[OpenBIOS] About HFS+ support
mark.cave-ayland at ilande.co.uk
Mon Oct 15 14:00:53 CEST 2012
On 13/10/12 06:37, Segher Boessenkool wrote:
> On a Mac-partitioned disk, there is no such thing as a "system
> partition" (that is a DOS thing).
> Apple OF looks at the partition types (which are strings), and
> uses the first one that is "Apple_Boot", "Apple_HFS", or "DOS_FAT_",
> if you do not give a partition number (or partition # 0).
Oh that's interesting. Perhaps the reason I'm getting distracted is by
looking at the partition flags #defines in the code:
kPartitionAUXIsValid = 0x00000001,
kPartitionAUXIsAllocated = 0x00000002,
kPartitionAUXIsInUse = 0x00000004,
kPartitionAUXIsBootValid = 0x00000008,
kPartitionAUXIsReadable = 0x00000010,
kPartitionAUXIsWriteable = 0x00000020,
kPartitionAUXIsBootCodePositionIndependent = 0x00000040,
kPartitionISMountedAtStartup = 0x40000000,
kPartitionIsStartup = 0x80000000,
kPartitionIsChainCompatible = 0x00000100,
kPartitionIsRealDeviceDriver = 0x00000200,
kPartitionCanChainToNext = 0x00000400,
This would in itself suggest that kPartitionAUXIsBootValid or
kPartitionIsStartup would be good indicators of which partition to
choose. Unfortunately I don't have any PPC OS X images or much Apple
experience, so guesswork is all I have at the moment.
Do you have a source for your algorithm above?
> FWIW, it normally boots "hd:,\\:tbxi" which means the disk with
> alias "hd", potentially some partition on that, in the blessed
> folder ("\\"), the file with any creator and file type "tbxi"
> (which is a bootinfo file) (":tbxi").
Yes, I believe this is currently what happens when attempting a boot.
> I don't think you want to recreate all the logic (and lack of it!)
> behind how Macs boot.
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