Set the QFPROM fuses - Qualcomm Dragonwing Documentation

Qualcomm fuse programmable read only memory (QFPROM) fuses store cryptographic keys that authenticate software images during the secure boot process. This ensures that only authorized software can run on the device. QFPROM uses a fusing mechanism to program registers by blowing fuses, thereby storing permanent data This is a one-time operation that can’t be undone. The following table captures the QFPROM fuse values and details for QCS5430, QCS6490, Qualcomm Dragonwing^™ IQ-9075, Qualcomm Dragonwing^™ IQ-9100, Qualcomm Dragonwing^™ IQ-8275, Qualcomm Dragonwing^™ IQ-8300, and Qualcomm Dragonwing^™ IQ-615. Secure boot is enabled when the respective fuses are blown.

QCS5430/QCS6490
IQ-9075/IQ-9100
IQ-8275/IQ-8300
IQ-615

Fuse name	Start address (in hexadecimal)	Bit number	Fuse blow value	Description
Read permissions
Secondary Key derivation Key Read disable	7801A8	24	1	After provisioning the SKDK, blow this bit to secure the secondary key from being read back. A secure path hardware exists from SKDK to the crypto engine.
Write permissions
Read permissions write disable	7801B0	6	1	Blow this bit after the region has been provisioned to disable further QFPROM changes to this region.
FEC enables write disable	7801B0	8	1	Blow this bit after the region has been provisioned to disable further QFPROM changes to this region.
OEM configuration write disable	7801B0	9	1	Blow this bit after the region has been provisioned to disable further QFPROM changes to this region.
Public key hash 0 write disable	7801B0	17	1	Blow this bit after the region has been provisioned to disable further QFPROM changes to this region.
OEM secure boot write disable	7801B0	23	1	Blow this bit after the region has been provisioned to disable further QFPROM changes to this region.
Secondary key derivation key write disable	7801B0	24	1	Blow this bit after the region has been provisioned to disable further QFPROM changes to this region.
FEC enable
OEM secure boot FEC enable	7801B8	23	1	To enable FEC for OEM secure boot region, blow this bit. Ensure that the complete region is provisioned before FEC is enabled.
Secondary key derivation key FEC enable	7801B8	24	1	To enable FEC for the secondary KDF key, blow this bit. Ensure that the complete region is provisioned before FEC is enabled.
OEM Config
`WDOG_EN`	7801C0	14	1	Prevents the `WDOG_DISABLE` GPIO from disabling WDOG, freeing up the GPIO and preventing potential abuse by an attacker.
`SHARED_QSEE_SPIDEN_DISABLE`	7801C0	30	1	A shared Qualcomm TEE secure invasive debug disable bucket. A corresponding Qualcomm fuse can override this OEM‑controlled fuse.
`SHARED_QSEE_SPNIDEN_DISABLE`	7801C0	31	1	A shared Qualcomm TEE secure non-invasive debug disable bucket. A corresponding Qualcomm fuse can override this OEM‑controlled fuse.
`SHARED_MSS_DBGEN_DISABLE`	7801C4	32	1	A shared MSS invasive debug disable bucket. A corresponding Qualcomm fuse can override this OEM‑controlled fuse.
`SHARED_MSS_NIDEN_DISABLE`	7801C4	33	1	A shared MSS non-invasive debug disable bucket. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`SHARED_CP_DBGEN_DISABLE`	7801C4	34	1	A shared CP invasive debug disable bucket. A corresponding Qualcomm fuse can override this OEM‑controlled fuse.
`SHARED_CP_NIDEN_DISABLE`	7801C4	35	1	A shared CP non-invasive debug disable bucket. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`SHARED_NS_DBGEN_DISABLE`	7801C4	36	1	A shared CP non-invasive debug disable bucket. A corresponding Qualcomm fuse can override this OEM‑controlled fuse.
`SHARED_NS_NIDEN_DISABLE`	7801C4	37	1	A shared CP non-invasive debug disable bucket. A corresponding Qualcomm fuse can override this OEM‑controlled fuse.
`APPS_DBGEN_DISABLE`	7801C4	38	1	Blow this bit for a secure solution. This configuration disables the application processor global invasive debug capabilities (JTAG and monitor mode). The `OVERRIDE` registers can override this configuration.
`APPS_NIDEN_DISABLE`	7801C4	39	1	Blow this bit for a secure solution. This configuration disables the application processor global non-invasive debug capabilities (trace and performance monitoring). This configuration can be overridden with the `OVERRIDE` registers.
`SHARED_MISC_DEBUG_DISABLE`	7801C4	40	1	A shared miscellaneous debug disable bucket. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`EKU_ENFORCEMENT_EN`	7801C8	30	1	To enable enforcement of the EKU field in the certificate, blow this device.
`OEM_HW_ID[0:15]`	7801CC	[47:32]	0	Represents the OEM hardware ID. Bits 15:0.
`OEM_PRODUCT_ID[0:15]`	7801CC	[63:48]	0	Represents the OEM product ID. Bits 15:0.
`ANTI_ROLLBACK_FEATURE_EN[0]`	7801D4	32	1

Bit 0 - BOOT_ANTI_ROLLBACK_EN

Bit 1 - TZAPPS_ANTI_ROLLBACK_EN

Bit 2 - PILSUBSYS_ANTI_ROLLBACK_EN

Bit 3 - MSA_ANTI_ROLLBACK_EN

`ANTI_ROLLBACK_FEATURE_EN[1]`	7801D4	33	1
`ANTI_ROLLBACK_FEATURE_EN[2]`	7801D4	34	1
`ANTI_ROLLBACK_FEATURE_EN[3]`	7801D4	35	1
PK hash
`PK hash 0[383:0]`	780248	[383:0]		The OEM-specific root certificate PK hash value.
OEM secure boot
`OEM_SECURE_BOOT1_PK_HASH_IN_FUSE`	780728	4	1	When this bit is ‘1’, use the value stored in OEM_PK_HASH for the root certificate hash.
`OEM_SECURE_BOOT1_AUTH_EN`	780728	5	1	To enable secure boot for apps and other peripheral images, blow this bit. When this bit is ‘1’, it enables authentication for any code that references secure boot configuration 1.
`OEM_SECURE_BOOT2_PK_HASH_IN_FUSE`	780728	12	1	For boot configuration 2: If this bit is ‘0’, use the internal ROM hash index and `OEM_SECURE_BOOT1_ROM_PK_HASH_IDX[3:0]` for the root certificate hash. If this bit is ‘1’, use the value stored in `OEM_PK_HASH` for the root certificate hash.
`OEM_SECURE_BOOT2_AUTH_EN`	780728	13	1	To enable the secure boot, blow this bit. When this bit is ‘1’, it enables authentication for any code that references secure boot.
`OEM_SECURE_BOOT3_PK_HASH_IN_FUSE`	780728	20	1	For boot configuration 3: If this bit is ‘0’, use the internal ROM hash index and `OEM_SECURE_BOOT1_ROM_PK_HASH_IDX[3:0]` for the root certificate hash. When this bit is ‘1’, use the value stored in `OEM_PK_HASH` for the root certificate hash.
`OEM_SECURE_BOOT3_AUTH_EN`	780728	21	1	To enable the secure boot, blow this bit. When this bit is ‘1’, it enables authentication for any code that references secure boot configuration 3.
Sec key derivation key
`Sec Key derivation Key[255:0]`	780738	[255:0]		This 256‑bit value is used as the secondary key derivation input, which is used to generate the secondary key for the crypto engine. When running in an insecure mode (no secure boot or Debug enabled), the SKDK is fed into the key derivation function to generate a unique non‑secure secondary key for use by the crypto engine. When running in a secure mode (secure boot and debug disabled), the SKDK is fed directly to the crypto engine as the secondary key. After the SKDK value has been correctly programmed, the SKDK Read Disable must be blown to permanently protect the SKDK value. The software reads the SKDK value from the QFPROM before this correction is made. The SBL fuse blow API can automatically generate a random number for use as the SKDK, ensuring that the SKDK value is never available outside of the device.

Fuse name	Start address (in hexadecimal)	Bit number	Fuse blow value	Description
Read permissions
Secondary Key derivation Key Read disable	780190	31	1	After provisioning the SKDK, blow this bit to secure the secondary key from being read back. A secure path hardware exists from SKDK to the crypto engine.
Write permissions
Read permissions write disable	780198	5	1	Blow this bit after the region has been provisioned to disable further QFPROM changes to this region.
FEC enables write disable	780198	7	1	Blow this bit after the region has been provisioned to disable further QFPROM changes to this region.
OEM configuration write disable	780198	8	1	Blow this bit after the region has been provisioned to disable further QFPROM changes to this region.
Public key hash 0 write disable	780198	24	1	Blow this bit after the region has been provisioned to disable further QFPROM changes to this region.
OEM secure boot write disable	780198	30	1	Blow this bit after the region has been provisioned to disable further QFPROM changes to this region.
Secondary key derivation key write disable	780198	31	1	Blow this bit after the region has been provisioned to disable further QFPROM changes to this region.
FEC enable
OEM secure boot FEC enable	7801A0	30	1	To enable FEC for OEM secure boot region, blow this bit. Ensure that the complete region is provisioned before FEC is enabled.
Secondary key derivation key FEC enable	7801A0	31	1	To enable FEC for the secondary KDF key, blow this bit. Ensure that the complete region is provisioned before FEC is enabled.
OEM Config
`WDOG_EN`	7801A8	14	1	Prevents the `WDOG_DISABLE` GPIO from disabling WDOG, freeing up the GPIO and preventing potential abuse by an attacker.
`SHARED_QSEE_SPIDEN_DISABLE`	7801A8	30	1	A shared Qualcomm TEE secure invasive debug disable bucket. A corresponding Qualcomm fuse can override this OEM‑controlled fuse.
`SHARED_QSEE_SPNIDEN_DISABLE`	7801A8	31	1	A shared Qualcomm TEE secure non-invasive debug disable bucket. A corresponding Qualcomm fuse can override this OEM‑controlled fuse.
`SHARED_MSS_DBGEN_DISABLE`	7801AC	32	1	A shared MSS invasive debug disable bucket. A corresponding Qualcomm fuse can override this OEM‑controlled fuse.
`SHARED_MSS_NIDEN_DISABLE`	7801AC	33	1	A shared MSS non-invasive debug disable bucket. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`SHARED_CP_DBGEN_DISABLE`	7801AC	34	1	A shared CP invasive debug disable bucket. A corresponding Qualcomm fuse can override this OEM‑controlled fuse.
`SHARED_CP_NIDEN_DISABLE`	7801AC	35	1	A shared CP non-invasive debug disable bucket. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`SHARED_NS_DBGEN_DISABLE`	7801AC	36	1	A shared CP non-invasive debug disable bucket. A corresponding Qualcomm fuse can override this OEM‑controlled fuse.
`SHARED_NS_NIDEN_DISABLE`	7801AC	37	1	A shared CP non-invasive debug disable bucket. A corresponding Qualcomm fuse can override this OEM‑controlled fuse.
`APPS_DBGEN_DISABLE`	7801AC	38	1	Blow this bit for a secure solution. This configuration disables the application processor global invasive debug capabilities (JTAG and monitor mode). The `OVERRIDE` registers can override this configuration.
`APPS_NIDEN_DISABLE`	7801AC	39	1	Blow this bit for a secure solution. This configuration disables the application processor global non-invasive debug capabilities (trace and performance monitoring). This configuration can be overridden with the `OVERRIDE` registers.
`SHARED_MISC_DEBUG_DISABLE`	7801AC	40	1	A shared miscellaneous debug disable bucket. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`EKU_ENFORCEMENT_EN`	7801B0	30	1	To enable enforcement of the EKU field in the certificate, blow this device.
`OEM_HW_ID[0:15]`	7801B4	[47:32]	0	Represents the OEM hardware ID. Bits 15:0.
`OEM_PRODUCT_ID[0:15]`	7801B4	[63:48]	0	Represents the OEM product ID. Bits 15:0.
`ANTI_ROLLBACK_FEATURE_EN[0]`	7801BC	32	1

Bit 0 - BOOT_ANTI_ROLLBACK_EN

Bit 1 - TZAPPS_ANTI_ROLLBACK_EN

Bit 2 - PILSUBSYS_ANTI_ROLLBACK_EN

Bit 3 - MSA_ANTI_ROLLBACK_EN

`ANTI_ROLLBACK_FEATURE_EN[1]`	7801BC	33	1
`ANTI_ROLLBACK_FEATURE_EN[2]`	7801BC	34	1
`ANTI_ROLLBACK_FEATURE_EN[3]`	7801BC	35	1
PK hash
`PK hash 0[383:0]`	7802A0	[383:0]		The OEM-specific root certificate PK hash value.
OEM secure boot
`OEM_SECURE_BOOT1_PK_HASH_IN_FUSE`	780D78	4	1	When this bit is ‘1’, use the value stored in OEM_PK_HASH for the root certificate hash.
`OEM_SECURE_BOOT1_AUTH_EN`	780D78	5	1	To enable secure boot for apps and other peripheral images, blow this bit. When this bit is ‘1’, it enables authentication for any code that references secure boot configuration 1.
`OEM_SECURE_BOOT2_PK_HASH_IN_FUSE`	780D78	12	1	For boot configuration 2: If this bit is ‘0’, use the internal ROM hash index and `OEM_SECURE_BOOT1_ROM_PK_HASH_IDX[3:0]` for the root certificate hash. If this bit is ‘1’, use the value stored in `OEM_PK_HASH` for the root certificate hash.
`OEM_SECURE_BOOT2_AUTH_EN`	780D78	13	1	To enable the secure boot, blow this bit. When this bit is ‘1’, it enables authentication for any code that references secure boot.
`OEM_SECURE_BOOT3_PK_HASH_IN_FUSE`	780D78	20	1	For boot configuration 3: If this bit is ‘0’, use the internal ROM hash index and `OEM_SECURE_BOOT1_ROM_PK_HASH_IDX[3:0]` for the root certificate hash. When this bit is ‘1’, use the value stored in `OEM_PK_HASH` for the root certificate hash.
`OEM_SECURE_BOOT3_AUTH_EN`	780D78	21	1	To enable the secure boot, blow this bit. When this bit is ‘1’, it enables authentication for any code that references secure boot configuration 3.
Sec key derivation key
`Sec Key derivation Key[255:0]`	780D88	[255:0]		This 256‑bit value is used as the secondary key derivation input, which is used to generate the secondary key for the crypto engine. When running in an insecure mode (no secure boot or Debug enabled), the SKDK is fed into the key derivation function to generate a unique non‑secure secondary key for use by the crypto engine. When running in a secure mode (secure boot and debug disabled), the SKDK is fed directly to the crypto engine as the secondary key. After the SKDK value has been correctly programmed, the SKDK Read Disable must be blown to permanently protect the SKDK value. The software reads the SKDK value from the QFPROM before this correction is made. The SBL fuse blow API can automatically generate a random number for use as the SKDK, ensuring that the SKDK value is never available outside of the device.

Fuse name	Start address (in hexadecimal)	Bit number	Fuse blow value	Description
Read permissions
Secondary Key derivation Key Read disable	780190	31	1	After provisioning the SKDK, blow this bit to secure the secondary key from being read back. A secure path hardware exists from SKDK to the crypto engine.
Write permissions
Read permissions write disable	780198	5	1	Blow this bit after the region has been provisioned to disable further QFPROM changes to this region.
FEC enables write disable	780198	7	1	Blow this bit after the region has been provisioned to disable further QFPROM changes to this region.
OEM configuration write disable	780198	8	1	Blow this bit after the region has been provisioned to disable further QFPROM changes to this region.
Public key hash 0 write disable	780198	24	1	Blow this bit after the region has been provisioned to disable further QFPROM changes to this region.
OEM secure boot write disable	780198	30	1	Blow this bit after the region has been provisioned to disable further QFPROM changes to this region.
Secondary key derivation key write disable	780198	31	1	Blow this bit after the region has been provisioned to disable further QFPROM changes to this region.
FEC enable
OEM secure boot FEC enable	7801A0	30	1	To enable FEC for OEM secure boot region, blow this bit. Ensure that the complete region is provisioned before FEC is enabled.
Secondary key derivation key FEC enable	7801A0	31	1	To enable FEC for the secondary KDF key, blow this bit. Ensure that the complete region is provisioned before FEC is enabled.
OEM Config
`WDOG_EN`	7801A8	14	1	Prevents the `WDOG_DISABLE` GPIO from disabling WDOG, freeing up the GPIO and preventing potential abuse by an attacker.
`SHARED_QSEE_SPIDEN_DISABLE`	7801A8	30	1	A shared Qualcomm TEE secure invasive debug disable bucket. A corresponding Qualcomm fuse can override this OEM‑controlled fuse.
`SHARED_QSEE_SPNIDEN_DISABLE`	7801A8	31	1	A shared Qualcomm TEE secure non-invasive debug disable bucket. A corresponding Qualcomm fuse can override this OEM‑controlled fuse.
`SHARED_MSS_DBGEN_DISABLE`	7801AC	32	1	A shared MSS invasive debug disable bucket. A corresponding Qualcomm fuse can override this OEM‑controlled fuse.
`SHARED_MSS_NIDEN_DISABLE`	7801AC	33	1	A shared MSS non-invasive debug disable bucket. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`SHARED_CP_DBGEN_DISABLE`	7801AC	34	1	A shared CP invasive debug disable bucket. A corresponding Qualcomm fuse can override this OEM‑controlled fuse.
`SHARED_CP_NIDEN_DISABLE`	7801AC	35	1	A shared CP non-invasive debug disable bucket. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`SHARED_NS_DBGEN_DISABLE`	7801AC	36	1	A shared CP non-invasive debug disable bucket. A corresponding Qualcomm fuse can override this OEM‑controlled fuse.
`SHARED_NS_NIDEN_DISABLE`	7801AC	37	1	A shared CP non-invasive debug disable bucket. A corresponding Qualcomm fuse can override this OEM‑controlled fuse.
`APPS_DBGEN_DISABLE`	7801AC	38	1	Blow this bit for a secure solution. This configuration disables the application processor global invasive debug capabilities (JTAG and monitor mode). The `OVERRIDE` registers can override this configuration.
`APPS_NIDEN_DISABLE`	7801AC	39	1	Blow this bit for a secure solution. This configuration disables the application processor global non-invasive debug capabilities (trace and performance monitoring). This configuration can be overridden with the `OVERRIDE` registers.
`SHARED_MISC_DEBUG_DISABLE`	7801AC	40	1	A shared miscellaneous debug disable bucket. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`EKU_ENFORCEMENT_EN`	7801B0	30	1	To enable enforcement of the EKU field in the certificate, blow this device.
`OEM_HW_ID[0:15]`	7801B4	[47:32]	0	Represents the OEM hardware ID. Bits 15:0.
`OEM_PRODUCT_ID[0:15]`	7801B4	[63:48]	0	Represents the OEM product ID. Bits 15:0.
`ANTI_ROLLBACK_FEATURE_EN[0]`	7801BC	32	1

Bit 0 - BOOT_ANTI_ROLLBACK_EN

Bit 1 - TZAPPS_ANTI_ROLLBACK_EN

Bit 2 - PILSUBSYS_ANTI_ROLLBACK_EN

Bit 3 - MSA_ANTI_ROLLBACK_EN

`ANTI_ROLLBACK_FEATURE_EN[1]`	7801BC	33	1
`ANTI_ROLLBACK_FEATURE_EN[2]`	7801BC	34	1
`ANTI_ROLLBACK_FEATURE_EN[3]`	7801BC	35	1
PK hash
`PK hash 0[383:0]`	7802A0	[383:0]		The OEM-specific root certificate PK hash value.
OEM secure boot
`OEM_SECURE_BOOT1_PK_HASH_IN_FUSE`	780DA8	4	1	When this bit is ‘1’, use the value stored in OEM_PK_HASH for the root certificate hash.
`OEM_SECURE_BOOT1_AUTH_EN`	780DA8	5	1	To enable secure boot for apps and other peripheral images, blow this bit. When this bit is ‘1’, it enables authentication for any code that references secure boot configuration 1.
`OEM_SECURE_BOOT2_PK_HASH_IN_FUSE`	780DA8	12	1	For boot configuration 2: If this bit is ‘0’, use the internal ROM hash index and `OEM_SECURE_BOOT1_ROM_PK_HASH_IDX[3:0]` for the root certificate hash. If this bit is ‘1’, use the value stored in `OEM_PK_HASH` for the root certificate hash.
`OEM_SECURE_BOOT2_AUTH_EN`	780DA8	13	1	To enable the secure boot, blow this bit. When this bit is ‘1’, it enables authentication for any code that references secure boot.
`OEM_SECURE_BOOT3_PK_HASH_IN_FUSE`	780DA8	20	1	For boot configuration 3: If this bit is ‘0’, use the internal ROM hash index and `OEM_SECURE_BOOT1_ROM_PK_HASH_IDX[3:0]` for the root certificate hash. When this bit is ‘1’, use the value stored in `OEM_PK_HASH` for the root certificate hash.
`OEM_SECURE_BOOT3_AUTH_EN`	780DA8	21	1	To enable the secure boot, blow this bit. When this bit is ‘1’, it enables authentication for any code that references secure boot configuration 3.
Sec key derivation key
`Sec Key derivation Key[255:0]`	780DB8	[255:0]		This 256‑bit value is used as the secondary key derivation input, which is used to generate the secondary key for the crypto engine. When running in an insecure mode (no secure boot or Debug enabled), the SKDK is fed into the key derivation function to generate a unique non‑secure secondary key for use by the crypto engine. When running in a secure mode (secure boot and debug disabled), the SKDK is fed directly to the crypto engine as the secondary key. After the SKDK value has been correctly programmed, the SKDK Read Disable must be blown to permanently protect the SKDK value. The software reads the SKDK value from the QFPROM before this correction is made. The SBL fuse blow API can automatically generate a random number for use as the SKDK, ensuring that the SKDK value is never available outside of the device.

Fuse name	Start address (in hexadecimal)	Bit number	Fuse blow value	Description
Read permissions
Secondary Key derivation Key Read disable	780150	22	1	After provisioning the SKDK, blow this bit to secure the secondary key from being read back. A secure path hardware exists from SKDK to the crypto engine.
Write permissions
Read permissions write disable	780158	3	1	Blow this bit after the region has been provisioned to disable further QFPROM changes to this region.
FEC enables write disable	780158	5	1	Blow this bit after the region has been provisioned to disable further QFPROM changes to this region.
OEM configuration write disable	780158	10	1	Blow this bit after the region has been provisioned to disable further QFPROM changes to this region.
Public key hash 0 write disable	780158	12	1	Blow this bit after the region has been provisioned to disable further QFPROM changes to this region.
OEM secure boot write disable	780158	20	1	Blow this bit after the region has been provisioned to disable further QFPROM changes to this region.
Secondary key derivation key write disable	7801B0	22	1	Blow this bit after the region has been provisioned to disable further QFPROM changes to this region.
FEC enable
OEM secure boot FEC enable	780160	20	1	To enable FEC for OEM secure boot region, blow this bit. Ensure that the complete region is provisioned before FEC is enabled.
Secondary key derivation key FEC enable	780160	22	1	To enable FEC for the secondary KDF key, blow this bit. Ensure that the complete region is provisioned before FEC is enabled.
OEM Config
`WDOG_EN`	780188	14	1	Prevents the `WDOG_DISABLE` GPIO from disabling WDOG, freeing up the GPIO and preventing potential abuse by an attacker.
`APPS_APB_DFD_DISABLE`	780188	30	1	When blown will disable Qualcomm® Kryo™ B Scandump using APB bus. A corresponding Qualcomm fuse can override this OEM‑controlled fuse.
`DCC_DEBUG_DISABLE`	780188	31	1	When blown will be used to disable DCC IP in hardware. A corresponding Qualcomm fuse can override this OEM‑controlled fuse.
`DEBUG_BUS_DISABLE`	78018C	32	1	When blown will be used to disable debug bus from appearing on GPIOs. A corresponding Qualcomm fuse can override this OEM‑controlled fuse.
`AOSS_AOP_DFD_DISABLE`	78018C	33	1	When blown will disable the scan dump of RPMh. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`EUD_DISABLE`	78018C	34	1	When blown will disable EUD. A corresponding Qualcomm fuse can override this OEM‑controlled fuse.
`DAP_DEVICEEN_DISABLE`	78018C	35	1	When blown will disable the external debugger access to APB-AP port of QDSS DAP. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`APPS_DBGEN_DISABLE`	78018C	36	1	When blown will disable the non-secure invasive debug facilities of APPS (including the APPS processor) subsystem. A corresponding Qualcomm fuse can override this OEM‑controlled fuse.
`DAP_DBGEN_DISABLE`	78018C	37	1	When blown will block the NS=1 transactions from both AXI-AP port of DAP, and ETR, of QDSS subsystem. It also prevents the STM block of QDSS to generate any back pressure on the bus it receives the event traces. A corresponding Qualcomm fuse can override this OEM‑controlled fuse.
`LPASS_TURING_DBGEN_DISABLE`	780188	38	1	When blown will disable the invasive debug facilities of LPASS as well as Turing. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`WCSS_DBGEN_DISABLE`	78018C	39	1	When blown will disable the non-secure invasive debug facilities of WCSS subsystem. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`AOSS_AOP_DBGEN_DISABLE`	78018C	40	1	When blown will disable the non-secure invasive debug facilities of AOSS AOP. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`CAM_ICP_DBGEN_DISABLE`	78018C	41	1	When blown will disable the non-secure invasive debug facilities of camera A5. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`SSC_DBGEN_DISABLE`	78018C	42	1	When blown will disable the non-secure invasive debug facilities of Snapdragon sensor core subsystem. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`VENUS_0_DBGEN_DISABLE`	78018C	44	1	When blown will disable the non-secure invasive debug facilities of ARM9 processor in spectra subsytem. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`A5x_ISDB_DBGEN_DISABLE`	78018C	45	1	When blown will disable the non-secure invaisive debug facility of ISDB block of A5X subsystem. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`MSS_DBGEN_DISABLE`	78018C	46	1	When blown will disable the modem-secure invasive debug facilities of Modem subsystem (including Q6 processor). It also blocks the MSA = 1 transactions from AXI-AP port of QDSS DAP. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`APPS_NIDEN_DISABLE`	78018C	47	1	When blown will disable the non-secure non-invasive debug facilities of APPS (including APPS processor) subsystem. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`DAP_NIDEN_DISABLE`	78018C	48	1	When blown will instruct QDSS STM to drop the non-secure event traces. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`LPASS_TURING_NIDEN_DISABLE`	78018C	49	1	When blown will disable the non-secure non-invasive debug facilities of LPASS as well as Turing. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`WCSS_NIDEN_DISABLE`	78018C	50	1	When blown will disable the non-secure non-invasive debug facilities of WCSS subsystem. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`AOSS_AOP_NIDEN_DISABLE`	78018C	51	1	When blown will disable the non-secure non-invasive debug facilities of AOSS AOP. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`CAM_ICP_NIDEN_DISABLE`	78018C	52	1	When blown will disable the non-secure non-invasive debug facilities of Camera A5. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`SSC_NIDEN_DISABLE`	78018C	53	1	When blown will disable the non-secure non-invasive debug facilities of Snapdragon sensor core (including Q6 processor) subsystem. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`MSS_NIDEN_DISABLE`	78018C	54	1	When blown will disable the modem secure non-invasive debug facilities of MSS (including Q6 processor) subsystem. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`APPS_SPNIDEN_DISABLE`	78018C	55	1	When blown will disable the secure non-invasive debug facilities of APPS (including APPS processor) subsystem. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`DAP_SPNIDEN_DISABLE`	78018C	56	1	When blown will instruct QDSS STM to drop the secure event traces. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`APPS_SPIDEN_DISABLE`	78018C	60	1	When blown will disable the secure invasive debug facilities of APPS (including APPS processor) subsystem. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`DAP_SPIDEN_DISABLE`	78018C	61	1	When blown will block the NS = 0 transactions from both AXI-AP port of DAP, and ETR, of QDSS subsystem. It also prevents the STM block of QDSS to generate any backpressure on the bus it receives the event traces. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`LLCC_DSRW_DISABLE`	78018C	63	1	When blown will disable the secure invasive debug facilities of LLCC’s DSRW. A corresponding Qualcomm fuse can override this OEM-controlled fuse.
`EKU_ENFORCEMENT_EN`	780190	30	0	To enable enforcement of the EKU field in the certificate, blow this device.
`OEM_HW_ID[0:15]`	780194	[47:32]	0	Represents the OEM hardware ID. Bits 15:0.
`OEM_PRODUCT_ID[0:15]`	780194	[63:48]	0	Represents the OEM product ID. Bits 15:0.
`ANTI_ROLLBACK_FEATURE_EN[0]`	78019C	32	1

Bit 0 - BOOT_ANTI_ROLLBACK_EN

Bit 1 - TZAPPS_ANTI_ROLLBACK_EN

Bit 2 - PILSUBSYS_ANTI_ROLLBACK_EN

Bit 3 - MSA_ANTI_ROLLBACK_EN

`ANTI_ROLLBACK_FEATURE_EN[1]`	78019C	33	1
`ANTI_ROLLBACK_FEATURE_EN[2]`	78019C	34	1
`ANTI_ROLLBACK_FEATURE_EN[3]`	78019C	35	1
PK hash
`PK hash 0[383:0]`	7801C8	[383:0]		The OEM-specific root certificate PK hash value.
OEM secure boot
`OEM_SECURE_BOOT1_PK_HASH_IN_FUSE`	780360	4	1	When this bit is ‘1’, use the value stored in OEM_PK_HASH for the root certificate hash.
`OEM_SECURE_BOOT1_AUTH_EN`	780360	5	1	To enable secure boot for apps and other peripheral images, blow this bit. When this bit is ‘1’, it enables authentication for any code that references secure boot configuration 1.
`OEM_SECURE_BOOT2_PK_HASH_IN_FUSE`	780360	12	1	For boot configuration 2: If this bit is ‘0’, use the internal ROM hash index and `OEM_SECURE_BOOT1_ROM_PK_HASH_IDX[3:0]` for the root certificate hash. If this bit is ‘1’, use the value stored in `OEM_PK_HASH` for the root certificate hash.
`OEM_SECURE_BOOT2_AUTH_EN`	780360	13	1	To enable the secure boot, blow this bit. When this bit is ‘1’, it enables authentication for any code that references secure boot.
`OEM_SECURE_BOOT3_PK_HASH_IN_FUSE`	780360	20	1	For boot configuration 3: If this bit is ‘0’, use the internal ROM hash index and `OEM_SECURE_BOOT1_ROM_PK_HASH_IDX[3:0]` for the root certificate hash. When this bit is ‘1’, use the value stored in `OEM_PK_HASH` for the root certificate hash.
`OEM_SECURE_BOOT3_AUTH_EN`	780360	21	1	To enable the secure boot, blow this bit. When this bit is ‘1’, it enables authentication for any code that references secure boot configuration 3.
Sec key derivation key
`Sec Key derivation Key[255:0]`	780398	[255:0]		This 256‑bit value is used as the secondary key derivation input, which is used to generate the secondary key for the crypto engine. When running in an insecure mode (no secure boot or Debug enabled), the SKDK is fed into the key derivation function to generate a unique non‑secure secondary key for use by the crypto engine. When running in a secure mode (secure boot and debug disabled), the SKDK is fed directly to the crypto engine as the secondary key. After the SKDK value has been correctly programmed, the SKDK Read Disable must be blown to permanently protect the SKDK value. The software reads the SKDK value from the QFPROM before this correction is made. The SBL fuse blow API can automatically generate a random number for use as the SKDK, ensuring that the SKDK value is never available outside of the device.

Next steps

To ensure the that the cryptographic keys and certificates are generated and managed in a secure and trusted environment, see Generate keys and certificates.
To ensure the authenticity and integrity of software images and to write a complete software image, see Sign and flash the images.

​Next steps

Next steps