Date: Tue, 16 Sep 2014 19:19:32 -0400 From: Ed Maste <emaste@freebsd.org> To: "O. Hartmann" <ohartman@zedat.fu-berlin.de> Cc: FreeBSD Current <freebsd-current@freebsd.org>, Nathan Whitehorn <nwhitehorn@freebsd.org>, Allan Jude <allanjude@freebsd.org> Subject: Re: CURRENT: EFI boot failure Message-ID: <CAPyFy2C03AxTnQ_zoKkXEfyGqAQ4q_FBSwdk47qCfOzPQTDp=w@mail.gmail.com> In-Reply-To: <20140917002524.5852fe14.ohartman@zedat.fu-berlin.de> References: <20140916020541.03c18d04.ohartman@zedat.fu-berlin.de> <54178607.1060305@freebsd.org> <541786BE.6010105@freebsd.org> <20140916075121.29989a53.ohartman@zedat.fu-berlin.de> <5417E20D.8070607@freebsd.org> <20140916230348.189e80cd.ohartman@zedat.fu-berlin.de> <CAPyFy2AicKf-PWGDnq80Zmm8ukwTkURZm8RRUFxdfHK=Xd7XAQ@mail.gmail.com> <20140917002524.5852fe14.ohartman@zedat.fu-berlin.de>
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On 16 September 2014 18:25, O. Hartmann <ohartman@zedat.fu-berlin.de> wrote: > > Besides, checking both boot1.efi and loader.efi with file() shows something like > loader.efi: PE32+ executable (EFI application) x86-64 (stripped to external PDB), for MS > Windows. So both are PECOFF format files? That is correct. >> >> boot1.efifat is a FAT filesystem image that contains a copy of >> boot1.efi as /EFI/BOOT/BOOTX64.EFI. It exists so that the installer >> can treat it as opaque bootcode, like other boot schemes. It's >> certainly possible to create a partition, use newfs_msdos to format >> it, and copy in boot1.efi instead. > > All right, here you lost me ... sorry. The partition created by the installes with type > "efi" is then the /EFI/ partition, which then contains a folder BOOT and in which the > boot1.efi is located? > As I understand, I can manually mount this partition as FAT and copy boot1.efi as > BOOTX64.EFI into it? This knowledge could come in handy if something goes very bad. Sorry, not quite; an ESP is a separate partition formatted with FAT. The file system in that partition has EFI/ in the root directory, BOOT/ under that, and BOOTX64.EFI in there. We don't (yet) mount the ESP inside of FreeBSD by default. At least some Linuxes do mount the ESP at /boot/efi, so you end up with /boot/efi/EFI/BOOT/BOOTX64.EFI. We might start doing something similar when fleshing out dual-boot configuration support. boot1.efifat is a copy (image) of the ESP, as it exists on the disk. You can see what's inside: # mdconfig -a -f /boot/boot1.efifat md0 # mount_msdosfs /dev/md0 /mnt # ls -l /mnt/efi/boot/BOOTx64.efi -rwxr-xr-x 1 root wheel 65536 Apr 26 20:43 /mnt/efi/boot/BOOTx64.efi # umount /mnt # mdconfig -d -u 0
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