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minibar: various PCIe updates#457

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aaron/mb-pcie
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minibar: various PCIe updates#457
Aaron-Hartwig wants to merge 1 commit intomainfrom
aaron/mb-pcie

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@Aaron-Hartwig
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  • default PCIe power rails to off
  • keep PERST asserted when no sled is attached
  • add a way for software to override PERST (no need currently, just in case)
  • make sure PERST respects t_pvperl

fixes #455

@Aaron-Hartwig Aaron-Hartwig self-assigned this Jan 28, 2026
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minibar: improve PERST design

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