enabling pci for nvme boot

[aep]

would be nice if nvme boot was documented.

building the default image from git master doesnt appear to have pci enabled in uboot at all?

=> nvme scan
=>

=> pci
Scanning PCI devices on bus 0
BusDevFun  VendorId   DeviceId   Device Class       Sub-Class
_____________________________________________________________
=> 

this looks relevant

PCIe1: pcie@3400000 disabled
PCIe2: pcie@3500000 disabled
PCIe3: pcie@3600000 Root Complex: no link
PCIe4: pcie@3700000 disabled
PCIe5: pcie@3800000 Root Complex: x1 gen3
PCIe6: pcie@3900000 disabled

[aep]

linux seems to be unhappy about the m.2 slot as well:

[  133.829728] pcieport 0001:00:00.0: AER: PCIe Bus Error: severity=Corrected, type=Physical Layer, (Receiver ID)
[  133.839742] pcieport 0001:00:00.0: AER:   device [1957:8d80] error status/mask=00000001/00006000
[  133.848529] pcieport 0001:00:00.0: AER:    [ 0] RxErr   

using the x8 pcie slot instead fixes this, but i'm assuming uboot isnt configured to scan that

[aep]

Switching from a crucial to samsung made it work.

Leaving open just in case this is a hardware issue that should be investigated?

[laf0rge]

Just for the record: Samsung SSD 980 PRO NVMe M.2 (Model: MZ-V8P1T0) was detected fine by u-boot and Linux.