v2024.07-rc4 issues on VisionFive v2

[Conor Dooley]

Hey,

After going from Vendor SPL/OpenSBI/U-Boot to OpenSBI v1.4++ plus
v2024.07-rc4 SPL/U-Boot I ran into a boot loop problem relating to
PCI:
        U-Boot 2024.07-rc4 (Jun 13 2024 - 15:09:34 +0100)
        
        CPU:   sifive,u74-mc
        Model: StarFive VisionFive 2 v1.2A
        DRAM:  4 GiB
        Core:  136 devices, 26 uclasses, devicetree: board
        WDT:   Not starting watchdog@13070000
        MMC:   mmc@16010000: 0, mmc@16020000: 1
        Loading Environment from SPIFlash... SF: Detected gd25lq128 with page 
size 256 Bytes, erase size 4 KiB, total 16 MiB
        OK
        StarFive EEPROM format v2
        
        --------EEPROM INFO--------
        Vendor : StarFive Technology Co., Ltd.
        Product full SN: VF7110A1-2249-D004E000-00000540
        data version: 0x2
        PCB revision: 0xa1
        BOM revision: A
        Ethernet MAC0 address: 6c:cf:39:00:17:95
        Ethernet MAC1 address: 6c:cf:39:00:17:96
        --------EEPROM INFO--------
        
        starfive_7110_pcie pcie@2b000000: Starfive PCIe bus probed.
        starfive_7110_pcie pcie@2c000000: Starfive PCIe bus probed.
        In:    serial@10000000
        Out:   serial@10000000
        Err:   serial@10000000
        Net:   eth0: ethernet@16030000, eth1: ethernet@16040000
        starting USB...
        Bus xhci_pci: Register 5000420 NbrPorts 5
        Starting the controller
        USB XHCI 1.00
        scanning bus xhci_pci for devices... 
        U-Boot SPL 2024.07-rc4 (Jun 13 2024 - 15:09:34 +0100)
        DDR version: dc2e84f0.
        Trying to boot from SPI

This only appeared after I refreshed the environment by running.
`env default -a -f; env save`. Before that things worked "fine", I
suppose because nothing actually touched PCI. I've just disabled
PCI for now and things are working once more. I've not attempted
to bisect/debug this, cos that's not the fastest process while
running U-Boot out of flash.

In case it is relevant, the board I have is one of the "super early
bird" ones.

Cheers,
Conor.

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