diff --git a/carfield.mk b/carfield.mk
index 4ec2e825..a150a6ad 100644
--- a/carfield.mk
+++ b/carfield.mk
@@ -23,7 +23,7 @@ CAR_SW_DIR  := $(CAR_ROOT)/sw
 CAR_TGT_DIR := $(CAR_ROOT)/target/
 CAR_XIL_DIR := $(CAR_TGT_DIR)/xilinx
 CAR_SIM_DIR := $(CAR_TGT_DIR)/sim
-SECD_ROOT    ?= $(shell $(BENDER) path opentitan)
+SECD_ROOT ?= $(shell $(BENDER) path opentitan)
 # Questasim
 CAR_VSIM_DIR := $(CAR_TGT_DIR)/sim/vsim
 
@@ -216,7 +216,7 @@ pulpd-sw-build: pulpd-sw-init
 ## for more information.
 car-hw-init: spatzd-hw-init chs-hw-init secd-hw-init
 
-#Build OpenTitan's debug rom with support for coreid=0x4
+#Build OpenTitan's debug rom with support for coreid != 0x0
 secd-hw-init:
 	$(MAKE) -C $(SECD_ROOT)/hw/vendor/pulp_riscv_dbg/debug_rom clean all FLAGS=-DCARFIELD=1
 
diff --git a/hw/carfield.sv b/hw/carfield.sv
index e1920672..ce9094cb 100644
--- a/hw/carfield.sv
+++ b/hw/carfield.sv
@@ -1760,7 +1760,7 @@ if (CarfieldIslandsCfg.secured.enable) begin : gen_secure_subsystem
   assign security_island_isolate_req  = car_regs_reg2hw.security_island_isolate.q &&
                                         !secure_boot_i;
   assign car_regs_hw2reg.security_island_isolate_status.d =
-         master_isolated_rsp[SecurityIslandTlulMstIdx];
+         master_isolated_rsp[SecurityIslandTlulMstIdx] & master_isolated_rsp[SecurityIslandiDMAMstIdx];
   assign car_regs_hw2reg.security_island_isolate_status.de = 1'b1;
 
   typedef logic [Cfg.AddrWidth-1:0]        narrow_axi_addr_t;
@@ -1774,7 +1774,7 @@ if (CarfieldIslandsCfg.secured.enable) begin : gen_secure_subsystem
 
   `ifndef SECD_NETLIST
   secure_subsystem_synth_wrap_astral #(
-    .HartIdOffs            ( 4           ),
+    .HartIdOffs            ( OpnTitHartIdOffs                  ),
     .AxiAddrWidth          ( Cfg.AddrWidth                     ),
     .AxiDataWidth          ( Cfg.AxiDataWidth                  ),
     .AxiUserWidth          ( Cfg.AxiUserWidth                  ),
@@ -1855,8 +1855,8 @@ if (CarfieldIslandsCfg.secured.enable) begin : gen_secure_subsystem
     .async_idma_axi_out_r_data_i  ( axi_mst_ext_r_data  [SecurityIslandiDMAMstIdx] ),
     .async_idma_axi_out_r_wptr_i  ( axi_mst_ext_r_wptr  [SecurityIslandiDMAMstIdx] ),
     .async_idma_axi_out_r_rptr_o  ( axi_mst_ext_r_rptr  [SecurityIslandiDMAMstIdx] ),
-    .axi_isolate_i    ( {'0, security_island_isolate_req                    }         ),
-    .axi_isolated_o   ( { unused, master_isolated_rsp[SecurityIslandTlulMstIdx] } ),
+    .axi_isolate_i    ( security_island_isolate_req                                ),
+    .axi_isolated_o   ( { master_isolated_rsp[SecurityIslandiDMAMstIdx] master_isolated_rsp[SecurityIslandTlulMstIdx] } ),
      // Uart
     .ibex_uart_rx_i   ( uart_ot_rx_i  ),
     .ibex_uart_tx_o   ( uart_ot_tx_o  ),
diff --git a/hw/carfield_pkg.sv b/hw/carfield_pkg.sv
index 8753576a..1419a495 100644
--- a/hw/carfield_pkg.sv
+++ b/hw/carfield_pkg.sv
@@ -41,7 +41,6 @@ typedef struct packed {
   islands_properties_t pulp;
   islands_properties_t secured;
   islands_properties_t mbox;
-  islands_properties_t secured_idma;
 } islands_cfg_t;
 
 // Types are obtained from Cheshire package
@@ -126,8 +125,7 @@ function automatic int unsigned gen_num_axi_master(islands_cfg_t island_cfg);
   if (island_cfg.safed.enable  )      begin ret++; end
   if (island_cfg.spatz.enable  )      begin ret++; end
   if (island_cfg.pulp.enable   )      begin ret++; end
-  if (island_cfg.secured.enable)      begin ret++; end
-  if (island_cfg.secured.enable)      begin ret++; end
+  if (island_cfg.secured.enable)      begin ret+=2; end
   return ret;
 endfunction
 
@@ -139,12 +137,10 @@ function automatic carfield_master_idx_t carfield_gen_axi_master_idx(islands_cfg
   byte_bt j = 0;
   if (island_cfg.safed.enable) begin ret.safed = i; i++;
   end else begin ret.safed = MaxExtAxiMst + j; j++; end
-  if (island_cfg.secured.enable) begin ret.secured = i; i++;
-  end else begin ret.secured = MaxExtAxiMst + j; j++; end
+  if (island_cfg.secured.enable) begin ret.secured = i; ret.secured_idma = i+1; i+=2;
+  end else begin ret.secured = MaxExtAxiMst + j; ret.secured_idma = MaxExtAxiMst + j + 1; j+=2; end
   if (island_cfg.spatz.enable) begin ret.spatz = i; i++;
   end else begin ret.spatz = MaxExtAxiMst + j; j++; end
-  if (island_cfg.secured.enable) begin ret.secured_idma = i; i++;
-  end else begin ret.secured_idma = MaxExtAxiMst + j; j++; end
   if (island_cfg.pulp.enable) begin ret.pulp = i; i++;
   end else begin ret.pulp = MaxExtAxiMst + j; j++; end
   return ret;
@@ -424,8 +420,8 @@ typedef enum byte_bt {
 typedef enum byte_bt {
   SafetyIslandMstIdx       = CarfieldMstIdx.safed,
   SecurityIslandTlulMstIdx = CarfieldMstIdx.secured,
-  FPClusterMstIdx          = CarfieldMstIdx.spatz,
   SecurityIslandiDMAMstIdx = CarfieldMstIdx.secured_idma,
+  FPClusterMstIdx          = CarfieldMstIdx.spatz,
   IntClusterMstIdx         = CarfieldMstIdx.pulp
 } axi_mst_idx_t;