diff --git a/exosphere/bootconfig.h b/exosphere/bootconfig.h
index 6ce8cf970..5fda11563 100644
--- a/exosphere/bootconfig.h
+++ b/exosphere/bootconfig.h
@@ -20,5 +20,9 @@ void bootconfig_clear(void);
 bool bootconfig_is_package2_plaintext(void);
 bool bootconfig_is_package2_unsigned(void);
 bool bootconfig_disable_program_verification(void);
+bool bootconfig_is_debug_mode(void);
+
+uint64_t bootconfig_get_memory_arrangement(void);
+uint64_t bootconfig_get_kernel_memory_configuration(void);
 
 #endif
\ No newline at end of file
diff --git a/exosphere/configitem.c b/exosphere/configitem.c
index 8a26f18b3..2e21a4dbf 100644
--- a/exosphere/configitem.c
+++ b/exosphere/configitem.c
@@ -26,14 +26,23 @@ bool configitem_is_recovery_boot(void) {
     return is_recovery_boot != 0;
 }
 
+bool configitem_is_retail(void) {
+    uint64_t is_retail;
+    if (configitem_get(CONFIGITEM_ISRETAIL, &is_retail) != 0) {
+        generic_panic();
+    }
+
+    return is_retail != 0;
+}
+
 uint32_t configitem_get(enum ConfigItem item, uint64_t *p_outvalue) {
     uint32_t result = 0;
     switch (item) {
         case CONFIGITEM_DISABLEPROGRAMVERIFICATION:
             *p_outvalue = (int)(bootconfig_disable_program_verification());
             break;
-        case CONFIGITEM_MEMORYCONFIGURATION:
-            /* TODO: Fuse driver */
+        case CONFIGITEM_DRAMID:
+            *p_outvalue = fuse_get_dram_id();
             break;
         case CONFIGITEM_SECURITYENGINEIRQ:
             /* SE is interrupt #0x2C. */
@@ -44,29 +53,29 @@ uint32_t configitem_get(enum ConfigItem item, uint64_t *p_outvalue) {
             *p_outvalue = PACKAGE2_MAXVER_400_CURRENT - 1;
             break;
         case CONFIGITEM_HARDWARETYPE:
-            /* TODO: Fuse driver */
+            *p_outvalue = fuse_get_hardware_type();
             break;
         case CONFIGITEM_ISRETAIL:
-            /* TODO: Fuse driver */
+            *p_outvalue = fuse_get_retail_type();
             break;
         case CONFIGITEM_ISRECOVERYBOOT:
             /* TODO: This requires reading values passed to crt0 via NX_Bootloader. TBD pending crt0 implementation. */
             *p_outvalue = 0;
             break;
         case CONFIGITEM_DEVICEID:
-            /* TODO: Fuse driver */
+            *p_outvalue = fuse_get_device_id();
             break;
         case CONFIGITEM_BOOTREASON:
             /* TODO: This requires reading values passed to crt0 via NX_Bootloader. TBD pending crt0 implementation. */
             break;
         case CONFIGITEM_MEMORYARRANGE:
-            /* TODO: More BootConfig stuff. */
+            *p_outvalue = bootconfig_get_memory_arrangement();
             break;
         case CONFIGITEM_ISDEBUGMODE:
-            /* TODO: More BootConfig stuff. */
+            *p_outvalue = (int)(bootconfig_is_debug_mode());
             break;
         case CONFIGITEM_KERNELMEMORYCONFIGURATION:
-            /* TODO: More BootConfig stuff. */
+            *p_outvalue = bootconfig_get_kernel_memory_configuration();
             break;
         case CONFIGITEM_BATTERYPROFILE:
             *p_outvalue = g_battery_profile;
diff --git a/exosphere/configitem.h b/exosphere/configitem.h
index 474566760..f176d9bde 100644
--- a/exosphere/configitem.h
+++ b/exosphere/configitem.h
@@ -6,7 +6,7 @@
 
 enum ConfigItem {
     CONFIGITEM_DISABLEPROGRAMVERIFICATION = 1,
-    CONFIGITEM_MEMORYCONFIGURATION = 2,
+    CONFIGITEM_DRAMID = 2,
     CONFIGITEM_SECURITYENGINEIRQ = 3,
     CONFIGITEM_VERSION = 4,
     CONFIGITEM_HARDWARETYPE = 5,
diff --git a/exosphere/fuse.c b/exosphere/fuse.c
index 90142bb92..c034c1460 100644
--- a/exosphere/fuse.c
+++ b/exosphere/fuse.c
@@ -108,6 +108,17 @@ void fuse_hw_sense(void)
     fuse_wait_idle();
 }
 
+/* Disables all fuse programming. */
+void fuse_disable_programming(void) {
+    FUSE_REGS->FUSE_DIS_PGM = 1;
+}
+
+/* Unknown exactly what this does, but it alters the contents read from the fuse cache. */
+void fuse_secondary_private_key_disable(void) {
+    FUSE_REGS->FUSE_PRIVATEKEYDISABLE = 0x10;
+}
+
+
 /* Read the SKU info register from the shadow cache */
 uint32_t fuse_get_sku_info(void)
 {
@@ -140,4 +151,81 @@ uint32_t fuse_get_reserved_odm(uint32_t idx)
         reserved_odm_val = FUSE_CHIP_REGS->FUSE_RESERVED_ODM[idx];
     
     return reserved_odm_val;
+}
+
+/* Derive the Device ID using values in the shadow cache */
+uint64_t fuse_get_device_id(void) {
+    uint64_t device_id = 0;
+    uint64_t y_coord = FUSE_CHIP_REGS->FUSE_Y_COORDINATE & 0x1FF;
+    uint64_t x_coord = FUSE_CHIP_REGS->FUSE_X_COORDINATE & 0x1FF;
+    uint64_t wafer_id = FUSE_CHIP_REGS->FUSE_WAFER_ID & 0x3F;
+    uint32_t lot_code = FUSE_CHIP_REGS->FUSE_LOT_CODE_0;
+    uint64_t fab_code = FUSE_CHIP_REGS->FUSE_FAB_CODE & 0x3F;
+    uint64_t derived_lot_code = 0;
+    for (unsigned int i = 0; i < 5; i++) {
+        derived_lot_code = (derived_lot_code * 0x24) + ((lot_code >> (24 - 6*i)) & 0x3F);
+    }
+    derived_lot_code &= 0x03FFFFFF;
+    
+    device_id |= y_coord << 0;
+    device_id |= x_coord << 9; 
+    device_id |= wafer_id << 18;
+    device_id |= derived_lot_code << 24;
+    device_id |= fab_code << 50;
+    return device_id;
+}
+
+/* Get the DRAM ID using values in the shadow cache */
+uint32_t fuse_get_dram_id(void) {
+    return (FUSE_CHIP_REGS->FUSE_RESERVED_ODM[4] >> 3) & 0x7;
+}
+
+/* Derive the Hardware Type using values in the shadow cache */
+uint32_t fuse_get_hardware_type(void) {
+    uint32_t hardware_type = ((FUSE_CHIP_REGS->FUSE_RESERVED_ODM[4] >> 7) & 2) | ((FUSE_CHIP_REGS->FUSE_RESERVED_ODM[4] >> 2) & 1);
+    if (hardware_type) {
+        if (hardware_type == 1) {
+            return 0;
+        }
+        if (hardware_type == 2) {
+            return 1;
+        }
+    } else if ((FUSE_CHIP_REGS->FUSE_SPARE_BIT[9] & 1) == 0) {
+        return 0;
+    }
+    return 3;
+}
+
+/* Derive the Retail Type using values in the shadow cache */
+uint32_t fuse_get_retail_type(void) {
+    /* Retail type = IS_RETAIL | UNIT_TYPE */
+    uint32_t retail_type = ((FUSE_CHIP_REGS->FUSE_RESERVED_ODM[4] >> 7) & 4) | (FUSE_CHIP_REGS->FUSE_RESERVED_ODM[4] & 3);
+    if (retail_type == 4) { /* Standard retail unit, IS_RETAIL | 0. */
+        return 1;
+    } else if (retail_type == 3) { /* Standard dev unit, 0 | DEV_UNIT. */
+        return 0;
+    } 
+    return 2; /* IS_RETAIL | DEV_UNIT */
+}
+
+/* Derive the 16-byte Hardware Info using values in the shadow cache, and copy to output buffer. */
+void fuse_get_hardware_info(void *dst) {
+    uint32_t hw_info[0x4];
+    
+    uint32_t unk_hw_fuse = FUSE_CHIP_REGS->_0x120 & 0x3F;
+    uint32_t y_coord = FUSE_CHIP_REGS->FUSE_Y_COORDINATE & 0x1FF;
+    uint32_t x_coord = FUSE_CHIP_REGS->FUSE_X_COORDINATE & 0x1FF;
+    uint32_t wafer_id = FUSE_CHIP_REGS->FUSE_WAFER_ID & 0x3F;
+    uint32_t lot_code_0 = FUSE_CHIP_REGS->FUSE_LOT_CODE_0;
+    uint32_t lot_code_1 = FUSE_CHIP_REGS->FUSE_LOT_CODE_1 & 0x0FFFFFFF;
+    uint32_t fab_code = FUSE_CHIP_REGS->FUSE_FAB_CODE & 0x3F;
+    uint32_t vendor_code = FUSE_CHIP_REGS->FUSE_VENDOR_CODE & 0xF;
+    
+    /* Hardware Info = unk_hw_fuse || Y_COORD || X_COORD || WAFER_ID || LOT_CODE || FAB_CODE || VENDOR_ID */
+    hw_info[0] = (uint32_t)((lot_code_1 << 30) | (wafer_id << 24) | (x_coord << 15) | (y_coord << 6) | (unk_hw_fuse));
+    hw_info[1] = (uint32_t)((lot_code_0 << 26) | (lot_code_1 >> 2));
+    hw_info[2] = (uint32_t)((fab_code << 26) | (lot_code_0 >> 6));
+    hw_info[3] = (uint32_t)(vendor_code);
+    
+    memcpy(dst, hw_info, 0x10);
 }
\ No newline at end of file
diff --git a/exosphere/fuse.h b/exosphere/fuse.h
index 20bf38695..9a68725b5 100644
--- a/exosphere/fuse.h
+++ b/exosphere/fuse.h
@@ -176,10 +176,18 @@ void fuse_init(void);
 uint32_t fuse_hw_read(uint32_t addr);
 void fuse_hw_write(uint32_t, value, uint32_t addr);
 void fuse_hw_sense(void);
+void fuse_disable_programming(void);
+void fuse_secondary_private_key_disable(void);
 
 uint32_t fuse_get_sku_info(void);
-uint32_t fuse_get_bootrom_patch_version(void);
 uint32_t fuse_get_spare_bit(uint32_t idx);
 uint32_t fuse_get_reserved_odm(uint32_t idx);
 
+uint32_t fuse_get_bootrom_patch_version(void);
+uint64_t fuse_get_device_id(void);
+uint32_t fuse_get_dram_id(void);
+uint32_t fuse_get_hardware_type(void);
+uint32_t fuse_get_retail_type(void);
+void fuse_get_hardware_info(void *dst);
+
 #endif
diff --git a/exosphere/gcm.c b/exosphere/gcm.c
index 211cd8252..f09ae2d08 100644
--- a/exosphere/gcm.c
+++ b/exosphere/gcm.c
@@ -2,6 +2,7 @@
 #include <string.h>
 
 #include "utils.h"
+#include "fuse.h"
 #include "gcm.h"
 
 #include "sealedkeys.h"
@@ -158,7 +159,9 @@ size_t gcm_decrypt_key(void *dst, size_t dst_size, const void *src, size_t src_s
         return 0;
     }
 
-    /* TODO: Validate Device ID matches in blob data from fuses. */
+    if (read64le(src_bytes, src_size - 0x28) != fuse_get_device_id()) {
+        return 0;
+    }
 
     return src_size - 0x30;
 }
diff --git a/exosphere/smc_user.c b/exosphere/smc_user.c
index b4fb500f5..51cb1ddf8 100644
--- a/exosphere/smc_user.c
+++ b/exosphere/smc_user.c
@@ -203,7 +203,7 @@ uint32_t user_load_aes_key(smc_args_t *args) {
     wrapped_key[0] = args->X[4];
     wrapped_key[1] = args->X[5];
     
-    /* TODO: Unseal the kek. */
+    /* Unseal the kek. */
     unseal_key(KEYSLOT_SWITCH_TEMPKEY, sealed_kek, 0x10, CRYPTOUSECASE_AES);
     
     /* Unwrap the key. */
@@ -301,7 +301,7 @@ uint32_t user_generate_specific_aes_key(smc_args_t *args) {
         keyslot = KEYSLOT_SWITCH_DEVICEKEY;
     }
     
-    if (0 /* TODO: GET_BOOTROM_PATCH_VERSION < 0x7F */) {
+    if (fuse_get_bootrom_patch_version() < 0x7F) {
         /* On dev units, use a fixed "all-zeroes" seed. */
         /* Yes, this data really is all-zero in actual TrustZone .rodata. */
         uint8_t dev_specific_aes_key_source[0x10] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
@@ -384,7 +384,7 @@ uint32_t user_load_rsa_oaep_key(smc_args_t *args) {
     if (is_personalized && size != 0x240) {
         return 2;
     }
-    if (!is_personalized && (size != 0x220 /* TODO: || GET_BOOTROM_PATCH_VERSION >= 0x7F */)) {
+    if (!is_personalized && (size != 0x220 || fuse_get_bootrom_patch_version() >= 0x7F)) {
         return 2;
     }
     
@@ -431,7 +431,7 @@ uint32_t user_decrypt_rsa_private_key(smc_args_t *args) {
     if (is_personalized && size < 0x31) {
         return 2;
     }
-    if (!is_personalized && (size < 0x11 /* TODO: || GET_BOOTROM_PATCH_VERSION >= 0x7F */)) {
+    if (!is_personalized && (size < 0x11 || fuse_get_bootrom_patch_version() >= 0x7F)) {
         return 2;
     }
     
@@ -479,7 +479,7 @@ uint32_t user_load_secure_exp_mod_key(smc_args_t *args) {
     if (is_personalized && size != 0x130) {
         return 2;
     }
-    if (!is_personalized && (size != 0x110 /* TODO: || GET_BOOTROM_PATCH_VERSION >= 0x7F */)) {
+    if (!is_personalized && (size != 0x110 || fuse_get_bootrom_patch_version() >= 0x7F)) {
         return 2;
     }
     
diff --git a/exosphere/utils.h b/exosphere/utils.h
index bb0d6bf77..dae7ce8f3 100644
--- a/exosphere/utils.h
+++ b/exosphere/utils.h
@@ -21,6 +21,10 @@ static inline uint32_t read32be(const unsigned char *dword, size_t offset) {
     return __builtin_bswap32(read32le(dword, offset));
 }
 
+static inline uint64_t read64le(const void *qword, size_t offset) {
+    return *(uint32_t *)((uintptr_t)dword + offset);
+}
+
 static __attribute__((noinline)) bool check_32bit_additive_overflow(uint32_t a, uint32_t b) {
     uint64_t x = (uint64_t)a + (uint64_t)b;
     return x > (uint64_t)(UINT32_MAX);