raspi3-tutorial/01_bareminimum/start.S

/*
 * Copyright (C) 2018 bzt (bztsrc@github)
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 * of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
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.section ".text.boot"

.global _start

_start:
1:  wfe
    b       1b