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[rtl] Add support for direct mode in mtvec #2044

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[rtl] Add support for direct mode in mtvec #2044

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Commits on May 31, 2023

  1. [rtl] Add support for direct mode in mtvec 

    The Ibex RISC-V core currently lacks support for the direct mode in the
mtvec (lowRISC#1419). This commit make mtvec support both vectored and direct
mode.

To ensure compatibility with existing test programs, the initial value
of mtvec.MODE is set to vectored mode.For both vectored mode and direct
mode, mtvec.BASE must be 256-byte aligned.
    @leesum1
    leesum1 committed May 31, 2023
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