Chainloading GRUB from Win7
Yes, you read right.
Windows 7 has steadfastly refused all attempts to make it boot sucessfully by chainloading from GRUB to it, so now I'm going for the opposite way.
With Arch (finally) installed sucessfully, with it's own /boot and root partitions, I've used EasyBCD to create an entry in Windows' bootloader that points to Arch's /boot partition.
And nothing happens. Windows works fine, but it appears incapable of loading Arch from the /boot partition.
This might be because GRUB was installed to the MBR, found incapable of loading 7, and then re-overwritten with the Windows loader, so I'm guessing I may well need to reinstall GRUB, this time to the /boot partition (sda5) - except I haven't figured out how to do that with the pre-existing install.
In short: Arch is installed on sda6, with /boot on sda5. Entry created in Windows pointing to sda5 to boot, but nothing happens.