diff --git a/Cargo.toml b/Cargo.toml
index 667a25b..457431d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [workspace]
 members = [
-    "nucleus",
     "machine",
+    "nucleus",
     "bin/chainboot",
     "bin/chainofcommand",
     "tools/ttt"
diff --git a/Justfile b/Justfile
index 998e597..7b46362 100644
--- a/Justfile
+++ b/Justfile
@@ -63,8 +63,7 @@ cb-eject:
 
 # Build default hw kernel
 build:
-    cargo make build-device
-    cargo make kernel-binary # Should be only one command to do that, not two!
+    cargo make build
 
 # Run clippy checks
 clippy:
diff --git a/Makefile.toml b/Makefile.toml
index 5e43ace..d31b992 100644
--- a/Makefile.toml
+++ b/Makefile.toml
@@ -8,6 +8,7 @@
 [config]
 min_version = "0.32.0"
 default_to_workspace = true
+skip_core_tasks = true
 
 [env]
 DEFAULT_TARGET = "aarch64-vesper-metta"
@@ -96,28 +97,33 @@ alias = "all"
 dependencies = ["kernel-binary", "chainboot", "chainofcommand", "ttt"]
 
 [tasks.xtool-modules]
+workspace = false
 command = "cargo"
 args = ["modules", "tree"]
 
 # Disable build in the root by default.
 [tasks.build]
-clear = true
+workspace = false
 alias = "empty"
 
 # Run a target build with current platform configuration.
 [tasks.build-target]
+workspace = false
 command = "cargo"
 args = ["build", "@@split(PLATFORM_TARGET, )", "@@split(RUST_STD, )", "--release"]
 
 [tasks.build-device]
+workspace = false
 env = { "TARGET_FEATURES" = "${TARGET_BOARD}" }
 run_task = "build-target"
 
 [tasks.build-qemu]
+workspace = false
 env = { "TARGET_FEATURES" = "${QEMU_FEATURES}" }
 run_task = "build-target"
 
 [tasks.qemu-runner]
+workspace = false
 dependencies = ["build-qemu", "kernel-binary"]
 env = { "TARGET_FEATURES" = "${QEMU_FEATURES}" }
 script = [
@@ -128,6 +134,7 @@ script = [
 ]
 
 [tasks.xtool-expand-target]
+workspace = false
 env = { "TARGET_FEATURES" = "" }
 command = "cargo"
 args = ["expand", "@@split(PLATFORM_TARGET, )", "--release"]
@@ -143,6 +150,7 @@ command = "cargo"
 args = ["doc", "--open", "--no-deps", "@@split(PLATFORM_TARGET, )"]
 
 [tasks.xtool-clippy]
+workspace = false
 env = { "TARGET_FEATURES" = "rpi3", "CLIPPY_FEATURES" = { value = "--features=${CLIPPY_FEATURES}", condition = { env_set = ["CLIPPY_FEATURES"] } } }
 command = "cargo"
 args = ["clippy", "@@split(PLATFORM_TARGET, )", "@@split(RUST_STD, )", "@@remove-empty(CLIPPY_FEATURES)", "--", "--deny", "warnings", "--allow", "deprecated"]
@@ -151,6 +159,7 @@ args = ["clippy", "@@split(PLATFORM_TARGET, )", "@@split(RUST_STD, )", "@@remove
 
 ## Copy and prepare a given ELF file. Convert to binary output format.
 [tasks.build-custom-binary]
+workspace = false
 env = { "BINARY_FILE" = "${BINARY_FILE}" }
 script_runner = "@duckscript"
 script = [
@@ -171,11 +180,13 @@ install_crate = { crate_name = "cargo-binutils", binary = "rust-objcopy", test_a
 
 ## Copy and prepare binary with tests.
 [tasks.test-binary]
+workspace = false
 env = { "BINARY_FILE" = "${CARGO_MAKE_TASK_ARGS}" }
 run_task = "custom-binary"
 
 ## Run binary with tests in QEMU.
 [tasks.test-runner]
+workspace = false
 dependencies = ["test-binary"]
 script_runner = "@duckscript"
 script = [
@@ -188,6 +199,7 @@ script = [
 
 ## Generate GDB startup configuration file.
 [tasks.gdb-config]
+workspace = false
 script_runner = "@duckscript"
 script = [
 '''
@@ -202,6 +214,7 @@ script = [
 
 ## Generate zellij configuration file.
 [tasks.zellij-config]
+workspace = false
 dependencies = ["build-qemu", "kernel-binary"]
 script_runner = "@duckscript"
 env = { "ZELLIJ_CONFIG_FILE" = "${CARGO_MAKE_WORKSPACE_WORKING_DIRECTORY}/emulation/zellij-config.sh" }
@@ -218,11 +231,13 @@ script = [
 install_crate = { crate_name = "zellij", binary = "zellij", test_arg = ["--help"] }
 
 [tasks.openocd]
+workspace = false
 script = [
     "${OPENOCD} -f interface/jlink.cfg -f ../ocd/${TARGET_BOARD}_target.cfg"
 ]
 
 [tasks.sdeject]
+workspace = false
 dependencies = ["sdcard"]
 script = [
     "diskutil ejectAll ${VOLUME}"
@@ -233,74 +248,72 @@ alias = "empty"
 
 #
 # Per-workspace commands, disabled in the root by efault.
+# TODO: defined only in sub-modules with workspace = false
 #
 # Tasks for nucleus
-[tasks.build-kernel-binary]
-alias = "empty"
-
-[tasks.kernel]
-alias = "empty"
+#[tasks.build-kernel-binary]
+#alias = "empty"
 
 # Tasks for chainboot
 
-[tasks.chainboot]
-alias = "empty"
+#[tasks.chainboot]
+#alias = "empty"
 
 # sdeject
 #[tasks.cb-eject]
 #alias = "empty"
 
 # Tasks for chainofcommand
-[tasks.chainofcommand]
-alias = "empty"
+#[tasks.chainofcommand]
+#alias = "empty"
 
 # Tasks for ttt
-[tasks.ttt]
-alias = "empty"
+#[tasks.ttt]
+#alias = "empty"
 
 # Other tasks
-[tasks.gdb]
-alias = "empty"
+#[tasks.gdb]
+#alias = "empty"
 
-[tasks.gdb-cb]
-alias = "empty"
+#[tasks.gdb-cb]
+#alias = "empty"
 
-[tasks.sdcard]
-alias = "empty"
+#[tasks.sdcard]
+#alias = "empty"
 
-[tasks.qemu-gdb]
-alias = "empty"
+#[tasks.qemu-gdb]
+#alias = "empty"
 
-[tasks.qemu-cb]
-alias = "empty"
+#[tasks.qemu-cb]
+#alias = "empty"
 
-[tasks.qemu-cb-gdb]
-alias = "empty"
+#[tasks.qemu-cb-gdb]
+#alias = "empty"
 
-[tasks.xtool-hopper]
-alias = "empty"
+#[tasks.xtool-hopper]
+#alias = "empty"
+#
+#[tasks.xtool-nm]
+#alias = "empty"
 
-[tasks.xtool-nm]
-alias = "empty"
+#[tasks.zellij-cb]
+#alias = "empty"
 
-[tasks.zellij-cb]
-alias = "empty"
+#[tasks.zellij-cb-gdb]
+#alias = "empty"
 
-[tasks.zellij-cb-gdb]
-alias = "empty"
-
-[tasks.zellij-nucleus]
-alias = "empty"
+#[tasks.zellij-nucleus]
+#alias = "empty"
 
 ## Target dependencies:
-[tasks.kernel-binary]
-alias = "empty"
+#[tasks.kernel-binary]
+#alias = "empty"
 
-[tasks.chainboot-binary]
-alias = "empty"
+#[tasks.chainboot-binary]
+#alias = "empty"
+#
+#[tasks.chainofcommand-binary]
+#alias = "empty"
 
-[tasks.chainofcommand-binary]
-alias = "empty"
-
-[tasks.ttt-binary]
-alias = "empty"
+#[tasks.ttt-binary]
+#alias = "empty"
diff --git a/bin/chainboot/Makefile.toml b/bin/chainboot/Makefile.toml
index 3cb44b8..c17ab57 100644
--- a/bin/chainboot/Makefile.toml
+++ b/bin/chainboot/Makefile.toml
@@ -8,33 +8,41 @@
 [env]
 CHAINBOOT_ELF = "${CARGO_MAKE_WORKSPACE_WORKING_DIRECTORY}/target/${TARGET}/release/chainboot"
 CHAINBOOT_BIN = "${CARGO_MAKE_WORKSPACE_WORKING_DIRECTORY}/target/chainboot.bin"
+CARGO_MAKE_EXTEND_WORKSPACE_MAKEFILE = true
 
 [tasks.chainboot]
+workspace = false
 dependencies = ["build-device", "build-kernel-binary"]
 command = "echo"
 args = ["\n***===***\n", "🏎️ Run the following command in your terminal:\n", "🏎️   ${CARGO_MAKE_WORKSPACE_WORKING_DIRECTORY}/target/debug/chainofcommand ${CHAINBOOT_SERIAL} ${CHAINBOOT_BAUD} --kernel ${KERNEL_BIN}\n", "***===***\n\n"]
 
 [tasks.build-kernel-binary]
+workspace = false
 env = { "BINARY_FILE" = "${CHAINBOOT_ELF}" }
 run_task = "build-custom-binary"
 
 [tasks.zellij-cb]
+workspace = false
 env = { "KERNEL_BIN" = "${CHAINBOOT_BIN}", "QEMU_OPTS" = "${QEMU_OPTS} ${QEMU_DISASM_OPTS}" }
 run_task = "zellij-config"
 
 [tasks.zellij-cb-gdb]
+workspace = false
 env = { "KERNEL_BIN" = "${CHAINBOOT_BIN}", "QEMU_OPTS" = "${QEMU_OPTS} ${QEMU_DISASM_OPTS} ${QEMU_GDB_OPTS}", "TARGET_BOARD" = "rpi3", "TARGET_DTB" = "${CARGO_MAKE_WORKSPACE_WORKING_DIRECTORY}/targets/bcm2710-rpi-3-b-plus.dtb" }
 run_task = "zellij-config"
 
 [tasks.qemu-cb]
+workspace = false
 env = { "QEMU_RUNNER_OPTS" = "${QEMU_DISASM_OPTS} -serial pty", "KERNEL_BIN" = "${CHAINBOOT_BIN}", "TARGET_DTB" = "${CARGO_MAKE_WORKSPACE_WORKING_DIRECTORY}/targets/bcm2710-rpi-3-b-plus.dtb" }
 extend = "qemu-runner"
 
 [tasks.qemu-cb-gdb]
+workspace = false
 env = { "QEMU_RUNNER_OPTS" = "${QEMU_DISASM_OPTS} ${QEMU_GDB_OPTS} -serial pty", "KERNEL_BIN" = "${CHAINBOOT_BIN}", "TARGET_DTB" = "${CARGO_MAKE_WORKSPACE_WORKING_DIRECTORY}/targets/bcm2710-rpi-3-b-plus.dtb" }
 extend = "qemu-runner"
 
 [tasks.gdb-cb]
+workspace = false
 dependencies = ["build", "build-kernel-binary", "gdb-config"]
 env = { "RUST_GDB" = "${GDB}" }
 script = [
@@ -42,10 +50,10 @@ script = [
 ]
 
 [tasks.sdcard]
-clear = true
 alias = "sdcard-cb"
 
 [tasks.sdcard-cb]
+workspace = false
 dependencies = ["build", "build-kernel-binary"]
 script_runner = "@duckscript"
 script = [
diff --git a/bin/chainofcommand/Makefile.toml b/bin/chainofcommand/Makefile.toml
index 1fd2146..f556286 100644
--- a/bin/chainofcommand/Makefile.toml
+++ b/bin/chainofcommand/Makefile.toml
@@ -5,25 +5,28 @@
 #
 # Build chainofcommand tool
 #
+[env]
+CARGO_MAKE_EXTEND_WORKSPACE_MAKEFILE = true
+
 [tasks.build]
-clear = true
 alias = "build-coc"
 
 [tasks.build-device]
-clear = true
 alias = "empty"
 
 [tasks.build-coc]
+workspace = false
 command = "cargo"
 args = ["build"]
 
 [tasks.chainofcommand]
+workspace = false
 alias = "build-coc"
 
 [tasks.test]
 command = "cargo"
 args = ["test"]
 
-[tasks.xtool-clippy]
+[tasks.xtool-clippy] # todo this should be modules-specific? or just "clippy" for workspace cmd
 command = "cargo"
 args = ["clippy", "--", "-D", "warnings"]
diff --git a/machine/Makefile.toml b/machine/Makefile.toml
index 785d03d..7487b4b 100644
--- a/machine/Makefile.toml
+++ b/machine/Makefile.toml
@@ -3,6 +3,9 @@
 #
 # Copyright (c) Berkus Decker <berkus+vesper@metta.systems>
 #
-# Build nucleus library
+# Build nucleus library (machine)
 #
+[env]
+CARGO_MAKE_EXTEND_WORKSPACE_MAKEFILE = true
+
 # No special configuration needed.
diff --git a/machine/src/lib.rs b/machine/src/lib.rs
index c4b99ff..194ac51 100644
--- a/machine/src/lib.rs
+++ b/machine/src/lib.rs
@@ -2,6 +2,7 @@
 #![no_main]
 #![allow(stable_features)]
 #![allow(incomplete_features)]
+#![allow(internal_features)]
 #![feature(asm_const)]
 #![feature(const_option)]
 #![feature(core_intrinsics)]
diff --git a/nucleus/Makefile.toml b/nucleus/Makefile.toml
index d4fa6fe..46fdefa 100644
--- a/nucleus/Makefile.toml
+++ b/nucleus/Makefile.toml
@@ -5,16 +5,19 @@
 #
 # Build nucleus
 #
+[env]
+CARGO_MAKE_EXTEND_WORKSPACE_MAKEFILE = true
+
 [tasks.build-kernel-binary]
+workspace = false
+dependencies = ["build-device"]
 env = { "BINARY_FILE" = "${KERNEL_ELF}" }
 run_task = "build-custom-binary"
 
 [tasks.kernel]
-clear = true
 alias = "build-kernel-binary"
 
 [tasks.build]
-clear = true
 alias = "build-kernel-binary"
 
 [tasks.qemu]
diff --git a/nucleus/src/main.rs b/nucleus/src/main.rs
index 597e5f8..d0c0096 100644
--- a/nucleus/src/main.rs
+++ b/nucleus/src/main.rs
@@ -10,6 +10,7 @@
 #![no_std]
 #![no_main]
 #![allow(stable_features)]
+#![allow(internal_features)]
 #![feature(asm_const)]
 #![feature(lazy_cell)]
 #![feature(decl_macro)]
diff --git a/tools/ttt/Makefile.toml b/tools/ttt/Makefile.toml
index 61a45b1..d32767d 100644
--- a/tools/ttt/Makefile.toml
+++ b/tools/ttt/Makefile.toml
@@ -5,15 +5,22 @@
 #
 # Build ttt tool
 #
+[env]
+CARGO_MAKE_EXTEND_WORKSPACE_MAKEFILE = true
+
 [tasks.build]
-clear = true
-alias = "ttt"
+disabled = true
+alias = "ttt-binary"
+
+[tasks.build-device]
+alias = "ttt-binary"
 
 [tasks.ttt]
-clear = true
+workspace = false
 alias = "ttt-binary"
 
 [tasks.ttt-binary]
+workspace = false
 env = { "TARGET_FEATURES" = "${TARGET_BOARD}" }
 command = "cargo"
 args = ["build", "--features=${TARGET_FEATURES}"]