[Bug 255080] U-Boot build for Raspberry Pi 4 (arm64) does not boot from MicroSD card slot

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255080

            Bug ID: 255080
           Summary: U-Boot build for Raspberry Pi 4 (arm64) does not boot
                    from MicroSD card slot
           Product: Base System
           Version: 13.0-STABLE
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: arm
          Assignee: freebsd-arm at FreeBSD.org
          Reporter: ttkdroid at gmail.com

TEST SCENARIO

1. Flashed the image FreeBSD-13.0-RELEASE-arm64-aarch64-RPI.img.xz in MicroSD
using dd on MacOS
2. Inserted flashed MicroSD on RaspberryPi 4 slot
3. U-Boot fails to find the MicroSD
4. U-Boot then looks for USB storage but can't find it
5. U-Boot then try to boot from network
6. Same MicroSD card is inserted in a MicroSD-USB adapter and inserted on
Raspberry  Pi USB Port
7. FreedBSD boots OK

OBSERVATIONS
1: The U-Boot build doesn't include the command 'sdboot' thus it was not
possible to manually force the boot from the MicroSD card slot
2: The U-Boot "boot_targets" has "mmc" defined
3. It switches to "mmc0" which I assume is the MicroSD card but complains "**
No partition table -  mmc 0 **" and then switch to network boot

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