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<a href="https://gitlab.rtems.org/kgardas">Karel Gardas</a>
<a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5110#note_110798">commented</a>:
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<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">Indeed, this is classical and well expected argument. Practice however shows that there is a single testcase from ~600 tests from RTEMS testsuite I compiled with and without the option which resulted in different binary completely. All others have the same text/bss/data sizes so assumption is do not differ or differ much. One different was tftpfs.</p>
<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">Anyway. AFIAK there is a no way how to decide if code is using FMC or it is not, besides looking into RTEMS configuration itself. E.g. once user set linkcmds.*sdram, then this is clear FMC is in use. On the other hand this is probably not easily detectable in ini itself....</p>
<p dir="auto" style="color: #333238; margin: 0;" align="initial">So would you like to have configure option like: <code style='font-size: 90%; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0; font-weight: inherit; font-family: var(--default-mono-font, "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;'>STM32H7_ERRATA_ENABLE_FMC_282 = False/True</code> in ini file which would drive addition of -mno-unaligned-access option? Fine by me, but what would be default? Here I would really appreciate <code style='font-size: 90%; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; font-family: var(--default-mono-font, "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;'>True</code> as this is about stability and even ST itself recommends that! Once someone feels a need to be brave, then she/he can switch to <code style='font-size: 90%; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; font-family: var(--default-mono-font, "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;'>False</code> of course, but he/she will/should understand consequences well.</p>
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