Date: Wed, 19 Sep 2018 08:31:40 -0700 (PDT) From: "Rodney W. Grimes" <freebsd-rwg@pdx.rh.CN85.dnsmgr.net> To: Greg V <greg@unrelenting.technology> Cc: Rebecca Cran <rebecca@bluestop.org>, Konstantin Belousov <kostikbel@gmail.com>, Warner Losh <imp@bsdimp.com>, FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: FreeBSD EFI projects Message-ID: <201809191531.w8JFVeDN024426@pdx.rh.CN85.dnsmgr.net> In-Reply-To: <1537370238.5568.2@hraggstad.unrelenting.technology>
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> On Wed, Sep 19, 2018 at 6:06 PM, Rodney W. Grimes > <freebsd-rwg@pdx.rh.CN85.dnsmgr.net> wrote: > >> On Wed, Sep 19, 2018 at 5:34 PM, Rodney W. Grimes > >> <freebsd-rwg@pdx.rh.CN85.dnsmgr.net> wrote: > >> >> On 9/18/18 4:11 AM, Greg V wrote: > >> >> > >> >> > > >> >> > I can confirm that the kernel already worked fine when booted > >> from > >> >> > 32-bit EFI. > >> >> > > >> >> > I booted an old Mac into HardenedBSD using a 32-bit-EFI build > >> of > >> >> GRUB2 :) > >> >> > >> >> > >> >> Was that a 64-bit version of FreeBSD? My understanding is the > >> 32-bit > >> >> FreeBSD boots fine, but 64-bit needs work. > >> > > >> > You would be hard pressed to find a system with a 64 bit CPU that > >> > could run 64 bit FreeBSD that had a 32 bit EFI implementation. > >> > >> Mac mini 2006 with a Core2Duo instead of the stock CoreDuo (and the > >> 2007 model's firmware flashed, but I don't think that impacts > >> FreeBSD). > > > > Yes, that is one of the catagories of rare, a EFI-32 bit system that > > was originally shipped with a 32 bit only CPU, that later got upgraded > > in the field with a 64 bit CPU, that still runs a EFI-32 bios. > > Are you sure the 2007 firmware is EFI32? I would of thought > > since they upgraded the base system to a 64 bit CPU they would > > of shipped it with a EFI-64 bios. > > The EFI firmware is technically 64 bit? but it only boots 32-bit > binaries. > > https://everymac.com/mac-answers/snow-leopard-mac-os-x-faq/mac-os-x-snow-leopard-64-bit-macs-64-bit-efi-boot-in-64-bit-mode.html > 'Furthermore, it appears that although subsequently released MacBook, > MacBook Air, and pre-"Mid-2010" Mac mini models all are equipped with > "Core 2 Duo" 64-bit processors and 64-bit EFIs, Apple has blocked these > "consumer-targeted" Macs from booting in 64-bit mode. iMac and MacBook > Pro models released in 2007 with 64-bit EFIs seem to have been blocked > as well.' That is not EFI32, so that is not a test case for how FreeBSD boots on EFI32 systems. That is a restriction apple artificially placed in the implementation. > >> And probably just the 2007 model as well :) > >> > >> Also, IIRC there were some Intel Atom tablets with 32-bit EFI. > > > > Atom N2xx and Z5xx series Atom models cannot run x86-64 > > Atom Z3740 ? "Instruction Set: 64-bit" > https://ark.intel.com/products/76759/Intel-Atom-Processor-Z3740-2M-Cache-up-to-1_86-GHz The above does not say Atom Z3xxx. If you find a Atom N2xx or Z5xx based system it most certainly has a EFI32. > > The tablet in question: ASUS VivoTab Note 8 (M80TA) > https://www.asus.com/us/Tablets/ASUS_VivoTab_Note_8_M80TA/ I can not find enough detail to know for certain that tablet actually has which version of EFI. You are saying it has EFI32? And if so based on what information? -- Rod Grimes rgrimes@freebsd.org
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