Hi All,
FYI - seems there is a patch to speed SATA performance:https://www.phoronix.com/scan.php?page=news_item&px=Faster-Allwinner-SATA-Patch (https://www.phoronix.com/scan.php?page=news_item&px=Faster-Allwinner-SATA-Patch)
There's a fairly lengthy discussion on the linux-sunxi ML which I suppose is what triggered that article.
It seems to work but more testing may be wise, as disk corruption might occur - seems OK with the values given but relying on them might be brave at this stage.
John