diff --git a/.gitmodules b/.gitmodules
index 9ea6c32..dfe0145 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -13,3 +13,9 @@
 [submodule "hw/super6502_fpga/src/sim/sub/verilog-sd-emulator"]
 	path = hw/super6502_fpga/src/sim/sub/verilog-sd-emulator
 	url = ../verilog-sd-emulator.git
+[submodule "hw/super6502_fpga/src/sub/wb2axip"]
+	path = hw/super6502_fpga/src/sub/wb2axip
+	url = ../wb2axip.git
+[submodule "hw/super6502_fpga/src/sub/sdcard_mass_storage_controller"]
+	path = hw/super6502_fpga/src/sub/sdcard_mass_storage_controller
+	url = ../sdcard_mass_storage_controller.git
diff --git a/hw/super6502_fpga/src/sub/sdcard_mass_storage_controller b/hw/super6502_fpga/src/sub/sdcard_mass_storage_controller
new file mode 160000
index 0000000..d0203e8
--- /dev/null
+++ b/hw/super6502_fpga/src/sub/sdcard_mass_storage_controller
@@ -0,0 +1 @@
+Subproject commit d0203e8d67906a0ee79a0b67c234ce1adfe30414
diff --git a/hw/super6502_fpga/src/sub/wb2axip b/hw/super6502_fpga/src/sub/wb2axip
new file mode 160000
index 0000000..bf09db6
--- /dev/null
+++ b/hw/super6502_fpga/src/sub/wb2axip
@@ -0,0 +1 @@
+Subproject commit bf09db69cbeba4f8b52edeb6bd6dfe824bb741da