It seems mainline u-boot bootstrao all lime2 devices equally, whereas 
Olimex fork of u-boot treats "newer than G and "newer than E" specially: 
https://github.com/OLIMEX/u-boot/commit/6c32a3c9d31432884751966fcb0f15b1fd930446

  * Realtek rev.C PHY (board rev.C) get no tweak (but see bug#845128)
  * Realtek rev.E PHY (board rev.G,G1,G2) get TX_DELAY=2
  * Micrel PHY (board rev.H,K) get TX_DELAY=4

...as pointed out on irc up until here: 
https://freenode.irclog.whitequark.org/linux-sunxi/2019-04-25#24483567


 - Jonas

-- 
 * Jonas Smedegaard - idealist & Internet-arkitekt
 * Tlf.: +45 40843136  Website: http://dr.jones.dk/

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