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Issue created by <a href="https://gitlab.rtems.org/sebhub">Sebastian Huber</a>: <a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5744">#5744</a>
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<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">The psim BSP maps 256 MiB of RAM with DBAT0. The PCI BAT starts at
<code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0px; 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;">0x08000000</code>, which lies inside that range. <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;">setdbat()</code> rejects an overlap, so
it prints "BATs must not overlap" at every boot and leaves the register
unprogrammed. The simulator has no PCI bus and the device tree declares no
device at that address.</p>
<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">The fast idle loop of the decrementer driver moves the time base forward while
the idle thread is the executing thread and the heir. It has no other exit. A
test which gives the idle thread a priority above a ready task therefore keeps
the processor in the clock interrupt and no thread runs again. <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0px; 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;">ts-userext</code> on
psim stops at its last action. The shared loop of <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;">clockimpl.h</code> has the exit
which this one lacks.</p>
<p dir="auto" style="color: #3a383f; margin: 0px;" align="initial">Found while running the test suite of the BSP on the simulator. This
description was created with Claude Code assistance.</p>
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