From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Return-Path: To: Bjorn Helgaas cc: linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org, Mika Westerberg , "Rafael J. Wysocki" From: Wolfgang Denk Subject: Re: PCIe x4 cards not detected on Z370 mainboards MIME-Version: 1.0 Content-type: text/plain; charset=UTF-8 In-reply-to: <20180326135235.GA221217@bhelgaas-glaptop.roam.corp.google.com> References: <20180322184840.E31D4247251@gemini.denx.de> <20180322192759.GA252023@bhelgaas-glaptop.roam.corp.google.com> <20180323084855.E3EAF247251@gemini.denx.de> <20180324044716.GF210003@bhelgaas-glaptop.roam.corp.google.com> <20180324201534.092D2247245@gemini.denx.de> <20180326135107.GH210003@bhelgaas-glaptop.roam.corp.google.com> <20180326135235.GA221217@bhelgaas-glaptop.roam.corp.google.com> Date: Mon, 26 Mar 2018 17:12:52 +0200 Message-Id: <20180326151252.B7C8F2476FF@gemini.denx.de> List-ID: Dear Bjorn, In message <20180326135235.GA221217@bhelgaas-glaptop.roam.corp.google.com> you wrote: > > P.S. https://en.wikipedia.org/wiki/Unified_Extensible_Firmware_Interface > has a little interesting background on UEFI/CSM. Thanks for the pointer. I start wondering if the mainboard / BIOS vendors stop supporting such older hardware, if such support could be re-added in Linux? OK, obviously not for the boot device, but... In U-Boot we have an x86 emulator to be able to initialize the on-board BIOS on (at least some) graphics cards so you can use these on ARM or Power architecture systems. Do we really have to add similar stuff to Linux to support legacy hardware? Would that even work? Best regards, Wolfgang Denk -- DENX Software Engineering GmbH, Managing Director: Wolfgang Denk HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de "I didn't know it was impossible when I did it."