77 lines
2.3 KiB
Nix
77 lines
2.3 KiB
Nix
# This "device" generates images that can be used with the QEMU
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# emulator. The default output is a directory containing separate
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# kernel (uncompressed vmlinux) and initrd (squashfs) images
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{
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system = {
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crossSystem = {
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config = "mips-unknown-linux-musl";
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gcc = {
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abi = "32";
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arch = "mips32"; # maybe mips_24kc-
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};
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};
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};
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description = ''
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QEMU MIPS
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*********
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This target produces an image for
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QEMU, the "generic and open source machine emulator and
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virtualizer".
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MIPS QEMU emulates a "Malta" board, which was an ATX form factor
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evaluation board made by MIPS Technologies, but mostly in Liminix
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we use paravirtualized devices (Virtio) instead of emulating
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hardware.
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Building an image for QEMU results in a :file:`result/` directory
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containing ``run.sh`` ``vmlinux``, and ``rootfs`` files. To invoke
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the emulator, run ``run.sh``.
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The configuration includes two emulated "hardware" ethernet
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devices and the kernel :code:`mac80211_hwsim` module to
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provide an emulated wlan device. To read more about how
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to connect to this network, refer to :ref:`qemu-networking`
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in the Development manual.
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'';
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module = {pkgs, config, lib, lim, ... }: {
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imports = [
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../../modules/arch/mipseb.nix
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../families/qemu.nix
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];
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kernel = {
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config = {
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MIPS_MALTA= "y";
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CPU_MIPS32_R2= "y";
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POWER_RESET = "y";
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POWER_RESET_SYSCON = "y";
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SERIAL_8250= "y";
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SERIAL_8250_CONSOLE= "y";
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};
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};
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hardware =
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# from arch/mips/mti-malta/Platform:load-$(CONFIG_MIPS_MALTA) += 0xffffffff80100000
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let addr = lim.parseInt "0x80100000";
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in {
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loadAddress = addr;
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entryPoint = addr;
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# Unlike the arm qemu targets, we need a static dts when
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# running u-boot-using tests, qemu dumpdtb command doesn't
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# work for this board. I am not at all sure this dts is
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# *correct* but it does at least boot
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dts = lib.mkForce {
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src = "${config.system.outputs.kernel.modulesupport}/arch/mips/boot/dts/mti/malta.dts";
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includes = [
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"${config.system.outputs.kernel.modulesupport}/arch/mips/boot/dts/"
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];
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};
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};
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};
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}
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