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<a href="https://gitlab.rtems.org/l1zard">Sameer Srivastava</a>
<a href="https://gitlab.rtems.org/groups/rtems/-/epics/22#note_122872">commented</a>:
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<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">from the Zephyr port so far I see these major steps to get to a REPL</p>
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<code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>mp_hal_init()</code> only initializes a signal called "wait_signal", not sure what's going on there</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">initialize micropython stack and heap</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">run <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>pyexec_friendly_repl()</code> in a loop</li>
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<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">this needs implementations for <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0; font-weight: inherit; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>mp_hal_stdout_tx_str</code> and <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>mp_hal_stdin_rx_chr</code></p>
<p dir="auto" style="color: #28272d; margin: 0;" align="initial">also mirrors what's mentioned in the <a href="https://docs.micropython.org/en/latest/develop/porting.html" rel="nofollow noreferrer noopener" target="_blank" style="margin-top: 0;">MicroPython docs on Porting</a></p>
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