Date: Fri, 23 Mar 2018 13:53:43 +0100 From: Maurizio Vairani <maurizio1018@gmail.com> To: Benno Rice <benno@freebsd.org> Cc: FreeBSD Current <freebsd-current@freebsd.org>, freebsd-hackers@freebsd.org Subject: Re: Testing requested: Hybrid ISO/USB boot Message-ID: <CAN0zgYWcrgbNdbF0jj829V7Q_SpVX54M2sMr=U0RN3wGaNekTg@mail.gmail.com> In-Reply-To: <D606FA1E-8E53-4D57-8A3C-2914B92385D6@FreeBSD.org> References: <D606FA1E-8E53-4D57-8A3C-2914B92385D6@FreeBSD.org>
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2018-03-22 19:06 GMT+01:00 Benno Rice <benno@freebsd.org>: > Hello all! > > I=E2=80=99ve been working on the ability to create hybrid ISO/HDD boot im= ages for > x86, a la what Linux systems do with ISOHYBRID. The general theory seems = to > be that ISO images have a 32KB hunk of zeroes at the front that they > generally ignore so we=E2=80=99ll stick something in there that can handl= e booting > if need be. The cases generally break down as follows: > > UEFI with CD: Boots using an EFI system partition embedded in the ISO > image. This loads loader, and so on. > UEFI with HDD: Same as above as UEFI doesn=E2=80=99t really care what the > underlying medium is and it sees the ISO image. > Legacy BIOS with CD: Boots using El Torrito as always. > > And now for the new part: > > Legacy BIOS with HDD: Sees a DOS MBR stuck in the 32KB at the front of th= e > ISO image. This MBR contains our MBR boot code, which sees an active BSD > slice containing a variant of our BSD boot code that reads from the ISO > filesystem instead of UFS. This finds loader in the ISO filesystem and > loads that. Loader has had support for reading ISO9660 images off HDDs > added. Everything continues normally after that. > > The review for these changes is here: > > https://reviews.freebsd.org/D14799 <https://reviews.freebsd.org/D14799>; > > And a version of the standard =E2=80=9Cbootonly=E2=80=9D ISO image built = with these > changes is here: > > https://people.freebsd.org/~benno/hybrid-bootonly.iso.xz < > https://people.freebsd.org/~benno/hybrid-bootonly.iso.xz>; > > I=E2=80=99ve tested this image under qemu and VMware under all four of th= e > BIOS/UEFI and CD/HDD combinations. I=E2=80=99ve also booted a system buil= d around > an Asus X399 Prime motherboard with this dd=E2=80=99ed to a USB stick. I= =E2=80=99d love > some testing on more systems, especially things that are more likely to > have more customized boot firmwares (I=E2=80=99m thinking Dell, HP, etc). > > Many thanks, > Benno. > _______________________________________________ > freebsd-current@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org= " > Hi Benno, thank you for your work. On a Mac mini "Core i5" 2.3 (Mid-2011), booting via USB, it hangs very early, after writing: FreeBSD/x86 bootstrap loader, version 1.1 (Wed Mar 21 10:27:48 PDT 2018 benno@bobthe) Regards, Maurizio
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