8 mandatory and optional modifications for both the cold and warm boot paths.
17 implementation of variables and functions to fulfill the optional requirements
56 either mandatory or optional.
529 The following constants are optional. They should be defined when the platform
639 The following constant is optional. It should be defined to override the default
877 This function is optional when Trusted Board Boot is enabled. If this
1255 Common optional modifications
1545 Struct: plat_try_images_ops [optional]
1548 This optional structure holds platform hooks for alternative images load.
1553 Function : plat_setup_try_img_ops [optional]  argument
1561 This optional function is called to register platform try images ops, given
1564 Function : plat_try_images_ops.next_instance [optional]  argument
1572 This optional function tries to load images from alternative places.
1579 Function : plat_setup_log_gpt_corrupted [optional]  argument
1587 This optional function is called to register platform log GPT corrupted functions,
1590 Function : plat_setup_log_gpt_corrupted.plat_set_gpt_corruption [optional]  argument
1598 This optional function will log error information if the GPT is corrupted, by
1603 Function : plat_setup_log_gpt_corrupted.plat_log_gpt_corruption [optional]  argument
1611 This optional function will log if the primary GPT is corrupted, by writing
1732 Function : bl1_plat_prepare_exit() [optional]
1746 Function : bl1_plat_set_ep_info() [optional]
1758 Function : bl1_plat_get_next_image_id() [optional]
1777 Function : bl1_plat_get_image_desc() [optional]
1793 Function : bl1_plat_handle_pre_image_load() [optional]
1805 Function : bl1_plat_calc_bl2_layout() [optional]
1817 Function : bl1_plat_handle_post_image_load() [optional]
1835 Function : bl1_plat_fwu_done() [optional]
1874 Function : bl1_plat_is_shared_nv_ctr() [optional]
1963 Function : bl2_plat_handle_pre_image_load() [optional]
1975 Function : bl2_plat_handle_post_image_load() [optional]
1987 Function : bl2_plat_preload_setup [optional]
1995 This optional function performs any BL2 platform initialization
2053 Function : bl2_el3_plat_prepare_exit() [optional]
2069 The AP Firmware Updater Configuration, BL2U, is an optional part of the FWU
2073 #. (Optional) Transferring the optional SCP_BL2U binary image from AP secure
2140 Function : bl2u_plat_handle_scp_bl2u() [optional]
2286 Function : bl31_plat_runtime_setup() [optional]
2514 This is an optional interface from the RMM-EL3 interface v0.4 onwards.
2688 Function : bl31_plat_enable_mmu [optional]
2707 Function : plat_init_apkey [optional]
2739 #define : PLAT_PERCPU_BAKERY_LOCK_SIZE [optional]
2764 and functions, of which some are optional, and some others mandatory.
2790 Function: int plat_sdei_validate_entry_point() [optional]
2812 Function: void plat_sdei_handle_masked_trigger(uint64_t mpidr, unsigned int intr) [optional]
2918 Function : plat_psci_stat_accounting_start() [optional]
2926 This is an optional hook that platforms can implement for residency statistics
2936 Function : plat_psci_stat_accounting_stop() [optional]
2944 This is an optional hook that platforms can implement for residency statistics
2954 Function : plat_psci_stat_get_residency() [optional]
2962 This is an optional interface that is is invoked after resuming from a low power
2974 Function : plat_get_target_pwr_state() [optional]
3064 plat_psci_ops.pwr_domain_off_early() [optional]
3067 This optional function performs the platform specific actions to check if
3097 plat_psci_ops.pwr_domain_validate_suspend() [optional]
3100 This is an optional function that is only compiled into the build if the build
3108 plat_psci_ops.pwr_domain_suspend_pwrdown_early() [optional]
3111 This optional function may be used as a performance optimization to replace
3169 This is an optional function and, if implemented, is expected to perform
3203 plat_psci_ops.pwr_domain_on_finish_late() [optional]
3206 This optional function is called by the PSCI implementation after the calling
3282 This is an optional function and, if implemented, is invoked by the PSCI
3293 This is an optional function and, if implemented, verifies the ``power_state``
3313 This is an optional function. If implemented this function is intended to return
3328 This is an optional function. If implemented this function is
3342 This is an optional function. If implemented it enables or disables the
3351 This is an optional function. If implemented it returns the current
3359 This is an optional function. If implemented it checks if a memory
3765 Function : plat_setup_early_console [optional]
3972    version will be enabled by default and any optional Arch feature supported by
3975    and optional Arch specific features.