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<a href="https://gitlab.rtems.org/zhugengyu2023">geng zhu</a> created an issue: <a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5237">#5237</a>
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<li style="margin-top: 0; line-height: 1.6em; margin-left: 25px; padding-left: 3px;">As refer to Bare-metal Boot Code for ARMv8-A Processors
Application Note 527 (<a href="https://developer.arm.com/documentation/dai0527/latest/)%EF%BC%8Cafter" rel="nofollow noreferrer noopener" target="_blank" style="margin-top: 0;">https://developer.arm.com/documentation/dai0527/latest/)，after</a> enable mmu, DSB/ISB should exists for coherency, but the aarch64_mmu_enable now not have, which cause failure when clear bss in my board</li>
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<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial"><a class="no-attachment-icon gfm" href="https://gitlab.rtems.org/-/project/26/uploads/70d386af31a81d4cb09f72e6c7d44624/image.png" target="_blank" rel="noopener noreferrer" data-canonical-src="/uploads/70d386af31a81d4cb09f72e6c7d44624/image.png" data-link="true" style="margin-top: 0;"><img src="https://gitlab.rtems.org/-/project/26/uploads/70d386af31a81d4cb09f72e6c7d44624/image.png" alt="image" width="819" height="557" data-canonical-src="/uploads/70d386af31a81d4cb09f72e6c7d44624/image.png" class="gfm" style="max-width: 100%; height: auto; object-fit: contain; object-position: top; margin: 0 0 8px;"></a></p>
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<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #28272d; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; white-space: pre; 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; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">BSP_START_TEXT_SECTION static inline void</span>
<span id="LC2" class="line" lang="plaintext">aarch64_mmu_enable( const aarch64_mmu_control *control )</span>
<span id="LC3" class="line" lang="plaintext">{</span>
<span id="LC4" class="line" lang="plaintext"> uint64_t sctlr;</span>
<span id="LC5" class="line" lang="plaintext"></span>
<span id="LC6" class="line" lang="plaintext"> /* CPUECTLR_EL1.SMPEN is already set on ZynqMP and is not writable */</span>
<span id="LC7" class="line" lang="plaintext"></span>
<span id="LC8" class="line" lang="plaintext"> /* Flush and invalidate cache */</span>
<span id="LC9" class="line" lang="plaintext"> rtems_cache_flush_entire_data();</span>
<span id="LC10" class="line" lang="plaintext"></span>
<span id="LC11" class="line" lang="plaintext"> _AArch64_Write_ttbr0_el1( (uintptr_t) control->ttb );</span>
<span id="LC12" class="line" lang="plaintext"> _AARCH64_Instruction_synchronization_barrier();</span>
<span id="LC13" class="line" lang="plaintext"></span>
<span id="LC14" class="line" lang="plaintext"> /* Enable MMU and cache */</span>
<span id="LC15" class="line" lang="plaintext"> sctlr = _AArch64_Read_sctlr_el1();</span>
<span id="LC16" class="line" lang="plaintext"> sctlr |= AARCH64_SCTLR_EL1_I | AARCH64_SCTLR_EL1_C | AARCH64_SCTLR_EL1_M;</span>
<span id="LC17" class="line" lang="plaintext"> _AArch64_Write_sctlr_el1( sctlr );</span>
<span id="LC18" class="line" lang="plaintext"></span>
<span id="LC19" class="line" lang="plaintext"> /* Sync here */</span>
<span id="LC20" class="line" lang="plaintext"> _AARCH64_Data_synchronization_barrier();</span>
<span id="LC21" class="line" lang="plaintext"> _AARCH64_Instruction_synchronization_barrier();</span>
<span id="LC22" class="line" lang="plaintext">}</span></code></pre>
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