I just did this:
- made an Intel Extended partition covering the whole HD using Haiku Alpha 4.1's DriveSetup
- made several BeOS partitions
- deleted the first one
- installed Haiku onto one of the other ones
- installed CentOS 6.4 i386 into the empty space, which created two partitions within the empty space, the first being 500 MB
- ran BootManager from Haiku and set up the menu to be able to boot to any partition
Now, when I boot, if I select Haiku, it boots fine. If I select either of the CentOS partitions, it says, "Not a bootable partition".
Did CentOS forget to install GRUB or something? Is this an issue with my CentOS setup, Haiku's BootManager, or with my use of Extended Intel partitions?
FWIW, I used to run PC-BSD, and IIRC Peppermint Linux also, on here using the same methodology--except for the Extended Intel part, because I only needed four partitions--and they would boot from Haiku's BootManager just fine.