U-Boot 2020.10 (Jun 29 2020 - 03:06:40 +0000)

DRAM:  7.7 GiB
RPI 4 Model B (0xd03114)
MMC:   mmcnr@7e300000: 1, emmc2@7e340000: 0
Loading Environment from FAT... ** No partition table - mmc 0 **
In:    serial
Out:   serial
Err:   serial
Net:   eth0: ethernet@7d580000
PCIe BRCM: link up, 5.0 Gbps x1 (SSC)
starting USB...
Bus xhci_pci: probe failed, error -110
No working controllers found
Hit any key to stop autoboot:  0
switch to partitions #0, OK
mmc0 is current device
** No partition table - mmc 0 **
[snip]

2711ZPKFSB06BOT
 vs.
2711ZPKFSB06C0T
is a major change in that there is a bunch of logic
special to the B0T variant to deal with a DMA limitation
of not being able to span the full address space. The
C0T variant has the hardware fixed and is not limited
to the lower 3 GiBytes. The RPi firmware likely configures
the C)T parts differently in various ways.