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7 On a pre-production system, the ability to execute arbitrary, bare-metal code at
8 the highest exception level is required. It allows full, direct access to the
9 hardware, for example to run silicon soak tests.
11 Although it is possible to implement some baremetal secure firmware from
13 configuration required to put the system in the expected state.
15 Rather than booting a baremetal application, a possible compromise is to boot
18 other BL images and passing control to BL31. It reduces the complexity of
27 configured to permit secure access only. This gives full access to the whole
28 DRAM to the EL3 payload.
52 - The EL3 payload needs to be loaded in volatile memory (e.g. DRAM) at
57 moment for a debugger to take control of the target and load the payload (for
61 connection is usually available in a pre-production system. The user is free to
62 use any other platform-specific mechanism to load the EL3 payload, though.
68 Some platforms have the ability to preload BL33 into memory instead of relying
69 on TF-A to load it. This may simplify packaging of the normal world code and
71 is complete, TF-A simply jumps to a BL33 base address provided at build time.
73 For this option to be used, the ``PRELOADED_BL33_BASE`` build option has to be
75 without a BL33 and prepare to jump to a BL33 image loaded at address