Flashing eMMC

  *** U-Boot Boot Menu ***

     Boot
     Boot USB
     Boot PXE
     Boot DHCP
     EtherealOS
     eMMC USB Drive Mode
     fastboot USB Mode
     Reboot
     U-Boot console


  Press UP/DOWN to move, ENTER to select

[ 4596.518464] usb 1-3.1.3: new high-speed USB device number 13 using xhci_hcd
[ 4596.518975] usb 1-3.1.3: Device not responding to setup address.
[ 4601.862350] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command
[ 4602.070255] usb 1-3.1.3: device not accepting address 13, error -62
[ 4602.150301] usb 1-3.1.3: new high-speed USB device number 14 using xhci_hcd
[ 4602.171132] usb 1-3.1.3: New USB device found, idVendor=1b8e, idProduct=fada, bcdDevice=99.99
[ 4602.171137] usb 1-3.1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 4602.171141] usb 1-3.1.3: Product: USB download gadget
[ 4602.171143] usb 1-3.1.3: Manufacturer: Libre Computer
[ 4602.191318] usb-storage 1-3.1.3:1.0: USB Mass Storage device detected
[ 4602.191398] scsi host6: usb-storage 1-3.1.3:1.0
[ 4602.191474] usbcore: registered new interface driver usb-storage
[ 4602.193266] usbcore: registered new interface driver uas
[ 4603.207018] scsi 6:0:0:0: Direct-Access     Linux    UMS disk 0       ffff PQ: 0 ANSI: 2
[ 4603.207691] sd 6:0:0:0: Attached scsi generic sg4 type 0
[ 4603.207947] sd 6:0:0:0: [sdd] 15269888 512-byte logical blocks: (7.82 GB/7.28 GiB)
[ 4603.208083] sd 6:0:0:0: [sdd] Write Protect is off
[ 4603.208086] sd 6:0:0:0: [sdd] Mode Sense: 0f 00 00 00
[ 4603.208220] sd 6:0:0:0: [sdd] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[ 4603.254568]  sdd: sdd1 sdd2 sdd3
[ 4603.257066] sd 6:0:0:0: [sdd] Attached SCSI removable disk
[ 4603.890176] raid6: avx2x4   gen() 25717 MB/s
[ 4603.958192] raid6: avx2x4   xor() 23047 MB/s
[ 4604.026173] raid6: avx2x2   gen() 33244 MB/s
[ 4604.094172] raid6: avx2x2   xor() 20945 MB/s
[ 4604.162171] raid6: avx2x1   gen() 26565 MB/s
[ 4604.230172] raid6: avx2x1   xor() 17171 MB/s
[ 4604.298170] raid6: sse2x4   gen() 16131 MB/s
[ 4604.366168] raid6: sse2x4   xor()  9875 MB/s
[ 4604.434162] raid6: sse2x2   gen() 13565 MB/s
[ 4604.502176] raid6: sse2x2   xor()  9267 MB/s
[ 4604.570163] raid6: sse2x1   gen() 12410 MB/s
[ 4604.638161] raid6: sse2x1   xor()  6949 MB/s
[ 4604.638162] raid6: using algorithm avx2x2 gen() 33244 MB/s
[ 4604.638162] raid6: .... xor() 20945 MB/s, rmw enabled
[ 4604.638163] raid6: using avx2x2 recovery algorithm
[ 4604.644765] xor: automatically using best checksumming function   avx
[ 4604.693549] Btrfs loaded, crc32c=crc32c-intel
[ 4604.695235] BTRFS: device label SYSTEM devid 1 transid 665 /dev/sdd2 scanned by systemd-udevd (8651)
[ 4604.849219] BTRFS info (device sdd2): disk space caching is enabled
[ 4604.849264] BTRFS info (device sdd2): has skinny extents
[ 4604.896235] BTRFS info (device sdd2): checking UUID tree

sudo fdisk -l /dev/sdd

Disk /dev/sdd: 7.29 GiB, 7818182656 bytes, 15269888 sectors
Disk model: UMS disk 0
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: A38BEDA8-7A62-4EE1-B853-2EBB2C83C622

Device        Start      End  Sectors  Size Type
/dev/sdd1      2048   524287   522240  255M EFI System
/dev/sdd2    524288 13631487 13107200  6.3G Linux root (ARM-64)
/dev/sdd3  13631488 15269854  1638367  800M Linux swa

mmc@74000: 0 (eMMC)
switch to partitions #0, OK
mmc0(part 0) is current device
Press Control+C to end USB Drive mode.
UMS: LUN 0, dev 0, hwpart 0, sector 0x0, count 0xe90000
|crq->brequest:0x0