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Diffstat (limited to 'docs/firmware-design.md')
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diff --git a/docs/firmware-design.md b/docs/firmware-design.md index a40ddac5..76c27f72 100644 --- a/docs/firmware-design.md +++ b/docs/firmware-design.md @@ -219,6 +219,15 @@ access to access controlled components. On the Base FVP a TrustZone controller abstraction layer is initialized which is used to load further bootloader images. +#### BL3-0 (System Control Processor Firmware) image load + +Some systems have a separate System Control Processor (SCP) for power, clock, +reset and system control. BL2 loads the optional BL3-0 image from platform +storage into a platform-specific region of secure memory. The subsequent +handling of BL3-0 is platform specific. Typically the image is transferred into +SCP memory using a platform-specific protocol. The SCP executes BL3-0 and +signals to the Application Processor (AP) for BL2 execution to continue. + #### BL3-1 (EL3 Runtime Firmware) image load BL2 loads the BL3-1 image from platform storage into a platform-specific address |