[U-Boot] db-88f6820-amc doesn't boot on latest u-boot/master

[Chris Packham]

Hi All,

I was just testing out the db-88f6820-amc on u-boot#master and found
that the SPL can't fetch then next stage from SPI.

U-Boot SPL 2019.04-rc2-00139-g91c56ed98da7 (Mar 01 2019 - 10:26:26 +1300)
High speed PHY - Version: 2.0
Detected Device ID 6820
board SerDes lanes topology details:
| Lane # | Speed | Type |
--------------------------------
| 0 | 5 | PCIe0 |
| 4 | 0 | SGMII1 |
| 5 | 0 | SGMII2 |
--------------------------------
PCIe, Idx 0: detected no link
High speed PHY - Ended Successfully
mv_ddr: mv_ddr-armada-18.09.2
DDR3 Training Sequence - Switching XBAR Window to FastPath Window
mv_ddr: completed successfully
Trying to boot from SPI SPI probe failed.
SPL: failed to boot from all boot devices
### ERROR ### Please RESET the board ###

I haven't had time to bisect this yet but I wondered if this was
related to the recent spi changes (this board uses SPI1 so maybe
that's the corner case). I may also potentially be fixed by the SPI
Kconfig series that is floating around on the list.