i.MX8M Mini Hangs at ATF when booting from USB

[Adam Ford]

I have a situation where the same Flash.bin file can boot an MMC card,
but hang when booting over USB.

In both cases, I can see the FIT file is loaded, and the various items
are identified and placed in their respective folders memory
locations.  The only difference I can see is that when jumping to
0x920000 (ATF), the USB booting hangs and ATF doesn't appear to
execute.  Is there some special command that I need to issue to unlock
this memory to execute from it when booting from USB?  I am calling
enable_tzc380 from SPL, and I read the first 100 bytes and last 100
bytes and compared it to my bl31.bin file, and it appears to match, so
I know I can read from it.

U-Boot SPL 2022.01-00836-g3cc200c91a-dirty (Jan 30 2022 - 07:31:51 -0600)
No pmic
WDT:   Not starting watchdog at 30280000
Trying to boot from USB SDP
USB EHCI 1.00
SDP: initialize...
SDP: handle requests...
Downloading file of size 832080 to 0x40400000... done
Jumping to header at 0x40400000
Header Tag is not an IMX image
Found header at 0x40417c00
firmware: 'uboot'
External data: dst=40200000, offset=3000, size=9ddd8
fdt: 'fdt-1'
External data: dst=4029de00, offset=aaea0, size=87b0
loadables: 'atf'
External data: dst=920000, offset=a0dd8, size=a0c6
image entry point: 0x920000

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