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:term:`SVE`”h]”h)”}”(hŒ:term:`SVE`”h]”h)”}”(hj h]”hŒSVE”…””}”(hhh!j ubah"}”(h$]”h&]”(h(Œstd”Œstd-term”eh+]”h-]”h/]”uh1hh!j ubah"}”(h$]”h&]”h+]”h-]”h/]”Œrefdoc”h9Œ refdomain”j Œreftype”Œterm”Œrefexplicit”‰Œrefwarn”ˆh?ŒSVE”uh1hhAhBhCK6h!j ubah"}”(h$]”h&]”h+]”ŒSVE”ah-]”h/]”uh1h hAhBhCK6h!hhhubh)”}”(hŒ.. |TBB| replace:: :term:`TBB`”h]”h)”}”(hŒ:term:`TBB`”h]”h)”}”(hj8 h]”hŒTBB”…””}”(hhh!j: ubah"}”(h$]”h&]”(h(Œstd”Œstd-term”eh+]”h-]”h/]”uh1hh!j6 ubah"}”(h$]”h&]”h+]”h-]”h/]”Œrefdoc”h9Œ refdomain”jD Œreftype”Œterm”Œrefexplicit”‰Œrefwarn”ˆh?ŒTBB”uh1hhAhBhCK7h!j2 ubah"}”(h$]”h&]”h+]”ŒTBB”ah-]”h/]”uh1h hAhBhCK7h!hhhubh)”}”(hŒ .. |TBBR| replace:: :term:`TBBR`”h]”h)”}”(hŒ:term:`TBBR`”h]”h)”}”(hjc h]”hŒTBBR”…””}”(hhh!je ubah"}”(h$]”h&]”(h(Œstd”Œstd-term”eh+]”h-]”h/]”uh1hh!ja ubah"}”(h$]”h&]”h+]”h-]”h/]”Œrefdoc”h9Œ refdomain”jo Œreftype”Œterm”Œrefexplicit”‰Œrefwarn”ˆh?ŒTBBR”uh1hhAhBhCK8h!j] ubah"}”(h$]”h&]”h+]”ŒTBBR”ah-]”h/]”uh1h hAhBhCK8h!hhhubh)”}”(hŒ.. |TEE| replace:: :term:`TEE`”h]”h)”}”(hŒ:term:`TEE`”h]”h)”}”(hjŽ h]”hŒTEE”…””}”(hhh!j ubah"}”(h$]”h&]”(h(Œstd”Œstd-term”eh+]”h-]”h/]”uh1hh!jŒ ubah"}”(h$]”h&]”h+]”h-]”h/]”Œrefdoc”h9Œ refdomain”jš Œreftype”Œterm”Œrefexplicit”‰Œrefwarn”ˆh?ŒTEE”uh1hhAhBhCK9h!jˆ ubah"}”(h$]”h&]”h+]”ŒTEE”ah-]”h/]”uh1h hAhBhCK9h!hhhubh)”}”(hŒ .. |TF-A| replace:: :term:`TF-A`”h]”h)”}”(hŒ:term:`TF-A`”h]”h)”}”(hj¹ h]”hŒTF-A”…””}”(hhh!j» ubah"}”(h$]”h&]”(h(Œstd”Œstd-term”eh+]”h-]”h/]”uh1hh!j· ubah"}”(h$]”h&]”h+]”h-]”h/]”Œrefdoc”h9Œ refdomain”jÅ Œreftype”Œterm”Œrefexplicit”‰Œrefwarn”ˆh?ŒTF-A”uh1hhAhBhCK:h!j³ ubah"}”(h$]”h&]”h+]”ŒTF-A”ah-]”h/]”uh1h hAhBhCK:h!hhhubh)”}”(hŒ .. |TF-M| replace:: :term:`TF-M`”h]”h)”}”(hŒ:term:`TF-M`”h]”h)”}”(hjä h]”hŒTF-M”…””}”(hhh!jæ ubah"}”(h$]”h&]”(h(Œstd”Œstd-term”eh+]”h-]”h/]”uh1hh!jâ ubah"}”(h$]”h&]”h+]”h-]”h/]”Œrefdoc”h9Œ refdomain”jð Œreftype”Œterm”Œrefexplicit”‰Œrefwarn”ˆh?ŒTF-M”uh1hhAhBhCK;h!jÞ ubah"}”(h$]”h&]”h+]”ŒTF-M”ah-]”h/]”uh1h hAhBhCK;h!hhhubh)”}”(hŒ.. |TLB| replace:: :term:`TLB`”h]”h)”}”(hŒ:term:`TLB`”h]”h)”}”(hj h]”hŒTLB”…””}”(hhh!j ubah"}”(h$]”h&]”(h(Œstd”Œstd-term”eh+]”h-]”h/]”uh1hh!j ubah"}”(h$]”h&]”h+]”h-]”h/]”Œrefdoc”h9Œ refdomain”j Œreftype”Œterm”Œrefexplicit”‰Œrefwarn”ˆh?ŒTLB”uh1hhAhBhCKh!j_ ubah"}”(h$]”h&]”h+]”ŒTRNG”ah-]”h/]”uh1h hAhBhCK>h!hhhubh)”}”(hŒ.. |TSP| replace:: :term:`TSP`”h]”h)”}”(hŒ:term:`TSP`”h]”h)”}”(hj h]”hŒTSP”…””}”(hhh!j’ ubah"}”(h$]”h&]”(h(Œstd”Œstd-term”eh+]”h-]”h/]”uh1hh!jŽ ubah"}”(h$]”h&]”h+]”h-]”h/]”Œrefdoc”h9Œ refdomain”jœ Œreftype”Œterm”Œrefexplicit”‰Œrefwarn”ˆh?ŒTSP”uh1hhAhBhCK?h!jŠ ubah"}”(h$]”h&]”h+]”ŒTSP”ah-]”h/]”uh1h hAhBhCK?h!hhhubh)”}”(hŒ.. |TZC| replace:: :term:`TZC`”h]”h)”}”(hŒ:term:`TZC`”h]”h)”}”(hj» h]”hŒTZC”…””}”(hhh!j½ ubah"}”(h$]”h&]”(h(Œstd”Œstd-term”eh+]”h-]”h/]”uh1hh!j¹ ubah"}”(h$]”h&]”h+]”h-]”h/]”Œrefdoc”h9Œ refdomain”jÇ Œreftype”Œterm”Œrefexplicit”‰Œrefwarn”ˆh?ŒTZC”uh1hhAhBhCK@h!jµ ubah"}”(h$]”h&]”h+]”ŒTZC”ah-]”h/]”uh1h hAhBhCK@h!hhhubh)”}”(hŒ".. |UBSAN| replace:: :term:`UBSAN`”h]”h)”}”(hŒ :term:`UBSAN`”h]”h)”}”(hjæ h]”hŒUBSAN”…””}”(hhh!jè ubah"}”(h$]”h&]”(h(Œstd”Œstd-term”eh+]”h-]”h/]”uh1hh!jä ubah"}”(h$]”h&]”h+]”h-]”h/]”Œrefdoc”h9Œ refdomain”jò Œreftype”Œterm”Œrefexplicit”‰Œrefwarn”ˆh?ŒUBSAN”uh1hhAhBhCKAh!jà ubah"}”(h$]”h&]”h+]”ŒUBSAN”ah-]”h/]”uh1h hAhBhCKAh!hhhubh)”}”(hŒ .. |UEFI| replace:: :term:`UEFI`”h]”h)”}”(hŒ:term:`UEFI`”h]”h)”}”(hjh]”hŒUEFI”…””}”(hhh!jubah"}”(h$]”h&]”(h(Œstd”Œstd-term”eh+]”h-]”h/]”uh1hh!jubah"}”(h$]”h&]”h+]”h-]”h/]”Œrefdoc”h9Œ refdomain”jŒreftype”Œterm”Œrefexplicit”‰Œrefwarn”ˆh?ŒUEFI”uh1hhAhBhCKBh!jubah"}”(h$]”h&]”h+]”ŒUEFI”ah-]”h/]”uh1h hAhBhCKBh!hhhubh)”}”(hŒ .. |WDOG| replace:: :term:`WDOG`”h]”h)”}”(hŒ:term:`WDOG`”h]”h)”}”(hj<h]”hŒWDOG”…””}”(hhh!j>ubah"}”(h$]”h&]”(h(Œstd”Œstd-term”eh+]”h-]”h/]”uh1hh!j:ubah"}”(h$]”h&]”h+]”h-]”h/]”Œrefdoc”h9Œ refdomain”jHŒreftype”Œterm”Œrefexplicit”‰Œrefwarn”ˆh?ŒWDOG”uh1hhAhBhCKCh!j6ubah"}”(h$]”h&]”h+]”ŒWDOG”ah-]”h/]”uh1h hAhBhCKCh!hhhubh)”}”(hŒ!.. |XLAT| replace:: :term:`XLAT` ”h]”h)”}”(hŒ:term:`XLAT`”h]”h)”}”(hjgh]”hŒXLAT”…””}”(hhh!jiubah"}”(h$]”h&]”(h(Œstd”Œstd-term”eh+]”h-]”h/]”uh1hh!jeubah"}”(h$]”h&]”h+]”h-]”h/]”Œrefdoc”h9Œ refdomain”jsŒreftype”Œterm”Œrefexplicit”‰Œrefwarn”ˆh?ŒXLAT”uh1hhAhBhCKDh!jaubah"}”(h$]”h&]”h+]”ŒXLAT”ah-]”h/]”uh1h hAhBhCKDh!hhhubh Œsection”“”)”}”(hhh]”(h Œtitle”“”)”}”(hŒAlternative Boot Flows”h]”hŒAlternative Boot Flows”…””}”(hj•h!j“hhhANhCNubah"}”(h$]”h&]”h+]”h-]”h/]”uh1j‘h!jŽhhhAŒV/home/test/workspace/code/optee_3.16/trusted-firmware-a/docs/design/alt-boot-flows.rst”hCKubj)”}”(hhh]”(j’)”}”(hŒ"EL3 payloads alternative boot flow”h]”hŒ"EL3 payloads alternative boot flow”…””}”(hj§h!j¥hhhANhCNubah"}”(h$]”h&]”h+]”h-]”h/]”uh1j‘h!j¢hhhAj¡hCKubh Œ paragraph”“”)”}”(hŒÏOn a pre-production system, the ability to execute arbitrary, bare-metal code at the highest exception level is required. It allows full, direct access to the hardware, for example to run silicon soak tests.”h]”hŒÏOn a pre-production system, the ability to execute arbitrary, bare-metal code at the highest exception level is required. It allows full, direct access to the hardware, for example to run silicon soak tests.”…””}”(hj·h!jµhhhANhCNubah"}”(h$]”h&]”h+]”h-]”h/]”uh1j³hAj¡hCKh!j¢hhubj´)”}”(hŒÕAlthough it is possible to implement some baremetal secure firmware from scratch, this is a complex task on some platforms, depending on the level of configuration required to put the system in the expected state.”h]”hŒÕAlthough it is possible to implement some baremetal secure firmware from scratch, this is a complex task on some platforms, depending on the level of configuration required to put the system in the expected state.”…””}”(hjÅh!jÃhhhANhCNubah"}”(h$]”h&]”h+]”h-]”h/]”uh1j³hAj¡hCKh!j¢hhubj´)”}”(hXSRather than booting a baremetal application, a possible compromise is to boot ``EL3 payloads`` through TF-A instead. This is implemented as an alternative boot flow, where a modified BL2 boots an EL3 payload, instead of loading the other BL images and passing control to BL31. It reduces the complexity of developing EL3 baremetal code by:”h]”(hŒNRather than booting a baremetal application, a possible compromise is to boot ”…””}”(hŒNRather than booting a baremetal application, a possible compromise is to boot ”h!jÑhhhANhCNubh Œliteral”“”)”}”(hŒ``EL3 payloads``”h]”hŒEL3 payloads”…””}”(hhh!jÜubah"}”(h$]”h&]”h+]”h-]”h/]”uh1jÚh!jÑubhŒõ through TF-A instead. This is implemented as an alternative boot flow, where a modified BL2 boots an EL3 payload, instead of loading the other BL images and passing control to BL31. It reduces the complexity of developing EL3 baremetal code by:”…””}”(hŒõ through TF-A instead. This is implemented as an alternative boot flow, where a modified BL2 boots an EL3 payload, instead of loading the other BL images and passing control to BL31. It reduces the complexity of developing EL3 baremetal code by:”h!jÑhhhANhCNubeh"}”(h$]”h&]”h+]”h-]”h/]”uh1j³hAj¡hCKh!j¢hhubh Œbullet_list”“”)”}”(hhh]”(h Œ list_item”“”)”}”(hŒ4putting the system into a known architectural state;”h]”j´)”}”(hjþh]”hŒ4putting the system into a known architectural state;”…””}”(hjþh!jubah"}”(h$]”h&]”h+]”h-]”h/]”uh1j³hAj¡hCKh!jüubah"}”(h$]”h&]”h+]”h-]”h/]”uh1júh!j÷hhhAj¡hCNubjû)”}”(hŒ4taking care of platform secure world initialization;”h]”j´)”}”(hjh]”hŒ4taking care of platform secure world initialization;”…””}”(hjh!jubah"}”(h$]”h&]”h+]”h-]”h/]”uh1j³hAj¡hCKh!jubah"}”(h$]”h&]”h+]”h-]”h/]”uh1júh!j÷hhhAj¡hCNubjû)”}”(hŒ7loading the SCP_BL2 image if required by the platform. ”h]”j´)”}”(hŒ6loading the SCP_BL2 image if required by the platform.”h]”hŒ6loading the SCP_BL2 image if required by the platform.”…””}”(hj0h!j.ubah"}”(h$]”h&]”h+]”h-]”h/]”uh1j³hAj¡hCKh!j*ubah"}”(h$]”h&]”h+]”h-]”h/]”uh1júh!j÷hhhAj¡hCNubeh"}”(h$]”h&]”h+]”h-]”h/]”Œbullet”Œ-”uh1jõhAj¡hCKh!j¢hhubj´)”}”(hXWhen booting an EL3 payload on Arm standard platforms, the configuration of the TrustZone controller is simplified such that only region 0 is enabled and is configured to permit secure access only. This gives full access to the whole DRAM to the EL3 payload.”h]”hXWhen booting an EL3 payload on Arm standard platforms, the configuration of the TrustZone controller is simplified such that only region 0 is enabled and is configured to permit secure access only. This gives full access to the whole DRAM to the EL3 payload.”…””}”(hjLh!jJhhhANhCNubah"}”(h$]”h&]”h+]”h-]”h/]”uh1j³hAj¡hCKh!j¢hhubj´)”}”(hŒcThe system is left in the same state as when entering BL31 in the default boot flow. In particular:”h]”hŒcThe system is left in the same state as when entering BL31 in the default boot flow. In particular:”…””}”(hjZh!jXhhhANhCNubah"}”(h$]”h&]”h+]”h-]”h/]”uh1j³hAj¡hCKh!j¢hhubjö)”}”(hhh]”(jû)”}”(hŒRunning in EL3;”h]”j´)”}”(hjkh]”hŒRunning in EL3;”…””}”(hjkh!jmubah"}”(h$]”h&]”h+]”h-]”h/]”uh1j³hAj¡hCK!h!jiubah"}”(h$]”h&]”h+]”h-]”h/]”uh1júh!jfhhhAj¡hCNubjû)”}”(hŒCurrent state is AArch64;”h]”j´)”}”(hj‚h]”hŒCurrent state is AArch64;”…””}”(hj‚h!j„ubah"}”(h$]”h&]”h+]”h-]”h/]”uh1j³hAj¡hCK"h!j€ubah"}”(h$]”h&]”h+]”h-]”h/]”uh1júh!jfhhhAj¡hCNubjû)”}”(hŒLittle-endian data access;”h]”j´)”}”(hj™h]”hŒLittle-endian data access;”…””}”(hj™h!j›ubah"}”(h$]”h&]”h+]”h-]”h/]”uh1j³hAj¡hCK#h!j—ubah"}”(h$]”h&]”h+]”h-]”h/]”uh1júh!jfhhhAj¡hCNubjû)”}”(hŒAll exceptions disabled;”h]”j´)”}”(hj°h]”hŒAll exceptions disabled;”…””}”(hj°h!j²ubah"}”(h$]”h&]”h+]”h-]”h/]”uh1j³hAj¡hCK$h!j®ubah"}”(h$]”h&]”h+]”h-]”h/]”uh1júh!jfhhhAj¡hCNubjû)”}”(hŒ MMU disabled;”h]”j´)”}”(hjÇh]”hŒ MMU disabled;”…””}”(hjÇh!jÉubah"}”(h$]”h&]”h+]”h-]”h/]”uh1j³hAj¡hCK%h!jÅubah"}”(h$]”h&]”h+]”h-]”h/]”uh1júh!jfhhhAj¡hCNubjû)”}”(hŒCaches disabled. ”h]”j´)”}”(hŒCaches disabled.”h]”hŒCaches disabled.”…””}”(hjâh!jàubah"}”(h$]”h&]”h+]”h-]”h/]”uh1j³hAj¡hCK&h!jÜubah"}”(h$]”h&]”h+]”h-]”h/]”uh1júh!jfhhhAj¡hCNubeh"}”(h$]”h&]”h+]”h-]”h/]”jHjIuh1jõhAj¡hCK!h!j¢hhubh Œtarget”“”)”}”(hŒ.. _alt_boot_flows_el3_payload:”h]”h"}”(h$]”h&]”h+]”h-]”h/]”Œrefid”Œalt-boot-flows-el3-payload”uh1júhCKmh!j¢hhhAj¡ubj)”}”(hhh]”(j’)”}”(hŒBooting an EL3 payload”h]”hŒBooting an EL3 payload”…””}”(hj h!j hhhANhCNubah"}”(h$]”h&]”h+]”h-]”h/]”uh1j‘h!j hhhAj¡hCK+ubj´)”}”(hŒŒThe EL3 payload image is a standalone image and is not part of the FIP. It is not loaded by TF-A. Therefore, there are 2 possible scenarios:”h]”hŒŒThe EL3 payload image is a standalone image and is not part of the FIP. It is not loaded by TF-A. Therefore, there are 2 possible scenarios:”…””}”(hj h!j hhhANhCNubah"}”(h$]”h&]”h+]”h-]”h/]”uh1j³hAj¡hCK-h!j hhubjö)”}”(hhh]”(jû)”}”(hŒÐThe EL3 payload may reside in non-volatile memory (NVM) and execute in place. In this case, booting it is just a matter of specifying the right address in NVM through ``EL3_PAYLOAD_BASE`` when building TF-A. ”h]”j´)”}”(hŒÏThe EL3 payload may reside in non-volatile memory (NVM) and execute in place. In this case, booting it is just a matter of specifying the right address in NVM through ``EL3_PAYLOAD_BASE`` when building TF-A.”h]”(hŒ§The EL3 payload may reside in non-volatile memory (NVM) and execute in place. In this case, booting it is just a matter of specifying the right address in NVM through ”…””}”(hŒ§The EL3 payload may reside in non-volatile memory (NVM) and execute in place. In this case, booting it is just a matter of specifying the right address in NVM through ”h!j. ubjÛ)”}”(hŒ``EL3_PAYLOAD_BASE``”h]”hŒEL3_PAYLOAD_BASE”…””}”(hhh!j7 ubah"}”(h$]”h&]”h+]”h-]”h/]”uh1jÚh!j. ubhŒ when building TF-A.”…””}”(hŒ when building TF-A.”h!j. ubeh"}”(h$]”h&]”h+]”h-]”h/]”uh1j³hAj¡hCK0h!j* ubah"}”(h$]”h&]”h+]”h-]”h/]”uh1júh!j' hhhAj¡hCNubjû)”}”(hŒOThe EL3 payload needs to be loaded in volatile memory (e.g. DRAM) at run-time. ”h]”j´)”}”(hŒNThe EL3 payload needs to be loaded in volatile memory (e.g. DRAM) at run-time.”h]”hŒNThe EL3 payload needs to be loaded in volatile memory (e.g. DRAM) at run-time.”…””}”(hj\ h!jZ ubah"}”(h$]”h&]”h+]”h-]”h/]”uh1j³hAj¡hCK4h!jV ubah"}”(h$]”h&]”h+]”h-]”h/]”uh1júh!j' hhhAj¡hCNubeh"}”(h$]”h&]”h+]”h-]”h/]”jHjIuh1jõhAj¡hCK0h!j hhubj´)”}”(hXTo help in the latter scenario, the ``SPIN_ON_BL1_EXIT=1`` build option can be used. The infinite loop that it introduces in BL1 stops execution at the right moment for a debugger to take control of the target and load the payload (for example, over JTAG).”h]”(hŒ$To help in the latter scenario, the ”…””}”(hŒ$To help in the latter scenario, the ”h!jt hhhANhCNubjÛ)”}”(hŒ``SPIN_ON_BL1_EXIT=1``”h]”hŒSPIN_ON_BL1_EXIT=1”…””}”(hhh!j} ubah"}”(h$]”h&]”h+]”h-]”h/]”uh1jÚh!jt ubhŒÆ build option can be used. The infinite loop that it introduces in BL1 stops execution at the right moment for a debugger to take control of the target and load the payload (for example, over JTAG).”…””}”(hŒÆ build option can be used. The infinite loop that it introduces in BL1 stops execution at the right moment for a debugger to take control of the target and load the payload (for example, over JTAG).”h!jt hhhANhCNubeh"}”(h$]”h&]”h+]”h-]”h/]”uh1j³hAj¡hCK7h!j hhubj´)”}”(hŒéIt is expected that this loading method will work in most cases, as a debugger connection is usually available in a pre-production system. The user is free to use any other platform-specific mechanism to load the EL3 payload, though.”h]”hŒéIt is expected that this loading method will work in most cases, as a debugger connection is usually available in a pre-production system. The user is free to use any other platform-specific mechanism to load the EL3 payload, though.”…””}”(hj˜ h!j– hhhANhCNubah"}”(h$]”h&]”h+]”h-]”h/]”uh1j³hAj¡hCK