The following is the patch Olimex has applied on u-boot for the images that they build. It is meant to work for all hardware revisions of Lime2.
https://github.com/OLIMEX/OLINUXINO/blob/master/SOFTWARE/A20/A20-build-3.4.103-release-7/a20-phy_1000_100-dram.patch It does not seem suitable for non-Lime2 boards and may need changes to before it can be submitted upstream (or Debian). Thanks, -- Sunil
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