I will add some information about UEFI implementation in our devices. 
The device exposes blockIO interface. In  UEFI  terminology the device 
registers BlockIO Protocol. 
However, the device doesn't belong to any standard UEFI storage  buses like 
ATA, SCSI or USB. It register as a LUN device in the Media Part of Device Path.
The typical Device  Path of our device would be following:

PciRoot (0X0)/Pci (0x1,0x0)/Pci (0x0,0x0) /Unit(0x0)/HD(1,GPT,<GUID>)

It doesn't do any special stuff in terms of UEFI implementaion.

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https://bugs.launchpad.net/bugs/1237519

Title:
  Grub2 fails to install to non-standard device path

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