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This patch adds the macro BSP_START_NEEDS_REGISTER_INITIALIZATION and
three hooks for BSP-specific register init code to arm/shared/start.S.
Said hooks are bsp_start_init_registers_core (intended for initializing
the ARM core registers), bsp_start_init_registers_banked_fiq (for the
FIQ mode banked registers) and bsp_start_init_registers_vfp (for the FPU
registers). BSP_START_NEEDS_REGISTER_INITIALIZATION would be defined in
a BSP's configure.ac (so that it appears in its bspopts.h).
This patch also adds the register init code required by the TMS570.
We've tested it with the tms570ls3137_hdk.cfg config and it works fine.
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