82 lines
2.3 KiB
Nix
82 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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This target produces an image for QEMU, the "generic and open source
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machine emulator and 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 we use
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paravirtualized devices (Virtio) instead of emulating hardware.
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Building an image for QEMU results in a `+result/+` directory containing
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`+run.sh+` `+vmlinux+`, and `+rootfs+` files. To invoke the emulator,
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run `+run.sh+`.
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The configuration includes two emulated "hardware" ethernet devices and
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the kernel `+mac80211_hwsim+` module to provide an emulated wlan device.
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To read more about how to connect to this network, refer to
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`+qemu-networking+` in the Development manual.
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'';
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module =
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{
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config,
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lib,
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lim,
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...
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}:
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{
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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-$(CONFIG_MIPS_MALTA) += 0xffffffff80100000
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let
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addr = lim.parseInt "0x80100000";
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in
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{
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loadAddress = addr;
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entryPoint = addr;
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# Unlike the arm qemu targets, we need a static dts when
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# running u-boot-using tests, qemu dumpdtb command doesn't
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# work for this board. I am not at all sure this dts is
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# *correct* but it does at least boot
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dts = lib.mkForce {
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src = "${config.system.outputs.kernel.modulesupport}/arch/mips/boot/dts/mti/malta.dts";
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includePaths = [
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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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