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Diffstat (limited to 'docs/porting-guide.rst')
| -rw-r--r-- | docs/porting-guide.rst | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/docs/porting-guide.rst b/docs/porting-guide.rst index 6352bb95..f0a8aaf3 100644 --- a/docs/porting-guide.rst +++ b/docs/porting-guide.rst @@ -1596,6 +1596,34 @@ BL2 is responsible for loading the normal world BL33 image (e.g. UEFI). This function isn't needed if either ``PRELOADED_BL33_BASE`` or ``EL3_PAYLOAD_BASE`` build options are used. +Function : bl2\_plat\_preload\_setup [optional] +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +:: + Argument : void + Return : void + +This optional function performs any BL2 platform initialization +required before image loading, that is not done later in +bl2\_platform\_setup(). Specifically, if support for multiple +boot sources is required, it initializes the boot sequence used by +plat\_try\_next\_boot\_source(). + +Function : plat\_try\_next\_boot\_source() [optional] +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +:: + Argument : void + Return : int + +This optional function passes to the next boot source in the redundancy +sequence. + +This function moves the current boot redundancy source to the next +element in the boot sequence. If there are no more boot sources then it +must return 0, otherwise it must return 1. The default implementation +of this always returns 0. + FWU Boot Loader Stage 2 (BL2U) ------------------------------ |