I noticed that a "force master" workaround[1] was introduced into u-boot in 2016 after some discussion[2] for fixing poor Ethernet performance on RTL8211C found in Lime2 Rev.C. Later, perhaps inadvertently, this seems to be removed[3].
Links: 1) https://lists.denx.de/pipermail/u-boot/2016-March/249629.html 2) https://lists.denx.de/pipermail/u-boot/2016-March/248498.html 3) https://git.denx.de/?p=u-boot.git;a=blobdiff;f=configs/A20-OLinuXino-Lime2_defconfig;h=a4ade72d4a3a8029d6417e7658655d5e91aaa20f;hp=0d38f65c50e91493f6eb9c483fc816a18469e9c9;hb=8728c97eff5bd95f58320f886ae305f17931a374;hpb=c9592e3c5c97981787c0d82f768a6971deb4837d -- Sunil
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