v2024.07-rc4 issues on VisionFive v2

[Minda Chen]

> 
> 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 at 13070000
> 	MMC:   mmc at 16010000: 0, mmc at 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 at 2b000000: Starfive PCIe bus probed.
> 	starfive_7110_pcie pcie at 2c000000: Starfive PCIe bus probed.
> 	In:    serial at 10000000
> 	Out:   serial at 10000000
> 	Err:   serial at 10000000
> 	Net:   eth0: ethernet at 16030000, eth1: ethernet at 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.

CC  Hal