1Arm Development Platform Build Options 2====================================== 3 4Arm Platform Build Options 5-------------------------- 6 7- ``ARM_BL31_IN_DRAM``: Boolean option to select loading of BL31 in TZC secured 8 DRAM. By default, BL31 is in the secure SRAM. Set this flag to 1 to load 9 BL31 in TZC secured DRAM. If TSP is present, then setting this option also 10 sets the TSP location to DRAM and ignores the ``ARM_TSP_RAM_LOCATION`` build 11 flag. 12 13- ``ARM_CONFIG_CNTACR``: boolean option to unlock access to the ``CNTBase<N>`` 14 frame registers by setting the ``CNTCTLBase.CNTACR<N>`` register bits. The 15 frame number ``<N>`` is defined by ``PLAT_ARM_NSTIMER_FRAME_ID``, which 16 should match the frame used by the Non-Secure image (normally the Linux 17 kernel). Default is true (access to the frame is allowed). 18 19- ``ARM_DISABLE_TRUSTED_WDOG``: boolean option to disable the Trusted Watchdog. 20 By default, Arm platforms use a watchdog to trigger a system reset in case 21 an error is encountered during the boot process (for example, when an image 22 could not be loaded or authenticated). The watchdog is enabled in the early 23 platform setup hook at BL1 and disabled in the BL1 prepare exit hook. The 24 Trusted Watchdog may be disabled at build time for testing or development 25 purposes. 26 27- ``ARM_LINUX_KERNEL_AS_BL33``: The Linux kernel expects registers x0-x3 to 28 have specific values at boot. This boolean option allows the Trusted Firmware 29 to have a Linux kernel image as BL33 by preparing the registers to these 30 values before jumping to BL33. This option defaults to 0 (disabled). For 31 AArch64 ``RESET_TO_BL31`` and for AArch32 ``RESET_TO_SP_MIN`` must be 1 when 32 using it. If this option is set to 1, ``ARM_PRELOADED_DTB_BASE`` must be set 33 to the location of a device tree blob (DTB) already loaded in memory. The 34 Linux Image address must be specified using the ``PRELOADED_BL33_BASE`` 35 option. 36 37- ``ARM_PLAT_MT``: This flag determines whether the Arm platform layer has to 38 cater for the multi-threading ``MT`` bit when accessing MPIDR. When this flag 39 is set, the functions which deal with MPIDR assume that the ``MT`` bit in 40 MPIDR is set and access the bit-fields in MPIDR accordingly. Default value of 41 this flag is 0. Note that this option is not used on FVP platforms. 42 43- ``ARM_RECOM_STATE_ID_ENC``: The PSCI1.0 specification recommends an encoding 44 for the construction of composite state-ID in the power-state parameter. 45 The existing PSCI clients currently do not support this encoding of 46 State-ID yet. Hence this flag is used to configure whether to use the 47 recommended State-ID encoding or not. The default value of this flag is 0, 48 in which case the platform is configured to expect NULL in the State-ID 49 field of power-state parameter. 50 51- ``ARM_ROTPK_LOCATION``: used when ``TRUSTED_BOARD_BOOT=1``. It specifies the 52 location of the ROTPK returned by the function ``plat_get_rotpk_info()`` 53 for Arm platforms. Depending on the selected option, the proper private key 54 must be specified using the ``ROT_KEY`` option when building the Trusted 55 Firmware. This private key will be used by the certificate generation tool 56 to sign the BL2 and Trusted Key certificates. Available options for 57 ``ARM_ROTPK_LOCATION`` are: 58 59 - ``regs`` : return the ROTPK hash stored in the Trusted root-key storage 60 registers. 61 - ``devel_rsa`` : return a development public key hash embedded in the BL1 62 and BL2 binaries. This hash has been obtained from the RSA public key 63 ``arm_rotpk_rsa.der``, located in ``plat/arm/board/common/rotpk``. To use 64 this option, ``arm_rotprivk_rsa.pem`` must be specified as ``ROT_KEY`` 65 when creating the certificates. 66 - ``devel_ecdsa`` : return a development public key hash embedded in the BL1 67 and BL2 binaries. This hash has been obtained from the ECDSA public key 68 ``arm_rotpk_ecdsa.der``, located in ``plat/arm/board/common/rotpk``. To 69 use this option, ``arm_rotprivk_ecdsa.pem`` must be specified as 70 ``ROT_KEY`` when creating the certificates. 71 - ``devel_full_dev_rsa_key`` : returns a development public key embedded in 72 the BL1 and BL2 binaries. This key has been obtained from the RSA public 73 key ``arm_rotpk_rsa.der``, located in ``plat/arm/board/common/rotpk``. 74 75- ``ARM_ROTPK_HASH``: used when ``ARM_ROTPK_LOCATION=devel_*``, excluding 76 ``devel_full_dev_rsa_key``. Specifies the location of the ROTPK hash. Not 77 expected to be a build option. This defaults to 78 ``plat/arm/board/common/rotpk/*_sha256.bin`` depending on the specified 79 algorithm. Providing ``ROT_KEY`` enforces generation of the hash from the 80 ``ROT_KEY`` and overwrites the default hash file. 81 82- ``ARM_TSP_RAM_LOCATION``: location of the TSP binary. Options: 83 84 - ``tsram`` : Trusted SRAM (default option when TBB is not enabled) 85 - ``tdram`` : Trusted DRAM (if available) 86 - ``dram`` : Secure region in DRAM (default option when TBB is enabled, 87 configured by the TrustZone controller) 88 89- ``ARM_XLAT_TABLES_LIB_V1``: boolean option to compile TF-A with version 1 90 of the translation tables library instead of version 2. It is set to 0 by 91 default, which selects version 2. 92 93- ``ARM_GPT_SUPPORT``: Enable GPT parser to get the entry address and length of 94 the various partitions present in the GPT image. This support is available 95 only for the BL2 component, and it is disabled by default. 96 The following diagram shows the view of the FIP partition inside the GPT 97 image: 98 99 |FIP in a GPT image| 100 101For a better understanding of these options, the Arm development platform memory 102map is explained in the :ref:`Firmware Design`. 103 104.. _build_options_arm_css_platform: 105 106Arm CSS Platform-Specific Build Options 107--------------------------------------- 108 109- ``CSS_DETECT_PRE_1_7_0_SCP``: Boolean flag to detect SCP version 110 incompatibility. Version 1.7.0 of the SCP firmware made a non-backwards 111 compatible change to the MTL protocol, used for AP/SCP communication. 112 TF-A no longer supports earlier SCP versions. If this option is set to 1 113 then TF-A will detect if an earlier version is in use. Default is 1. 114 115- ``CSS_LOAD_SCP_IMAGES``: Boolean flag, which when set, adds SCP_BL2 and 116 SCP_BL2U to the FIP and FWU_FIP respectively, and enables them to be loaded 117 during boot. Default is 1. 118 119- ``CSS_USE_SCMI_SDS_DRIVER``: Boolean flag which selects SCMI/SDS drivers 120 instead of SCPI/BOM driver for communicating with the SCP during power 121 management operations and for SCP RAM Firmware transfer. If this option 122 is set to 1, then SCMI/SDS drivers will be used. Default is 0. 123 124- ``CSS_SYSTEM_GRACEFUL_RESET``: Build option to enable graceful powerdown of 125 CPU core on reset. This build option can be used on CSS platforms that 126 require all the CPUs to execute the CPU specific power down sequence to 127 complete a warm reboot sequence in which only the CPUs are power cycled. 128 129Arm FVP Build Options 130--------------------- 131 132- ``FVP_TRUSTED_SRAM_SIZE``: Size (in kilobytes) of the Trusted SRAM region to 133 utilize when building for the FVP platform. This option defaults to 256. 134 135Arm Juno Build Options 136---------------------- 137 138- ``JUNO_AARCH32_EL3_RUNTIME``: This build flag enables you to execute EL3 139 runtime software in AArch32 mode, which is required to run AArch32 on Juno. 140 By default this flag is set to '0'. Enabling this flag builds BL1 and BL2 in 141 AArch64 and facilitates the loading of ``SP_MIN`` and BL33 as AArch32 executable 142 images. 143 144Arm Neoverse RD Platform Build Options 145-------------------------------------- 146 147 - ``NRD_CHIP_COUNT``: Configures the number of chips on a Neoverse RD platform 148 which supports multi-chip operation. If ``NRD_CHIP_COUNT`` is set to any 149 valid value greater than 1, the platform code performs required configuration 150 to support multi-chip operation. 151 152- ``NRD_PLATFORM_VARIANT``: Selects the variant of a Neoverse RD platform. A 153 particular Neoverse RD platform may have multiple variants which may differ in 154 core count, cluster count or other peripherals. This build option is used to 155 select the appropriate platform variant for the build. The range of valid 156 values is platform specific. 157 158-------------- 159 160.. |FIP in a GPT image| image:: ../../resources/diagrams/FIP_in_a_GPT_image.png 161 162*Copyright (c) 2019-2024, Arm Limited. All rights reserved.* 163
