{"id":61,"date":"2020-12-29T23:16:08","date_gmt":"2020-12-29T22:16:08","guid":{"rendered":"https:\/\/threedots.ovh\/blog\/?p=61"},"modified":"2020-12-30T18:01:07","modified_gmt":"2020-12-30T17:01:07","slug":"pcie-quirks-on-arm-systems-w-acpi","status":"publish","type":"post","link":"https:\/\/threedots.ovh\/blog\/2020\/12\/pcie-quirks-on-arm-systems-w-acpi\/","title":{"rendered":"PCIe quirks on Arm systems w\/ ACPI"},"content":{"rendered":"<p>Taking a look at the list of platforms which have quirks in drivers\/acpi\/<a href=\"https:\/\/elixir.bootlin.com\/linux\/latest\/source\/drivers\/acpi\/pci_mcfg.c#L146\">pci_mcfg.c<\/a>\u00a0for Arm today:<\/p>\n<ul>\n<li>AWS Graviton<\/li>\n<li>Qualcomm QDF2432<\/li>\n<li>HiSilicon HIP05\/06\/07<\/li>\n<li>Cavium ThunderX<\/li>\n<li>X-Gene v1<\/li>\n<li>X-Gene v2<\/li>\n<li>Ampere Altra (released this year!)<\/li>\n<\/ul>\n<p>What&#8217;s missing here? Any SoC for a platform present at a lower price point. And on why, read <a href=\"https:\/\/patchwork.kernel.org\/project\/linux-acpi\/patch\/20200103174935.5612-1-vidyas@nvidia.com\/\">https:\/\/patchwork.kernel.org\/project\/linux-acpi\/patch\/20200103174935.5612-1-vidyas@nvidia.com\/<\/a>\u00a0.<\/p>\n<p>It&#8217;s obvious in this case that Arm non-server platforms are *not* cared about, and this is perfectly nonsensical if the goal is to actually support those!<\/p>\n<p>And no, this platform is too new isn&#8217;t an excuse when even the\u00a0<em>Altra<\/em>, which only became available this year requires a PCIe erratum workaround. (notwithstanding the fact that Tegra Xavier platforms became available for purchase in 2018)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Taking a look at the list of platforms which have quirks in drivers\/acpi\/pci_mcfg.c\u00a0for Arm today: AWS Graviton Qualcomm QDF2432 HiSilicon HIP05\/06\/07 Cavium ThunderX X-Gene v1 X-Gene v2 Ampere Altra (released this year!) What&#8217;s missing here? Any SoC for a platform present at a lower price point. And on why, read https:\/\/patchwork.kernel.org\/project\/linux-acpi\/patch\/20200103174935.5612-1-vidyas@nvidia.com\/\u00a0. It&#8217;s obvious in this&hellip;&nbsp;<a href=\"https:\/\/threedots.ovh\/blog\/2020\/12\/pcie-quirks-on-arm-systems-w-acpi\/\" rel=\"bookmark\">Read More &raquo;<span class=\"screen-reader-text\">PCIe quirks on Arm systems w\/ ACPI<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[4],"tags":[],"class_list":["post-61","post","type-post","status-publish","format-standard","hentry","category-arm"],"_links":{"self":[{"href":"https:\/\/threedots.ovh\/blog\/wp-json\/wp\/v2\/posts\/61","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/threedots.ovh\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/threedots.ovh\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/threedots.ovh\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/threedots.ovh\/blog\/wp-json\/wp\/v2\/comments?post=61"}],"version-history":[{"count":2,"href":"https:\/\/threedots.ovh\/blog\/wp-json\/wp\/v2\/posts\/61\/revisions"}],"predecessor-version":[{"id":63,"href":"https:\/\/threedots.ovh\/blog\/wp-json\/wp\/v2\/posts\/61\/revisions\/63"}],"wp:attachment":[{"href":"https:\/\/threedots.ovh\/blog\/wp-json\/wp\/v2\/media?parent=61"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/threedots.ovh\/blog\/wp-json\/wp\/v2\/categories?post=61"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/threedots.ovh\/blog\/wp-json\/wp\/v2\/tags?post=61"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}