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Ciro Santilli
2018-09-10 11:45:09 +01:00
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README.adoc
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@@ -9,31 +9,35 @@
:toclevels: 6
:toc-title:
Run one command, get a QEMU or gem5 Buildroot BusyBox virtual machine built from source with several minimal Linux kernel 4.18 module development example tutorials with <<gdb,GDB>> and <<KGDB>> step debugging and minimal educational hardware device models. "Tested" in x86, ARM, Ubuntu 18.04 host.
Run one command, get a QEMU or gem5 Buildroot BusyBox virtual machine built from source with several minimal Linux kernel 4.18 module development example tutorials with <<gdb,GDB>> and <<KGDB>> step debugging and minimal educational hardware device models. "Tested" in Ubuntu 18.04 host, x86 and ARM guests.
TLDR: <<qemu-buildroot-setup>>
toc::[]
== About
This project is made to help me study, modify and test low level system components by using system simulators.
This project was created to help me understand, modify and test low level system components by using system simulators.
The current focuses are:
System simulators are cool because they are free, make everything highly reproducible, and give full visibility to the system.
The current components we focus the most on are:
* Linux kernel and Linux kernel modules
* full systems emulators, currently <<qemu-buildroot-setup>> and <<gem5-buildroot-setup>>
* full systems emulators, currently <<qemu-buildroot-setup,qemu>> and <<gem5-buildroot-setup,gem5>>
* <<buildroot>>. We use and therefore document, a large part of its feature set.
This setup could also be easily extended to cover:
but this setup could be of great benefit for:
* C standard libraries
* compilers
This provides setups that are:
The design goal is to provide setups that are:
* highly automated: "just works"
* thoroughly documented: you know what "just works" means
* can be fully built from source: to give visibility and allow modifications
* can also use prebuilt binaries: in case you are lazy or unable to build from source
* can also use prebuilt binaries as much as possible: in case you are lazy or unable to build from source
=== Fairy tale
@@ -65,11 +69,11 @@ There are several different possible setups to use this repo.
Each child section of this section describes one of those setups, and the trade-offs of each.
If you don't know which one to go for, start with <<qemu-buildroot-setup>>
If you don't know which one to go for, start with <<qemu-buildroot-setup>>.
The trade-offs are basically a balance between:
* how long and how much disk space does the build and run take
* speed ans size; how long and how much disk space do the build and run take?
* visibility: can you GDB step debug everything and read source code?
* modifiability: can you modify the source code and rebuild a modified version?
* portability: does it work on a Windows host? Could it ever?
@@ -79,9 +83,9 @@ The trade-offs are basically a balance between:
=== QEMU Buildroot setup
This is the best setup if you are on one of the supported systems: Ubuntu 16.04 or Ubuntu 18.04.
This is the best setup if you are on Ubuntu. We tend to test this repo the most on the latest Ubuntu, and on the latest Ubuntu LTS.
Everything will likely also work on other Linux distros if you install the analogous required packages for your distro from link:configure[], but this is not currently well tested. Compatibility patches are welcome. You can also try <<docker>> if you are on other Linux distros.
Everything will likely also work on other Linux distros if you install the analogous required packages for your distro from link:configure[], but this is not currently well tested. Compatibility patches are welcome. You can also try <<docker>> if you are on other Linux distros. Native Windows is unlikely feasible because Buildroot is a huge set of GNU Make scripts + host tools, just use an Ubuntu VM in that case.
Reserve 12Gb of disk and run:
@@ -196,11 +200,6 @@ hello /root/.profile
│(gdb)
....
We tend to support the following Ubuntu host versions at least:
* if the latest release is an LTS, support both the latest LTS and the previous one
* otherwise, support both latest LTS and the latest non-LTS
==== About the QEMU Buildroot setup
link:https://en.wikipedia.org/wiki/Buildroot[Buildroot] is a set of `make` scripts that downloads from source and compiles compatible versions of: