Younas, Why are you still working on CMOS in now UEFI world? Detailed answer is in below.
Thanks/Ray > -----Original Message----- > From: edk2-devel <edk2-devel-boun...@lists.01.org> On Behalf Of > mohammadyounaskha...@dell.com > Sent: Thursday, August 16, 2018 12:44 PM > To: edk2-devel@lists.01.org > Subject: Re: [edk2] Question regarding CMOS regions. > > Hi Guys, > > Please help to reply to my below queries. > > Thank you, > Younas. > > -----Original Message----- > From: edk2-devel [mailto:edk2-devel-boun...@lists.01.org] On Behalf Of > Pathan, MohammadYounasKhan > Sent: Tuesday, August 14, 2018 9:17 AM > To: edk2-devel@lists.01.org > Subject: [edk2] FW: Question regarding CMOS regions. > > Hi All, > > As we know CMOS data can be 128 or 256 bytes. CMOS lower 128 bytes are > stored in IO ports 0x70-0x71 whereas CMOS upper 128 bytes are stored using IO > ports 0x72-0x73. > > 1. How to know that the system has 128bytes of CMOS or 256 bytes of CMOS > region? You could read the data to know whether high 128 bytes are valid or not. > 2. Is there any CMOS location which represents CMOS upper region is exists > or > valid or any other mechanism for it? Refer to #1. > 3. Are we replicating lower 128 bytes to upper 128 bytes in CMOS location > 0x70-0x71 (or 0x72-0x73)? If yes, Why are we doing that? It depends on BIOS implementation. I don't see any bios is duplicating the contents. > > Thank you, > Younas. > _______________________________________________ > edk2-devel mailing list > edk2-devel@lists.01.org > https://lists.01.org/mailman/listinfo/edk2-devel > _______________________________________________ > edk2-devel mailing list > edk2-devel@lists.01.org > https://lists.01.org/mailman/listinfo/edk2-devel _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
