Refactored merger#27

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schirice wants to merge 13 commits intomasterfrom

Commits on May 4, 2021

* Enable interrupts, set up the mtvec, and print a simple
schirice
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Commits on Jun 16, 2021

* Add support for UART2, which is the transport uart used by the
schirice
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Commits on Jul 13, 2021

* Added support for the transport UART.
schirice
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Commits on Jul 22, 2021

* Updated the Makefiles to include the $ISP_PREFIX/soc_cfg
schirice
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Commits on Jul 23, 2021

Commits on Sep 7, 2021