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<p style="color: #777777;">
<a href="https://gitlab.rtems.org/wmthornton-dev">Wayne Thornton</a>
commented on a
discussion on <a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1193#note_150865">cpukit/dhrl/dhrl.c</a>:
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style="display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;">+<span class="line" data-lang="c">  <span class="n" style="color: #333333;">lowest_latency</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333333;">UINT64_MAX</span><span class="p">;</span></span>
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style="display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;">+<span class="line" data-lang="c">  <span class="n" style="color: #333333;">max_safe_bit</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #009999;">0</span><span class="p">;</span></span>
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style="display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;">+<span class="line" data-lang="c">    <span class="n" style="color: #333333;">max_safe_bit</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #445588; font-weight: 600;">uint8_t</span><span class="p">)</span> <span class="p">(</span> <span class="p">(</span> <span class="k" style="font-weight: 600;">sizeof</span><span class="p">(</span> <span class="kt" style="color: #445588; font-weight: 600;">unsigned</span> <span class="kt" style="color: #445588; font-weight: 600;">long</span> <span class="kt" style="color: #445588; font-weight: 600;">long</span> <span class="p">)</span> <span class="o" style="font-weight: 600;">*</span> <span class="mi" style="color: #009999;">8</span> <span class="o" style="font-weight: 600;">-</span> <span class="mi" style="color: #009999;">1</span> <span class="p">)</span> <span class="o" style="font-weight: 600;">-</span></span>
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<td class="new_line diff-line-num new" data-linenumber="241" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style="display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;">+<span class="line" data-lang="c">    <span class="s" style="color: #dd1144;">"</span><span class="se" style="color: #dd1144;">\n</span><span class="s" style="color: #dd1144;">Determining DDR Interleave Bit (Testing bits 6 to %u)...</span><span class="se" style="color: #dd1144;">\n</span><span class="s" style="color: #dd1144;">"</span><span class="p">,</span></span>
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<p dir="auto" style="color: #3a383f; margin: 0;" align="initial">While it's true that the debug macro is only used in this one function, I'd strongly prefer to keep it. Because <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">rtems_dhrl_calibrate_interleave</code> is empirically determining the memory topology at runtime, these debug prints are the only way an application developer can peek into that black box and see which hardware routing bit was actually selected. This is particularly useful if they want to run the calibration once during testing, read the output, and then hardcode that specific <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">interleave_bit</code> into their <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">rtems_dhrl_config</code> to save boot time later. Since it evaluates to a <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">no-op</code> when the debug flag is disabled, it shouldn't add any complexity to the final executable</p>
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