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xephyr: consider, but give up for now

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Ciro Santilli 六四事件 法轮功
2019-10-18 00:00:00 +00:00
parent 2c9c188b5e
commit 12d9870d52
1 changed files with 41 additions and 30 deletions
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@@ -4939,6 +4939,8 @@ Alternatively, you could also mount your own with:
mkdir /mnt/my9p
mount -t 9p -o trans=virtio,version=9p2000.L host0 /mnt/my9p
....
+
where mount tag `host0` is set by the emulator (`mount_tag` flag on QEMU CLI), and can be found in the guest with: `cat /sys/bus/virtio/drivers/9pnet_virtio/virtio0/mount_tag` as documented at: https://www.kernel.org/doc/Documentation/filesystems/9p.txt[].
* Launch QEMU with `-virtfs` as in your link:run[] script
+
When we tried:
@@ -4961,6 +4963,13 @@ TODO seems possible! Lets do it:
* http://gem5.org/wiki/images/b/b8/Summit2017_wa_devlib.pdf
* http://gem5.org/WA-gem5
From the source, there is just one exported tag named `gem5`, so we could try on the guest:
....
mkdir -p /mnt/9p/gem5
mount -t 9p -o trans=virtio,version=9p2000.L gem5 /mnt/9p/data
....
==== NFS
TODO: get working.
@@ -9061,36 +9070,6 @@ U-Boot is a popular bootloader.
It can read disk filesystems, and Buildroot supports it, so we could in theory put it into memory, and let it find a kernel image from the root filesystem and boot that, but I didn't manage to get it working yet: https://stackoverflow.com/questions/58028789/how-to-boot-linux-aarch64-with-u-boot-with-buildroot-on-qemu
== Xephyr
TODO get a hello world working, and then consider further integration in this repo, e.g. being able to run all C userland content on it.
Xephyr RTOS that has <<posix>> support. I think it works much like our <<baremetal-setup>> which uses Newlib and generates individual ELF files that contain both our C program's code, and the Xephyr libraries.
However, unlike Newlib, Xephyr must be setting up a simple pre-main runtime to be able to handle threads.
Failed attempt:
....
# https://askubuntu.com/questions/952429/is-there-a-good-ppa-for-cmake-backports
wget -O - https://apt.kitware.com/keys/kitware-archive-latest.asc 2>/dev/null | sudo apt-key add -
sudo apt-add-repository 'deb https://apt.kitware.com/ubuntu/ bionic-rc main'
sudo apt-get update
sudo apt-get install cmake
git clone https://github.com/zephyrproject-rtos/zephyr
pip3 install --user -U west packaging
cd zephyr
git checkout v1.14.1
west init zephyrproject
west update
export ZEPHYR_TOOLCHAIN_VARIANT=xtools
export XTOOLS_TOOLCHAIN_PATH="$(pwd)/out/crosstool-ng/build/default/install/aarch64/bin/"
source zephyr-env.sh
west build -b qemu_aarch64 samples/hello_world
....
The build system of that project is a bit excessive / wonky. You need an edge CMake not present in Ubuntu 18.04, which I don't want to install right now, and it uses the weird custom `west` build tool frontend.
== QEMU
=== Introduction to QEMU
@@ -18111,6 +18090,38 @@ gem5:
** https://stackoverflow.com/questions/47997565/gem5-system-requirements-for-decent-performance/48941793#48941793
** https://github.com/gem5/gem5/issues/25
== Xephyr
Xephyr is an RTOS that has <<posix>> support. I think it works much like our <<baremetal-setup>> which uses Newlib and generates individual ELF files that contain both our C program's code, and the Xephyr libraries.
TODO get a hello world working, and then consider further integration in this repo, e.g. being able to run all C userland content on it.
TODO: Cortex-A CPUs are not currently supported, there are some `qemu_cortex_m0` boards, but can't find a QEMU Cortex-A. There is an x86_64 qemu board, but we don't currently have an <<about-the-baremetal-setup,x86 baremetal toolchain>>. For this reason, we won't touch this further for now.
However, unlike Newlib, Xephyr must be setting up a simple pre-main runtime to be able to handle threads.
Failed attempt:
....
# https://askubuntu.com/questions/952429/is-there-a-good-ppa-for-cmake-backports
wget -O - https://apt.kitware.com/keys/kitware-archive-latest.asc 2>/dev/null | sudo apt-key add -
sudo apt-add-repository 'deb https://apt.kitware.com/ubuntu/ bionic-rc main'
sudo apt-get update
sudo apt-get install cmake
git clone https://github.com/zephyrproject-rtos/zephyr
pip3 install --user -U west packaging
cd zephyr
git checkout v1.14.1
west init zephyrproject
west update
export ZEPHYR_TOOLCHAIN_VARIANT=xtools
export XTOOLS_TOOLCHAIN_PATH="$(pwd)/out/crosstool-ng/build/default/install/aarch64/bin/"
source zephyr-env.sh
west build -b qemu_aarch64 samples/hello_world
....
The build system of that project is a bit excessive / wonky. You need an edge CMake not present in Ubuntu 18.04, which I don't want to install right now, and it uses the weird custom `west` build tool frontend.
== About this repo
=== Supported hosts