diff --git a/sw/device/boot_rom/rom_crt.S b/sw/device/boot_rom/rom_crt.S
index 538712db1..1c8e29d86 100644
--- a/sw/device/boot_rom/rom_crt.S
+++ b/sw/device/boot_rom/rom_crt.S
@@ -81,19 +81,6 @@ _reset_start:
 _start:
   .globl _start
 
-  // Enable entropy complex - this is not the full enable
-  li   a0, TOP_EARLGREY_ENTROPY_SRC_BASE_ADDR
-  li   t0, 0x2
-  sw   t0, ENTROPY_SRC_CONF_REG_OFFSET(a0)
-
-  li   a0, TOP_EARLGREY_CSRNG_BASE_ADDR
-  li   t0, 0xaa
-  sw   t0, CSRNG_CTRL_REG_OFFSET(a0)
-
-  li   a0, TOP_EARLGREY_EDN0_BASE_ADDR
-  li   t0, 0xaa
-  sw   t0, EDN_CTRL_REG_OFFSET(a0)
-
   // Request memory scrambling and init
   li a0, TOP_EARLGREY_SRAM_CTRL_MAIN_REGS_BASE_ADDR
   li a1, (1<<SRAM_CTRL_CTRL_RENEW_SCR_KEY_BIT)|(1<<SRAM_CTRL_CTRL_INIT_BIT)
diff --git a/sw/device/lib/pinmux.c b/sw/device/lib/pinmux.c
index 8861f54ba..8442bb896 100644
--- a/sw/device/lib/pinmux.c
+++ b/sw/device/lib/pinmux.c
@@ -60,24 +60,4 @@ void pinmux_init(void) {
   reg_offset = kTopEarlgreyPinmuxMioOutIoc11 << 2;
   mask = PINMUX_MIO_OUTSEL_0_OUT_0_MASK;
   mmio_region_write32(reg32, reg_offset, reg_value & mask);
-
-  // Configure UART1 RX input to connect to MIO pad IOC8
-  reg32 = mmio_region_from_addr(PINMUX0_BASE_ADDR +
-                                PINMUX_MIO_PERIPH_INSEL_0_REG_OFFSET);
-  reg_value = kTopEarlgreyPinmuxInselIoc8;
-  // We've got one insel configuration field per register. Hence, we have to
-  // convert the enumeration index into a byte address using << 2.
-  reg_offset = kTopEarlgreyPinmuxPeripheralInUart1Rx << 2;
-  mask = PINMUX_MIO_PERIPH_INSEL_0_IN_0_MASK;
-  mmio_region_write32(reg32, reg_offset, reg_value & mask);
-
-  // Configure UART1 TX output to connect to MIO pad IOC9
-  reg32 =
-      mmio_region_from_addr(PINMUX0_BASE_ADDR + PINMUX_MIO_OUTSEL_0_REG_OFFSET);
-  reg_value = kTopEarlgreyPinmuxOutselUart1Tx;
-  // We've got one insel configuration field per register. Hence, we have to
-  // convert the enumeration index into a byte address using << 2.
-  reg_offset = kTopEarlgreyPinmuxMioOutIoc9 << 2;
-  mask = PINMUX_MIO_OUTSEL_0_OUT_0_MASK;
-  mmio_region_write32(reg32, reg_offset, reg_value & mask);
 }
diff --git a/sw/device/sca/aes_serial.c b/sw/device/sca/aes_serial.c
index 50bee15fa..8f5976a83 100644
--- a/sw/device/sca/aes_serial.c
+++ b/sw/device/sca/aes_serial.c
@@ -203,21 +203,13 @@ int main(void) {
   sca_init();
   sca_get_uart(&uart1);
 
-  LOG_INFO("Running AES serial");
-
-  LOG_INFO("Disabling entropy complex and unneeded clocks to reduce noise.");
-  sca_reduce_noise();
-
-  LOG_INFO("Initializing simple serial interface to capture board.");
   simple_serial_init(uart1);
   simple_serial_register_handler('k', aes_serial_set_key);
   simple_serial_register_handler('p', aes_serial_single_encrypt);
   simple_serial_register_handler('b', aes_serial_batch_encrypt);
 
-  LOG_INFO("Initializing AES unit.");
   init_aes();
 
-  LOG_INFO("Starting simple serial packet handling.");
   while (true) {
     simple_serial_process_packet();
   }
diff --git a/sw/device/sca/lib/sca.c b/sw/device/sca/lib/sca.c
index 9e732a812..ca2bd0ab7 100644
--- a/sw/device/sca/lib/sca.c
+++ b/sw/device/sca/lib/sca.c
@@ -50,7 +50,6 @@ enum {
   kRvTimerHart = kTopEarlgreyPlicTargetIbex0,
 };
 
-static dif_uart_t uart0;
 static dif_uart_t uart1;
 static dif_gpio_t gpio;
 static dif_rv_timer_t timer;
@@ -72,16 +71,9 @@ static void sca_init_uart(void) {
       (dif_uart_params_t){
           .base_addr = mmio_region_from_addr(TOP_EARLGREY_UART0_BASE_ADDR),
       },
-      &uart0));
-  IGNORE_RESULT(dif_uart_configure(&uart0, uart_config));
-  base_uart_stdout(&uart0);
-
-  IGNORE_RESULT(dif_uart_init(
-      (dif_uart_params_t){
-          .base_addr = mmio_region_from_addr(TOP_EARLGREY_UART1_BASE_ADDR),
-      },
       &uart1));
   IGNORE_RESULT(dif_uart_configure(&uart1, uart_config));
+  base_uart_stdout(&uart1);
 }
 
 /**
@@ -137,41 +129,16 @@ void sca_init(void) {
 }
 
 void sca_reduce_noise() {
-  // Disable/stopping functionality not yet provided by EDN and CSRNG DIFs.
-  mmio_region_write32(mmio_region_from_addr(TOP_EARLGREY_EDN0_BASE_ADDR),
-                      EDN_CTRL_REG_OFFSET, EDN_CTRL_REG_RESVAL);
-  mmio_region_write32(mmio_region_from_addr(TOP_EARLGREY_EDN1_BASE_ADDR),
-                      EDN_CTRL_REG_OFFSET, EDN_CTRL_REG_RESVAL);
-  mmio_region_write32(mmio_region_from_addr(TOP_EARLGREY_CSRNG_BASE_ADDR),
-                      CSRNG_CTRL_REG_OFFSET, CSRNG_CTRL_REG_RESVAL);
-
-  // Disable entropy source through DIF.
-  const dif_entropy_params_t entropy_params = {
-      .base_addr = mmio_region_from_addr(TOP_EARLGREY_ENTROPY_SRC_BASE_ADDR),
-  };
-  dif_entropy_t entropy;
-  IGNORE_RESULT(dif_entropy_init(entropy_params, &entropy) == kDifEntropyOk);
-  IGNORE_RESULT(dif_entropy_disable(&entropy) == kDifEntropyOk);
-
   // Disable HMAC, KMAC, OTBN and USB clocks through CLKMGR DIF.
   const dif_clkmgr_params_t clkmgr_params = {
       .base_addr = mmio_region_from_addr(TOP_EARLGREY_CLKMGR_AON_BASE_ADDR),
       .last_gateable_clock = CLKMGR_CLK_ENABLES_CLK_USB_PERI_EN_BIT,
-      .last_hintable_clock = CLKMGR_CLK_HINTS_STATUS_CLK_MAIN_OTBN_VAL_BIT};
+      .last_hintable_clock = CLKMGR_CLK_HINTS_CLK_MAIN_HMAC_HINT_BIT};
   dif_clkmgr_t clkmgr;
   IGNORE_RESULT(dif_clkmgr_init(clkmgr_params, &clkmgr) == kDifClkmgrOk);
   IGNORE_RESULT(dif_clkmgr_hintable_clock_set_hint(
                     &clkmgr, CLKMGR_CLK_HINTS_CLK_MAIN_HMAC_HINT_BIT,
                     kDifClkmgrToggleDisabled) == kDifClkmgrOk);
-  IGNORE_RESULT(dif_clkmgr_hintable_clock_set_hint(
-                    &clkmgr, CLKMGR_CLK_HINTS_CLK_MAIN_KMAC_HINT_BIT,
-                    kDifClkmgrToggleDisabled) == kDifClkmgrOk);
-  IGNORE_RESULT(dif_clkmgr_hintable_clock_set_hint(
-                    &clkmgr, CLKMGR_CLK_HINTS_CLK_IO_DIV4_OTBN_HINT_BIT,
-                    kDifClkmgrToggleDisabled) == kDifClkmgrOk);
-  IGNORE_RESULT(dif_clkmgr_hintable_clock_set_hint(
-                    &clkmgr, CLKMGR_CLK_HINTS_CLK_MAIN_OTBN_HINT_BIT,
-                    kDifClkmgrToggleDisabled) == kDifClkmgrOk);
   IGNORE_RESULT(dif_clkmgr_gateable_clock_set_enabled(
                     &clkmgr, CLKMGR_CLK_ENABLES_CLK_USB_PERI_EN_BIT,
                     kDifClkmgrToggleDisabled) == kDifClkmgrOk);
diff --git a/sw/device/tests/dif/dif_aes_smoketest.c b/sw/device/tests/dif/dif_aes_smoketest.c
index 70c3baaf9..5d69301e2 100644
--- a/sw/device/tests/dif/dif_aes_smoketest.c
+++ b/sw/device/tests/dif/dif_aes_smoketest.c
@@ -7,7 +7,6 @@
 #include "sw/device/lib/dif/dif_aes.h"
 #include "sw/device/lib/runtime/log.h"
 #include "sw/device/lib/testing/check.h"
-#include "sw/device/lib/testing/entropy_testutils.h"
 #include "sw/device/lib/testing/test_main.h"
 
 #include "hw/top_earlgrey/sw/autogen/top_earlgrey.h"
@@ -67,9 +66,6 @@ bool test_main(void) {
 
   LOG_INFO("Running AES test");
 
-  // First of all, we need to get the entropy complex up and running.
-  entropy_testutils_boot_mode_init();
-
   // Initialise AES.
   dif_aes_params_t params = {
       .base_addr = mmio_region_from_addr(TOP_EARLGREY_AES_BASE_ADDR),
diff --git a/sw/device/tests/dif/meson.build b/sw/device/tests/dif/meson.build
index 7ff797bcb..b9e53a744 100644
--- a/sw/device/tests/dif/meson.build
+++ b/sw/device/tests/dif/meson.build
@@ -217,7 +217,6 @@ dif_aes_smoketest_lib = declare_dependency(
       sw_lib_dif_aes,
       sw_lib_mmio,
       sw_lib_runtime_log,
-      sw_lib_testing_entropy_testutils_lib,
       sw_lib_testing_test_status,
     ],
   ),