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musikcube/doc/rpi-buster-chroot.md
casey langen 4f44829cda
Improve cross-compile support (#634) 
* Update minimum CMake version requirement to get rid of warning.
* Include CMake compile commands for easier diagnostics.
* More improvements to arm toolchain selection while cross-compiling third-party dependencies.
* Use x-tools provided cmake toolchains
* Add a script to download and extract deb dependencies for crosscompile.
* Link against libstdc++ statically when cross-compiling to ARM to improve portability.
* Update GeneratePackage.cmake to generate better filenames.
* Ensure symbols are stripped properly when cross-compiling
* Remove old scripts that are no longer required
* Add script to install x-tools
* Add some docs that describe how to setup a crosscompile environment.
* Add docs for building standlone on Linux
* Update CHANGELOG
* Update version hash.
2023-09-07 22:05:43 -07:00

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Forward

Install dependencies

  • sudo apt install qemu-kvm qemu-user-static binfmt-support qemu-user-static qemu-utils kpartx e2fsprogs

Create a new directory

  • mkdir rpi-buster-chroot

Download image

  • wget https://downloads.raspberrypi.org/raspios_oldstable_lite_armhf/images/raspios_oldstable_lite_armhf-2023-05-03/2023-05-03-raspios-buster-armhf-lite.img.xz

Extract image

  • xz -d -v 2023-05-03-raspios-buster-armhf-lite.img.xz

Expand the image

  • qemu-img resize -f raw 2023-05-03-raspios-buster-armhf-lite.img 16G

Expand the partition within the image

  • fdisk 2023-05-03-raspios-buster-armhf-lite.img
  • Command: p [prints the partition table. note partition #2's "Start" value.]
  • Command: d [delete a partition]
  • Command: 2 [delete the Linux partition, which should be #2]
  • Command: n [add new partition]
  • Command: p [primary partition]
  • Command: 2 [partition number]
  • Command: [enter start value from first step]
  • Command: [press enter to accept default value]
  • Command: N [to NOT remove the ext4 signature]
  • Command: w [write table to file]

Create a mount point

  • mkdir os-mount

Mount both disk imagen partitions via loopback

  • sudo kpartx -a -v 2023-05-03-raspios-buster-armhf-lite.img

output, note device names:

add map loop4p1 (253:0): 0 524288 linear 7:4 8192
add map loop4p2 (253:1): 0 33021952 linear 7:4 532480  <== THIS IS OUR ACTUAL OS

Mount the second partition to the filesystem

  • sudo mount /dev/mapper/loop4p2 ./os-mount

Resize the ext filesystem

  • sudo /sbin/resize2fs /dev/mapper/loop4p2

Inject qemu and setup special mount points

  • sudo cp /usr/bin/qemu-arm-static ./os-mount/usr/bin
  • sudo mount -o bind /dev ./os-mount/dev
  • sudo mount -o bind /proc ./os-mount/proc
  • sudo mount -o bind /sys ./os-mount/sys

Magic: register qemu-arm-static as the arm interpreter in the kernel

Must be root, no sudo

  • su
  • echo ':arm:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/bin/qemu-arm-static:' > /proc/sys/fs/binfmt_misc/register
  • exit

Enter the chroot

  • sudo chroot ./os-mount

Shutdown

  • sudo umount ./os-mount/dev
  • sudo umount ./os-mount/proc
  • sudo umount ./os-mount/sys
  • sudo umount ./os-mount
  • sudo kpartx -d -v 2023-05-03-raspios-buster-armhf-lite.img