[U-Boot] PCIe bridges on Jetson TK1

[Andreas Färber]

Hi,

When I boot my Jetson TK1, by default I get this from lspci:

00:02.0 PCI bridge: NVIDIA Corporation TegraK1 PCIe x1 Bridge (rev a1)
01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0c)

If however I plug some mini PCIe card, I get this instead:

00:01.0 PCI bridge: NVIDIA Corporation TegraK1 PCIe x4 Bridge (rev a1)
00:02.0 PCI bridge: NVIDIA Corporation TegraK1 PCIe x1 Bridge (rev a1)
01:00.0 Network controller: MEDIATEK Corp. Device 7612
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0c)

I.e., there is a new Tegra PCIe x4 bridge and the number of the previous
x1 bridge changed.

That is ugly because it changes the ID of the on-board PCI NIC from
01:00.0 to 02:00.0, which on openSUSE renames the network interface from
enp1s0 to enp2s0, so that my /etc/sysconfig/network/ifcfg-enp1s0 does
not take effect and the network interface doesn't come up.

Tested with U-Boot v2016.05 and v2016.07 and kernel 4.6.2 and 4.7-rc6.

Shouldn't U-Boot or the kernel driver always configure the PCIe ports
the same way (both bridges available) since the slot is always there on
this board?

Thanks,
Andreas

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