Initial arm64 / aarch64 support

Relevant changes:

* arm64 (ARM64 in terms of FAI class) is considered a valid and
  supported architecture within grml-live now; updated documentation,
  configuration files and zsh completion accordingly

* arm64 was enabled as supported architecture in grml repositories

* the architecture specific grml-scripts + grml-scripts-core packages
  got built for arm64 and uploaded to the grml-testing repository

* memtest86+ + syslinux aren't available on arm64, therefore move
  memtest86+ to Recommends to avoid ending up with an `Arch: any`
  package, also depend on either syslinux or syslinux-efi

* Software related changes in GRML* (other than the obvious
  linux-image-arm64 and further arm64 specific packages):

  * GRMLBASE:

    - grml2usb is I386 + AMD64 specific for now (if we want to use
      grml2usb on arm64 as well, we'd need to port it)

    - grub-efi-amd64-bin, grub-efi-ia32-bin + grub-pc as well as
      syslinux, syslinux-common + syslinux-utils all are also
      I386 + AMD64 specific

  * GRML_FULL:

    - cciss-vol-status, cmospwd, cpuid, grub-pc-bin + ltrace all
      are I386 + AMD64 specific (so not available for arm64)

    - grml-terminalserver is I386 + AMD64 specific for now (at least
      until we ported grml2usb for arm64)

* /etc/grml/fai/config/scripts/GRMLBASE/44-grub: invocation of
  grub-mkimage is I386 + AMD64 specific (at least until we identify
  whether there's an actual use-case for our generated
  /boot/grub/core.img)

* /etc/grml/fai/config/scripts/GRMLBASE/45-grub-images: we use
  /boot/bootaa64.efi for the EFI boot image name for arm64, though need
  to skip the unavailable efi_uga module and also skipt the i386-pc
  architecture, since grub on arm64 doesn't provide /usr/lib/grub/i386-efi

Known TODOs:

* decide official naming for Grml on arm64 (also keep e.g.
  `update-grml-rescueboot -t small -a 64` in mind!)

* grml2usb isn't available for arm64 yet, and therefore also
  grml-terminalserver isn't available for arm64

* when booting the resulting ISO inside an arm64 / aarch64, the default
  terminal seems to start up as /dev/ttyAMA0 (instead of /dev/tty1, as
  expected and handled via our getty@tty1.service)

* look into SecureBoot support

Development sponsored by netcup GmbH

debian/control

@@ -24,21 +24,21 @@ Depends:
  fai-client (>= 3.4.0),
  isolinux (>= 3:6.03+dfsg-5+deb8u1~),
  jo,
- memtest86+,
  mksh,
  moreutils,
  mtools,
  pciutils,
  rsync,
  squashfs-tools (>= 1:4.2-0~bpo60),
- syslinux,
+ syslinux | syslinux-efi,
  xorriso,
  ${misc:Depends},
 Recommends:
  grml-live-db,
  grub-pc-bin,
  imagemagick,
  ipxe,
+ memtest86+,
  syslinux-utils,
 Suggests:
  fai-doc,

docs/grml-live.txt

@@ -62,8 +62,8 @@ Use the specified architecture instead of the currently running one.  This
 allows building a 32bit system on a 64bit host (though you can't build a 64bit
 system on a 32bit system/kernel of course). Please notice that real
 crosscompiling (like building a ppc system on x86) isn't possible due to the
-nature and the need of working in a chroot. Currently supported values: i386
-and amd64.
+nature and the need of working in a chroot. Currently supported values: i386,
+amd64 and arm64.
 
   -b::
 
@@ -82,7 +82,7 @@ really know that you do not want to update the chroot.
   -c **CLASSES**::
 
 Specify the CLASSES to be used for building the ISO via FAI.  By default only
-the classes GRMLBASE, GRML_FULL and I386/AMD64 (depending on system
+the classes GRMLBASE, GRML_FULL and I386/AMD64/ARM64 (depending on system
 architecture) are assumed.  Additionally you can specify a class providing a
 (grml-)kernel (see <<classes,the 'CLASSES' section in this document>> for
 details about available classes). So instead of GRML_FULL you can also use e.g.
@@ -297,9 +297,9 @@ losing the simplicity in the build process.
 The main and base class provided by grml-live is named GRMLBASE. It's strongly
 recommended to **always** use the class GRMLBASE when building an ISO using
 grml-live, as well as the architecture dependent class which provides the kernel
-(being 'I386' for x86_32 and 'AMD64' for x86_64) and a GRML_* class (like
-GRML_SMALL or GRML_FULL). The following files and directories are
-relevant for class GRMLBASE by default:
+(being 'I386' for x86_32, 'AMD64' for x86_64 and 'ARM64' for arm64) and a GRML_*
+class (like GRML_SMALL or GRML_FULL).
+The following files and directories are relevant for class GRMLBASE by default:
 
   ${GRML_FAI_CONFIG}/config/scripts/GRMLBASE/
   ${GRML_FAI_CONFIG}/config/debconf/GRMLBASE
@@ -312,10 +312,10 @@ files/directories.
 
 If you want to use your own configuration, extend an existing configuration
 and/or add additional packages to your ISO just invent a new class (or extend an
-existing one). For example if you want to use your own class named "FOOBAR" just
-set CLASSES="GRMLBASE,GRML_SMALL,AMD64,FOOBAR" inside /etc/grml/grml-live.local
-or invoke grml-live using the classes option: "grml-live -c
-GRMLBASE,GRML_SMALL,AMD64,FOOBAR ...".
+existing one). For example if you want to use your own class named "FOOBAR" on
+your amd64 build, et CLASSES="GRMLBASE,GRML_SMALL,AMD64,FOOBAR" inside
+/etc/grml/grml-live.local or invoke grml-live using the classes option:
+"grml-live -c GRMLBASE,GRML_SMALL,AMD64,FOOBAR ...".
 
 More details regarding the class concept can be found in the documentation of
 FAI itself (being available at /usr/share/doc/fai-doc/).
@@ -544,6 +544,7 @@ Instructions
   # mkdir -p /etc/grml/fai/config/basefiles/
   # mv I386.tar.gz /etc/grml/fai/config/basefiles/
   # mv AMD64.tar.gz /etc/grml/fai/config/basefiles/
+  # mv ARM64.tar.gz /etc/grml/fai/config/basefiles/
 
   # install relevant tools
   apt-get --no-install-recommends install grml-live
@@ -705,26 +706,27 @@ syslinux, used by default for official Grml images) then just execute:
   % isohybrid grml.iso
 
 [[create-a-base-tgz]]
-How do I create a base tar.gz (I386.tar.gz or AMD64.tar.gz)
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+How do I create a base tar.gz (I386.tar.gz or AMD64.tar.gz or ARM64.tar.gz)
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 [[basetgz]]
 
 First of all create the chroot using debootstrap (requires root):
 
   BASECHROOT='/tmp/basefile'  # path where the chroot gets generated
   SUITE='bookworm'              # using the current stable release should always work
-  debootstrap --exclude=info,tasksel,tasksel-data "$SUITE" "$BASECHROOT" http://ftp.debian.org/debian
+  debootstrap --exclude=info,tasksel,tasksel-data,isc-dhcp-client,isc-dhcp-common "$SUITE" "$BASECHROOT" http://deb.debian.org/debian
   tar -C "$BASECHROOT" --exclude='var/cache/apt/archives/*.deb' -zcf "${SUITE}".tar.gz ./
 
 [TIP]
 By default debootstrap builds a chroot matching the architecture of the running
 host system. If you're using an amd64 system and want to build an i386 base.tgz
 then invoke debootstrap using the '--arch i386' option. Disclaimer: building an
 AMD64 base.tgz won't work if you are using a 32bit kernel system of course.
+Also building an ARM64 base.tgz requires an arm64 system.
 
 Finally place the generated tarball in /etc/grml/fai/config/basefiles/ (note
 that it needs to be uppercase letters matching the class names, so: e.g.
-AMD64.tar.gz for amd64 and I386.tar.gz for i386).
+AMD64.tar.gz for amd64, I386.tar.gz for i386 or ARM64.tar.gz for arm64).
 
 Then executing grml-live should use this file as base system instead of executing
 debootstrap. Check out the output for something like:

etc/grml/fai/config/package_config/GRMLBASE

@@ -13,7 +13,6 @@ eject
 fdisk
 file
 gpm
-grml2usb
 grml-autoconfig
 grml-crypt
 grml-debian-keyring
@@ -28,9 +27,6 @@ grml-scripts
 grml-scripts-core
 grml-tips
 grml-udev-config
-grub-efi-amd64-bin
-grub-efi-ia32-bin
-grub-pc
 haveged
 hdparm
 hwinfo
@@ -51,7 +47,6 @@ resolvconf
 rsync
 rsyslog
 strace
-syslinux syslinux-common syslinux-utils
 udev
 usbutils
 uuid-runtime
@@ -83,3 +78,20 @@ firmware-zd1211
 
 libpam-systemd
 systemd-container
+
+PACKAGES install I386
+grub-pc
+grub-efi-amd64-bin
+grub-efi-ia32-bin
+syslinux syslinux-common syslinux-utils
+grml2usb
+
+PACKAGES install AMD64
+grub-pc
+grub-efi-amd64-bin
+grub-efi-ia32-bin
+syslinux syslinux-common syslinux-utils
+grml2usb
+
+PACKAGES install ARM64
+grub-efi-arm64-bin

etc/grml/fai/config/package_config/GRML_FULL

@@ -3,7 +3,6 @@ PACKAGES install
 grml-live
 grml-paste
 grml-quickconfig-standard
-grml-terminalserver
 
 # base os
 apt
@@ -41,17 +40,13 @@ brltty
 espeak-ng
 espeakup
 
-# broken userland debugging
-ltrace
-
 # deploy on remote sites
 openvpn
 ppp
 pppoeconf
 
 # disk subsystems support/debugging
 array-info
-cciss-vol-status
 cryptsetup
 disktype
 dmraid
@@ -76,7 +71,6 @@ stenc
 # disk partitioning/boot
 boot-info-script
 gparted
-grub-pc-bin
 kpartx
 mbr
 partclone
@@ -334,8 +328,6 @@ xterm
 # x86 hardware support
 acpi
 acpi-support
-cmospwd
-cpuid
 irqbalance
 lm-sensors
 lshw
@@ -355,19 +347,53 @@ stress
 man-db
 
 PACKAGES install I386
+# kernel related
 linux-image-686
 linux-cpupower
+# disk subsystems support/debugging, I386/AMD64 specific
+cciss-vol-status
+# x86 hardware support
+cmospwd
+cpuid
+# broken userland debugging
+ltrace
+# disk partitioning/boot
+grub-pc-bin
+
+# PXE boot
+grml-terminalserver
 
 # firmware updates
 fwupd-i386-signed
 
 PACKAGES install AMD64
+# kernel related
 linux-image-amd64
 linux-cpupower
+# disk subsystems support/debugging
+cciss-vol-status
+# x86 hardware support
+cmospwd
+cpuid
+# broken userland debugging
+ltrace
+# disk partitioning/boot
+grub-pc-bin
+
+# PXE boot
+grml-terminalserver
 
 # EFI PXE boot support in grml-terminalserver
 grub-efi-amd64-signed
 shim-signed
 
 # firmware updates
 fwupd-amd64-signed
+
+PACKAGES install ARM64
+# kernel related
+linux-image-arm64
+linux-cpupower
+
+# firmware updates
+fwupd-arm64-signed

etc/grml/fai/config/package_config/GRML_SMALL

@@ -113,3 +113,6 @@ linux-image-686
 
 PACKAGES install AMD64
 linux-image-amd64
+
+PACKAGES install ARM64
+linux-image-arm64

etc/grml/fai/config/scripts/GRMLBASE/44-grub

@@ -11,7 +11,14 @@ set -u
 
 $ROOTCMD mkdir -p /boot/grub
 
-$ROOTCMD grub-mkimage -d /usr/lib/grub/i386-pc \
+if ifclass ARM64 ; then
+  echo "Skipping execution of script on ARM64"
+  exit 0
+fi
+
+# generate /boot/grub/core.img
+$ROOTCMD grub-mkimage \
+  -d /usr/lib/grub/i386-pc \
   -p /boot/grub \
   -o /boot/grub/core.img \
   biosdisk iso9660 \

etc/grml/fai/config/scripts/GRMLBASE/45-grub-images

@@ -28,6 +28,19 @@ ARCHS=(i386-pc)
 declare -A ADDITIONAL_MODULES
 ADDITIONAL_MODULES[i386-pc]="biosdisk"
 
+# arm64 doesn't provide /usr/lib/grub/i386-efi, so we don't include
+# i386-pc in $ARCHS (whereas on AMD64 we have both i386-pc + x86_64-efi)
+if ifclass ARM64 ; then
+  if [ -r "${target}"/usr/lib/grub/arm64-efi/moddep.lst ] ; then
+    ARCHS=(arm64-efi)
+    # NOTE: efi_uga (EFI Universal Graphics Adapter) is deprecated + unavailable on arm64
+    ADDITIONAL_MODULES[arm64-efi]="efi_gop"  # no efi_uga available
+  else
+    echo "/usr/lib/grub/arm64-efi/moddep.lst.lst could not be found, skipping."
+    echo "NOTE: grub-efi-arm64-bin not installed?"
+  fi
+fi
+
 if ifclass AMD64 ; then
   if [ -r "${target}"/usr/lib/grub/x86_64-efi/moddep.lst ] ; then
     ARCHS+=(x86_64-efi)
@@ -54,6 +67,7 @@ for arch in "${ARCHS[@]}" ; do
     i386-pc)    filename=/boot/grub/grub.img ;;
     x86_64-efi) filename=/boot/bootx64.efi   ;;
     i386-efi)   filename=/boot/bootia32.efi  ;;
+    arm64-efi)  filename=/boot/bootaa64.efi  ;;
   esac
 
   $ROOTCMD grub-mkimage -O $arch -o "$filename" --prefix=/boot/grub/ --config="$TMP_CONFIG" \

etc/grml/grml-live.conf

@@ -58,7 +58,7 @@
 # Notice: GRMLBASE is recommended in any case unless you *really* know what you
 # are doing; make sure to also use a GRML_* class (for example GRML_SMALL
 # or GRML_FULL) to get an according kernel and also select the
-# architecture (I386 for x86; AMD64 for x86_64)
+# architecture (I386 for x86; AMD64 for x86_64, ARM64 for arm64)
 # CLASSES="GRMLBASE,GRML_FULL,I386"
 
 # HTTP Proxy to use for APT

etc/zsh/completion.d/_grml-live

@@ -36,7 +36,7 @@ _grmllive_classes() { #{{{
         DEBORPHAN FRESHCLAM
         GRMLBASE GRML_FULL GRML_SMALL
         LATEX LATEX_CLEANUP LOCALES NO_ONLINE RELEASE REMOVE_DOCS SOURCES XORG ZFS
-        I386 AMD64
+        I386 AMD64 ARM64
     )
     compset -P '*,'
     already=(${(s<,>)IPREFIX})