Perhaps any interesting things in this file ?
https://opensource.apple.com/source/bless/bless-37/README.BOOTING
New World machines (with OF 3.0+) support HFS+, ISO9660, and FAT. When
Mac OS X is installed on an HFS+ volume, BootX is typically placed
in the /System/Library/CoreServices directory, and given the HFS+
type attribute of 'tbxi'. Furthermore, the CoreServices folder is
"blessed", which means that it's directory ID (analogous to an inum
in FFS terminology) is recorded, in the HFS+ volume header.
The next two components of
boot-device are used to located the BootX secondary loader. The first
("\\") is a special syntax denoting the blessed system folder
mentioned above.
Because a
directory (and not a file) was specified, ":tbxi" is used to filter
entries that have the HFS+ type of 'tbxi'. If multiple files in the
directory have the same HFS+ type, the first one (in directory order)
is used, which is somewhat non-deterministic from the operating system
point of view, and is not necessarily the alphabetically first entry.
Also, we could
have avoided the filter mechanism and specified the path to BootX
directly. The following forms are all equivalent, and would occur
after the last comma in boot-device variable (assuming the path itself doesn't have commas itself):
\\:tbxi
\\BootX
\System\Library\CoreServices\:tbxi
\System\Library\CoreServices\BootX
Sysop: | Keyop |
---|---|
Location: | Huddersfield, West Yorkshire, UK |
Users: | 296 |
Nodes: | 16 (2 / 14) |
Uptime: | 77:45:58 |
Calls: | 6,658 |
Calls today: | 4 |
Files: | 12,203 |
Messages: | 5,332,838 |
Posted today: | 1 |