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mention address of BootROM and first instruction

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Howard Mao
2019-09-10 11:10:00 -07:00
parent 200fec07e6
commit c6f6b2e117
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docs/Customization/Boot-Process.rst
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@@ -10,6 +10,9 @@ BootROM and RISC-V Frontend Server
The first instructions to run when the SoC is powered on are those stored in The first instructions to run when the SoC is powered on are those stored in
the BootROM. The assembly for the BootROM code is located in the BootROM. The assembly for the BootROM code is located in
`generators/testchipip/src/main/resources/testchipip/bootrom/bootrom.S <https://github.com/ucb-bar/testchipip/blob/master/src/main/resources/testchipip/bootrom/bootrom.S>`_. `generators/testchipip/src/main/resources/testchipip/bootrom/bootrom.S <https://github.com/ucb-bar/testchipip/blob/master/src/main/resources/testchipip/bootrom/bootrom.S>`_.
The BootROM address space starts at ``0x10000`` and execution starts at address
``0x10040``, which is marked by the ``_hang`` label in the BootROM assembly.
The Chisel generator encodes the assembled instructions into the BootROM The Chisel generator encodes the assembled instructions into the BootROM
hardware at elaboration time, so if you want to change the BootROM code, you hardware at elaboration time, so if you want to change the BootROM code, you
will need to run ``make`` in the bootrom directory and then regenerate the will need to run ``make`` in the bootrom directory and then regenerate the