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as this only allows us to access file systems that EFI knows about.
With a loader that can only use EFI-supported file systems, we're
forced to put /boot on the EFI system partition. This is suboptimal
in the following ways:
1. With /boot a symlink to /efi/boot, mergemaster complains about
the mismatch and there's no quick solution.
2. The EFI loader can only boot a single version of FreeBSD. There's
no way to install multiple versions of FreeBSD and select one
at the loader prompt.
3. ZFS maintains /boot/zfs/zpool.cache and with /boot a symlink we
end up with the file on a MSDOS file system. ZFS does not have
proper handling of file systems that are under Giant.
Implement a disk device based on the block I/O protocol instead and
pull in file system code from libstand. The disk devices are really
the partitions that EFI knows about.
This change is backward compatible.
MFC after: 1 week
21 lines
980 B
Plaintext
21 lines
980 B
Plaintext
$FreeBSD$
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NOTE ANY CHANGES YOU MAKE TO THE BOOTBLOCKS HERE. The format of this
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file is important. Make sure the current version number is on line 6.
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2.0: Provide devices based on the block I/O protocol, rather than the
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simple file services protocol. Use the FreeBSD file system code
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on top of those devices to access files.
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1.2: Restructured. Has some user visible differences.
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1.1: Pass the HCDP table address to the kernel via bootinfo if one
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is present in the EFI system table.
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1.0: Don't map the I/O port range. We expect the kernel to do it. It
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was done in the loader as a debugging aid and not intended as a
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service/feature.
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0.3: Pass the physical address of the bootinfo block in register r8
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to the kernel. Continue to put it at the fixed address for now.
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0.2: Much improved version. Significant is the support for passing
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the FPSWA interface pointer to the kernel.
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0.1: Initial EFI version, germinated from the NetBSD i386
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standalone, but enormously modified.
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