You need to edit the last line of 'syslinux.cfg' to point to your DOS image file: append initrd= E.g. in this case you will want the line to read: append initrd=/BOOT2880.IMG After booting the Mac to the rEFIt volume, you will eventually select "SeaFlash" from the menu selection.
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I also was unable to get the syslinux USB thumbdrive method to work w/ the EFI on my system. I found a variation to this solution that doesn't require any Windows / Bootcamp steps. The catch is that your secondary HDD needs to be setup as HFS+ w/ an MBR partitioning scheme, otherwise you'll have to reformat it as such before proceeding (obviously most people will have originally formatted their secondary drives as HFS+ w/ GUID). This step wasn't painful for me since this is a brand new setup... I just installed the M4 in original HDD bay ('lower') and a new 2.5" HDD in the ODD bay (using an OWC Data Doubler assembly). To create a bootable syslinux partition on the internal 2.5" HDD, use Disk Utility to create 3 paritions. Click "Options" and choose MBR. For partition 1, choose MS-DOS and for the size type "1" (GB) and hit enter (should go to 1.07GB). For partition 2, choose HFS+ and for size type "1" (GB) and hit enter. For parition 3, choose the remainder of the capacity (should be automatically set) and select HFS+. If you happened to have already had your volume setup as one parition of HFS+ using the MBR scheme, you can simply click the "+" button to add the two 1GB partitions to the end and you won't have to reformat your existing volume (it will just shrink by ~2GB assuming you have the available storage). Click apply. Now, download and mount rEFIt-Syslinux: rEFIt-Syslinux.dmg In Disk Utility, select the "Restore" tab from any view and then right-click on the mounted rEFIt volume and select "Set as Source". Right-click on the 1GB HFS+ parition on your HDD and select "Set as Destination". Select on the rEFIt volume and click the Restore button, then authenticate. Now right-click on the mounted Syslinux volume and select "Set as Source". Right-click on the 1GB DOS partition on your HDD and select "Set as Destination". Select on the Syslinux volume and click the Restore button, then authenticate. Now unmount the rEFIt-Syslinux.dmg. Next, mount the Crucial ISO and find the boot image file (*.IMG) inside CDROM/BOOT/ISOLINUX/ and copy it to the root of your Syslinux volume (that exists on the internal HDD). Edit the syslinux.cfg file to point to the name of your boot image file (e.g. BOOT2880.IMG). Finally, reboot your Mac while holding down the Option key and select rEFIt > Legacy Boot. Once prompted, select "SeaFlash" and hit enter... then wait for the Crucial boot image to load.
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