emmc tuning execution failed: -5

Unfortunately I'm struggling with getting a new 64Gb emmc module to work.
I have installed the latest firmware and everything is fine booting various distributions from USB. I can also use uboot to successfully write to the emmc via the USB A-to-A cable.
But both when booting from emmc, I get the message:
[    3.297076] mmc0: tuning execution failed: -5
[    3.297090] mmc0: error -5 whilst initialising MMC card
Then it hangs.
Booting from USB, the same message appears and the device is not accessible - no /dev/mmc* appear.
It could be a faulty emmc - or is there a tweak or patch I can try please?
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