /* Userspace */

2024-12-21T20:30:53Z

Userspace

← Older revision		Revision as of 22:30, 21 December 2024
Line 68:		Line 68:

	== Userspace ==		== Userspace ==
			The "last" part you'll need to get a running system is the "userspace", which is simply all the binaries (executables), the libraries, the configuration files, the scripts, and all the other files and directories required by the system and your application.

			This "userspace" is usually split in two parts : the "base system", and your application(s).<br />
			The "base system" is the part you get from an external source (or many), while the "application" part is pretty obvious : it's your own code and data.

			Note that there are many confusions out there : some call the "base system" the "rootfs", others even add the application, though the "rootfs" can be either all (base + app) or only a subpart (not even whole base).<br />
			The rootfs is the part which the kernel is looking for in order to mount it as the root ("/") of the filesystems stack/tree, and where it will need to find your init binary. It can be reduced to an initramfs file containing a single init binary file.

			=== Chose a solution for your base system ===

			To build the base part of your userspace you have a few options :
			* Build everything from scratch (follow [https://www.linuxfromscratch.org/ Linux From Scratch ] instructions, I will not explain it on this Wiki)
			* Use [https://busybox.net/ BusyBox] : recommended for space constrained systems. Get more information for this choice [[Dev/Embedded/FromScratch/BusyBox\|on the BusyBox dedicated page]].
			* Use a GNU/Linux distribution : the easy way (I'm using [https://www.devuan.org/ Devuan GNU/Linux], but many other distribution may fit, just avoid those targeting only desktop or those making stupid choices). Also get more information for this choice [[Dev/Embedded/FromScratch/Devuan\|on the Devuan dedicated page]].
			* Use an image provided from a third party (well, I'll never trust any of these, but it's up to you)
			* Use an image builder tool (there's some unusable ones out there, [[Dev/Embedded/NotOEYocto\|Yocto]] may be the most popular, but I strongly advise against these "solutions")

Drizzt: /* Linux Kernel */

2024-12-09T15:11:48Z

Linux Kernel

← Older revision		Revision as of 17:11, 9 December 2024
Line 65:		Line 65:
	It's purpose is to handle the hardware and provide an unified interface to the user-space programs. As such, it has to be taillored to the effective hardware present on your system.		It's purpose is to handle the hardware and provide an unified interface to the user-space programs. As such, it has to be taillored to the effective hardware present on your system.

	Detailed information will be found on [[Dev/Embedded/FromScratch/LinuxKernel\|the page dedicated to the Linux Kernel]].		Detailed information will be found on '''[[Dev/Embedded/FromScratch/LinuxKernel\|the page dedicated to the Linux Kernel]]'''.

	== Userspace ==		== Userspace ==