On Thu, 2015-02-26 at 14:21 +0000, Ben Hutchings wrote:

This reverts commit fd9af07c3404ac9ecbd0d859563360f51ce1ffde.

The hardware manual states that the frame error and multicast bits are
copied to bits 9:0 of RD0, not bits 25:16.  I've tested that this is
true for RFS1 (CRC error), RFS3 (frame too short), RFS4 (frame too
long) and RFS8 (multicast).

[...]

This behaviour might of course be dependent on the revision of the chip.
I didn't find a chip ID register in the manual, but I found the recent
patch "ARM: shmobile: Add function to get SoCs revision data for R-Car
Gen2".  With that patch, /proc/cpuinfo on my test system shows:

Hardware        : Generic R8A7790 (Flattened Device Tree)
Revision        : 0020
Serial          : 0000000000000000

Ben.