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This commit updates the RISC-V debug spec-compliant debug implementation
by incorporating changes mostly done by Robert Balas on the RI5CY core.
Most notably, single stepping works after this patch is applied.
With this patch the RISC-V debug compliance test built into OpenOCD
passes fully.
This commit switches the ibex core from a custom debug system to an
execution-based, standard RISC-V debug system. The port is based on a
port done for the RI5CY core.
This change has been informed by advice from the lowRISC legal
committee.
The Solderpad 0.51 license states "the Licensor permits any Work
licensed under this License, at the option of the Licensee, to be
treated as licensed under the Apache License Version 2.0". We use this
freedom to convert license markings to Apache 2.0. This commit ensures
that we retain all authorship and copyright attribution information.
