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Update README.md

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- Add basic board building
- Remove xen as Heads dependency
- change musl-cross in text to musl-cross-make to reflect new building tools reality
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@ -28,11 +28,12 @@ Please refer to [Heads-wiki](https://github.com/osresearch/heads-wiki/blob/maste
Building heads Building heads
=== ===
`make BOARD=board_name` where board_name is the name of the board directory under `./boards` directory.
In order to build reproducible firmware images, Heads builds a specific In order to build reproducible firmware images, Heads builds a specific
version of gcc and uses it to compile the Linux kernel and various tools version of gcc and uses it to compile the Linux kernel and various tools
that go into the initrd. Unfortunately this means the first step is a that go into the initrd. Unfortunately this means the first step is a
little slow since it will clone the `musl-cross` tree and build gcc... little slow since it will clone the `musl-cross-make` tree and build gcc...
Once that is done, the top level `Makefile` will handle most of the Once that is done, the top level `Makefile` will handle most of the
remaining details -- it downloads the various packages, verifies the remaining details -- it downloads the various packages, verifies the
@ -57,7 +58,6 @@ directory and include:
* [lvm2](https://sourceware.org/lvm2/) * [lvm2](https://sourceware.org/lvm2/)
* [gnupg](https://www.gnupg.org/) * [gnupg](https://www.gnupg.org/)
* [Linux kernel](https://kernel.org) * [Linux kernel](https://kernel.org)
* [Xen hypervisor](https://www.xenproject.org/)
We also recommend installing [Qubes OS](https://www.qubes-os.org/), We also recommend installing [Qubes OS](https://www.qubes-os.org/),
although there Heads can `kexec` into any Linux or although there Heads can `kexec` into any Linux or
@ -69,7 +69,7 @@ Notes:
* Building coreboot's cross compilers can take a while. Luckily this is only done once. * Building coreboot's cross compilers can take a while. Luckily this is only done once.
* Builds are finally reproducible! The [reproduciblebuilds tag](https://github.com/osresearch/heads/issues?q=is%3Aopen+is%3Aissue+milestone%3Areproduciblebuilds) tracks any regressions. * Builds are finally reproducible! The [reproduciblebuilds tag](https://github.com/osresearch/heads/issues?q=is%3Aopen+is%3Aissue+milestone%3Areproduciblebuilds) tracks any regressions.
* Currently only tested in QEMU, the Thinkpad x230 and the Chell Chromebook. * Currently only tested in QEMU, the Thinkpad x230, Librem series and the Chell Chromebook.
** Xen and the TPM do not work in QEMU, so it is only for testing the `initrd` image. ** Xen and the TPM do not work in QEMU, so it is only for testing the `initrd` image.
* Building for the Lenovo X220 requires binary blobs to be placed in the blobs/x220/ folder. * Building for the Lenovo X220 requires binary blobs to be placed in the blobs/x220/ folder.
See the readme.md file in that folder See the readme.md file in that folder