Difference between revisions of "Architecture"

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m (Categorized: Hardware)
(Deleted on request from kaniini - it is a fantasy land, things does not work as described)
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== Alpine Hardware Architecture ("arch") Support ==
 
=== x86 Based ===
 
* [[x86]] - 32 bit x86 (ia32)
 
* [[x86_64]] - 64 bit x86 (amd64)
 
  
=== ARM Based ===
 
* [[armhf]] - 32 bit ARM (hard-float ABI)
 
* [[aarch64]] - 64 bit ARM
 
 
=== PowerPC Based ===
 
* [[ppc64le]] - 64 bit PowerPC (little-endian)
 
 
=== IBM System Z Based ===
 
* [[s390x]]
 
 
== Alpine Packaging ==
 
 
=== Package Building ===
 
 
==== Alpine Package Building Ports ====
 
* [[APKBUILD]] - Package build scripts
 
* [[aports]] - Official Alpine ports git repository
 
 
==== Package Building Tools ====
 
* [[abuild]]
 
 
 
=== Package Format ===
 
Alpine uses packages in the [[.apk file format]].
 
 
=== Package Management Tools ===
 
* [[apk]] - Alpine Package Keeper (see [[apk internals]] for more detail)
 
 
== Boot Process ==
 
 
=== Boot Loader ===
 
==== EFI ====
 
==== BIOS ====
 
==== Other ====
 
 
=== Kernel ===
 
==== Versioning ====
 
===== Flavors =====
 
* vanilla
 
* hardened
 
* virthardened
 
* rpi
 
 
==== Signing ====
 
==== Command line options ====
 
 
* modules="<modules>" - specify list of modules to be loaded by initramfs /init needed to mount real root filesystem.
 
 
=== Initfs ===
 
The kernel will decompress the stream of compressed cpio archives passed to it by the 'append' [[Bootloaders|bootloader]] option to the root of 'rootfs', a tmpfs automatically mounted at '/' by the kernel at boot.
 
 
==== '/init' Script ====
 
Not to be confused with '/sbin/init', the '/init' script in the root of the 'rootfs' is called by the kernel upon completion of its boot process, and is responsible for doing whatever steps are necessary to mount the real root file system to '/' and transfer control to '/sbin/init'.
 
 
* Parses kernel command line options.
 
* Uses [[nlplug-findfs]] to discover devices.
 
 
==== Initfs Module Handling ====
 
Modules required to mount the root filesystem and boot must either built into the kernel or available from with the initramfs filesystem through use of appended initrd cpio.gz files provided by the [[bootloader]].
 
 
The /init script will first [[modprobe]] the modules specified by the modules= kernel command line option and by the name of the specified rootfs type. It will then load the contents of /etc/modules, which may include module options.
 
Modules may be blacklisted from autoprobing (but NOT explicit insertion!) using the blacklist= kernel command line option which appends blacklist entries to '/etc/modprobe.d/boot-opt-blacklist.conf'.
 
 
==== Minimal Required Set ====
 
===== Directory Structure =====
 
* / /bin /boot /dev /etc /lib /lib/modules /media /media/cdrom /media/usb /mnt /proc /sbin /sys /usr /usr/bin /usr/sbin
 
===== Devices =====
 
* /dev/null
 
* /dev/console
 
* /dev/kmsg
 
 
===== Mounts =====
 
* /proc
 
* /sys
 
* /dev (can be disabled?)
 
 
===== Configuration =====
 
* /etc/passwd
 
* /etc/group
 
* /etc/fstab
 
 
===== Binaries =====
 
* [[busybox]]
 
* [[apk]]
 
 
==== Feature Sets ====
 
Feature sets consist of lists for the set of modules and files that need to be included in a final initramfs to support the indicated feature.
 
 
=== Init ===
 
Not to be confused with the '/init' script in the initramfs, '/sbin/init' is the first process to be started in the live system after the initramfs completes its work.
 
 
==== Module Loading ====
 
'/etc/init.d/modules' loads all modules specified in '/etc/modules' and '/(etc|run|usr/lib|lib)/modules-load.d/*.conf'
 
 
[[Category:Hardware]]
 

Revision as of 19:29, 7 January 2018