diff --git a/Cargo.toml b/Cargo.toml
deleted file mode 100644
index 795463904797..000000000000
--- a/Cargo.toml
+++ /dev/null
@@ -1,3 +0,0 @@
-[workspace]
-members = ["atsamd-hal-macros", "hal", "boards/*"]
-resolver = "2"
diff --git a/boards/edgebadge/Cargo.toml b/boards/edgebadge/Cargo.toml
index 44e3361e5ab9..6efbabbd03af 100644
--- a/boards/edgebadge/Cargo.toml
+++ b/boards/edgebadge/Cargo.toml
@@ -43,7 +43,7 @@ tinybmp = "0.5.0"
 
 [features]
 # ask the HAL to enable atsamd51j support
-default = ["rt", "atsamd-hal/samd51j", "atsamd-hal/samd51", "unproven"]
+default = ["rt", "atsamd-hal/samd51j", "unproven"]
 rt = ["cortex-m-rt", "atsamd-hal/samd51j-rt"]
 unproven = ["atsamd-hal/unproven"]
 usb = ["atsamd-hal/usb", "usb-device"]
diff --git a/boards/feather_m4/Cargo.toml b/boards/feather_m4/Cargo.toml
index dc5aba557377..b8f7fbede7f8 100644
--- a/boards/feather_m4/Cargo.toml
+++ b/boards/feather_m4/Cargo.toml
@@ -43,7 +43,7 @@ heapless = "0.7"
 
 [features]
 # ask the HAL to enable atsamd51j support
-default = ["rt", "atsamd-hal/samd51j", "atsamd-hal/samd51"]
+default = ["rt", "atsamd-hal/samd51j"]
 rt = ["cortex-m-rt", "atsamd-hal/samd51j-rt"]
 unproven = ["atsamd-hal/unproven"]
 usb = ["atsamd-hal/usb", "usb-device"]
diff --git a/boards/grand_central_m4/Cargo.toml b/boards/grand_central_m4/Cargo.toml
index 49feba3ee9fb..83b9ce2f2343 100644
--- a/boards/grand_central_m4/Cargo.toml
+++ b/boards/grand_central_m4/Cargo.toml
@@ -35,7 +35,7 @@ panic-semihosting = "0.5"
 smart-leds = "0.3"
 
 [features]
-default = ["rt", "atsamd-hal/samd51p", "atsamd-hal/samd51", "atsamd-hal/unproven"]
+default = ["rt", "atsamd-hal/samd51p", "atsamd-hal/unproven"]
 rt = ["cortex-m-rt", "atsamd-hal/samd51p-rt"]
 unproven = ["atsamd-hal/unproven"]
 usb = ["atsamd-hal/usb", "usb-device"]
diff --git a/boards/itsybitsy_m4/Cargo.toml b/boards/itsybitsy_m4/Cargo.toml
index 26aef725d53d..1f992894d1c0 100644
--- a/boards/itsybitsy_m4/Cargo.toml
+++ b/boards/itsybitsy_m4/Cargo.toml
@@ -38,7 +38,7 @@ panic-semihosting = "0.6"
 
 [features]
 # ask the HAL to enable atsamd51g support
-default = ["rt", "atsamd-hal/samd51g", "atsamd-hal/samd51", "atsamd-hal/unproven"]
+default = ["rt", "atsamd-hal/samd51g", "atsamd-hal/unproven"]
 rt = ["cortex-m-rt", "atsamd-hal/samd51g-rt"]
 unproven = ["atsamd-hal/unproven"]
 usb = ["atsamd-hal/usb", "usb-device"]
diff --git a/boards/matrix_portal_m4/Cargo.toml b/boards/matrix_portal_m4/Cargo.toml
index 02761339462b..b31b6eb1bc5e 100644
--- a/boards/matrix_portal_m4/Cargo.toml
+++ b/boards/matrix_portal_m4/Cargo.toml
@@ -35,7 +35,7 @@ panic-halt = "0.2"
 
 [features]
 # ask the HAL to enable atsamd51j support
-default = ["rt", "atsamd-hal/samd51j", "atsamd-hal/samd51"]
+default = ["rt", "atsamd-hal/samd51j"]
 rt = ["cortex-m-rt", "atsamd-hal/samd51j-rt"]
 unproven = ["atsamd-hal/unproven"]
 usb = ["atsamd-hal/usb", "usb-device"]
diff --git a/boards/metro_m4/Cargo.toml b/boards/metro_m4/Cargo.toml
index d58ad28efb69..2722c9a728b9 100644
--- a/boards/metro_m4/Cargo.toml
+++ b/boards/metro_m4/Cargo.toml
@@ -47,7 +47,7 @@ version = "0.3"
 
 [features]
 # ask the HAL to enable atsamd51j support
-default = ["rt", "atsamd-hal/samd51j", "atsamd-hal/samd51"]
+default = ["rt", "atsamd-hal/samd51j"]
 rt = ["cortex-m-rt", "atsamd-hal/samd51j-rt"]
 unproven = ["atsamd-hal/unproven"]
 usb = ["atsamd-hal/usb", "usb-device"]
diff --git a/boards/pygamer/Cargo.toml b/boards/pygamer/Cargo.toml
index d4b406e46144..684f16b9748c 100644
--- a/boards/pygamer/Cargo.toml
+++ b/boards/pygamer/Cargo.toml
@@ -51,7 +51,7 @@ tinybmp = "0.3.1"
 
 [features]
 # ask the HAL to enable atsamd51j support
-default = ["rt", "atsamd-hal/samd51j", "atsamd-hal/samd51", "unproven"]
+default = ["rt", "atsamd-hal/samd51j", "unproven"]
 rt = ["cortex-m-rt", "atsamd-hal/samd51j-rt"]
 unproven = ["atsamd-hal/unproven"]
 usb = ["atsamd-hal/usb", "usb-device"]
diff --git a/boards/pyportal/Cargo.toml b/boards/pyportal/Cargo.toml
index aa4ba2297748..8361b948ef2c 100644
--- a/boards/pyportal/Cargo.toml
+++ b/boards/pyportal/Cargo.toml
@@ -47,7 +47,7 @@ version = "~0.3"
 
 [features]
 # ask the HAL to enable atsamd51j support
-default = ["rt", "atsamd-hal/samd51j", "atsamd-hal/samd51", "unproven"]
+default = ["rt", "atsamd-hal/samd51j", "unproven"]
 unproven = ["atsamd-hal/unproven"]
 rt = ["cortex-m-rt", "atsamd-hal/samd51j-rt"]
 usb = ["atsamd-hal/usb", "usb-device"]
diff --git a/boards/trellis_m4/Cargo.toml b/boards/trellis_m4/Cargo.toml
index fb428a437cc6..4555d5ead66a 100644
--- a/boards/trellis_m4/Cargo.toml
+++ b/boards/trellis_m4/Cargo.toml
@@ -43,7 +43,7 @@ version = "0.3"
 
 [features]
 # ask the HAL to enable atsamd51g support
-default = ["rt", "atsamd-hal/samd51g", "atsamd-hal/samd51"]
+default = ["rt", "atsamd-hal/samd51g"]
 rt = ["cortex-m-rt", "atsamd-hal/samd51g-rt"]
 unproven = ["atsamd-hal/unproven"]
 keypad-unproven = ["keypad", "unproven"]