Hi, I have been playing with grub gptsync, on apple intel mac with GUID partitioned 8 GB usb stick, 8 partitions. #1 is the standard fat32 EFI system part for macs.
I am comparing with the gptsync utility from linux, or rEFIt gptsync, currently used for macs booting pc-bios bootloader. It is working to allow selection of GPT partions for MBR 2, 3, 4 but some of the numbers look wrong. I have not tried setting flags. grub gptsync is not handling MBR partition table 1 the same way as current linux or refit gptsync, which puts GPT partition 1 (EFI system FAT32) in MBR part1. GPT Partions are (512 byte sectors) Current GPT partition table: # Start LBA End LBA Type 1 40 409639 EFI System (FAT) 2 409640 2395367 Mac OS X HFS+ 3 2395368 4573255 Mac OS X HFS+ 4 4835400 7141399 Mac OS X HFS+ 5 7403544 9965767 Mac OS X HFS+ 6 10227912 13046359 Mac OS X HFS+ 7 13308504 15642623 Mac OS X HFS+ 8 15904768 15949783 Mac OS X HFS+ There seems to be agreement about start and end on MBR table partitions 2 3 4, using grub> gptsync (hd0) 2 3 4. Other bytes differ (type, flags). This is after grub> gptsync (hd0) 2 3 4 (MBR part1 was initially set by linux gptsync) p...@im81:~$ sudo hexdump -Cn80 -s432 /dev/sdb [sudo] password for pxw: 000001b0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| 000001c0 02 00 ee 7f 0e 19 01 00 00 00 27 40 06 00 00 7f |..........'@....| 000001d0 0f 19 83 1a 2d 95 28 40 06 00 c0 4c 1e 00 00 1a |....-.(@...L....| 000001e0 2e 95 83 ab 57 1c e8 8c 24 00 60 3b 21 00 00 fc |....W...$.`;!...| 000001f0 59 2c 83 87 63 bc 48 c8 49 00 d0 2f 23 00 55 aa |Y,..c.H.I../#.U.| 00000200 Then as seen in linux gptsync, Current MBR partition table: # A Start LBA End LBA Type 1 1 409639 ee EFI Protective 2 409640 2395367 83 Linux 3 2395368 4573255 83 Linux 4 4835400 7141399 83 Linux Status: MBR table must be updated. Proposed new MBR partition table: # A Start LBA End LBA Type 1 1 409639 ee EFI Protective 2 * 409640 2395367 af Mac OS X HFS+ 3 2395368 4573255 af Mac OS X HFS+ 4 4835400 7141399 af Mac OS X HFS+ May I update the MBR as printed above? [y/N] y Yes p...@im81:~$ sudo hexdump -Cn80 -s432 /dev/sdb 000001b0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fe |................| 000001c0 ff ff ee fe ff ff 01 00 00 00 27 40 06 00 80 fe |..........'@....| 000001d0 ff ff af fe ff ff 28 40 06 00 c0 4c 1e 00 00 fe |......(@...L....| 000001e0 ff ff af fe ff ff e8 8c 24 00 60 3b 21 00 00 fe |........$.`;!...| 000001f0 ff ff af fe ff ff 48 c8 49 00 d0 2f 23 00 55 aa |......H.I../#.U.| 00000200 -- Cros (pxw)
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