In the 2019.1 release U-boot for Zynq UltraScale+ devices, USB3.0 device mode does not work when booting through USB boot mode.
For example, if you are using an Ultra96 Rev 1 board with USB boot mode it hangs without a successful boot.
Xilinx Zynq MP First Stage Boot Loader
Release 2018.3 Nov 13 2018 - 12:39:17
PMU Firmware 2018.3 Nov 13 2018 12:38:36
PMU_ROM Version: xpbr-v8.1.0-0
PMUFW: v1.1
U-Boot 2018.01 (Nov 13 2018 - 13:49:20 +0000)
Model: Avnet Ultra96 Rev1
Board: Xilinx ZynqMP
I2C: ready
DRAM: 2 GiB
EL Level: EL2
Chip ID: zu3eg
Watchdog: Not found!
MMC: mmc@ff160000: 0 (SD), mmc@ff170000: 1
reading uboot.env
** Unable to read "uboot.env" from mmc0:1 **
Using default environment
In: serial@ff010000
Out: serial@ff010000
Err: serial@ff010000
Model: Avnet Ultra96 Rev1
Board: Xilinx ZynqMP
Bootmode: USB_MODE
Net: Net Initialization Skipped
No ethernet found.
U-BOOT for xilinx-ultra96-reva-2018_3
Hit any key to stop autoboot: 0
ZynqMP> run dfu_ram
#DOWNLOAD ... OK
Ctrl+C to exit ...
ZynqMP> bootm
## Loading kernel from FIT Image at 10000000 ...
Using 'conf@system-top.dtb' configuration
Trying 'kernel@1' kernel subimage
Description: Linux kernel
Type: Kernel Image
Compression: gzip compressed
Data Start: 0x10000108
Data Size: 7128010 Bytes = 6.8 MiB
Architecture: AArch64
OS: Linux
Load Address: 0x00080000
Entry Point: 0x00080000
Hash algo: sha1
Hash value: 34f588e3ef20ba73c09a13be97193388d067bc3f
Verifying Hash Integrity ... sha1+ OK
## Loading fdt from FIT Image at 10000000 ...
Using 'conf@system-top.dtb' configuration
Trying 'fdt@system-top.dtb' fdt subimage
Description: Flattened Device Tree blob
Type: Flat Device Tree
Compression: uncompressed
Data Start: 0x106cc5d8
Data Size: 40994 Bytes = 40 KiB
Architecture: AArch64
Hash algo: sha1
Hash value: 93269a8aafec5d21478c02f42f856d896db34dcc
Verifying Hash Integrity ... sha1+ OK
Booting using the fdt blob at 0x106cc5d8
Uncompressing Kernel Image ... OK
Loading Device Tree to 0000000007ff2000, end 0000000007fff021 ... OK
Starting kernel ...
[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Linux version 4.14.0-xilinx-v2018.3 (oe-user@oe-host) (gcc version 7.3.0 (GCC)) #1 SMP Mon Nov 12 14:13:59 UTC 2018
[ 0.000000] Boot CPU: AArch64 Processor [410fd034]
[ 0.000000] Machine model: Avnet Ultra96 Rev1
[ 0.000000] earlycon: cdns0 at MMIO 0x00000000ff010000 (options '115200n8')
[ 0.000000] bootconsole [cdns0] enabled
[ 0.000000] efi: Getting EFI parameters from FDT:
[ 0.000000] efi: UEFI not found.
[ 0.000000] cma: Reserved 256 MiB at 0x000000006fc00000
[ 0.000000] psci: probing for conduit method from DT.
[ 0.000000] psci: PSCIv1.1 detected in firmware.
[ 0.000000] psci: Using standard PSCI v0.2 function IDs
[ 0.000000] psci: MIGRATE_INFO_TYPE not supported.
[ 0.000000] random: fast init done
[ 0.000000] percpu: Embedded 21 pages/cpu @ffffffc07fe68000 s46488 r8192 d31336 u86016
[ 0.000000] Detected VIPT I-cache on CPU0
[ 0.000000] CPU features: enabling workaround for ARM erratum 845719
[ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 512771
[ 0.000000] Kernel command line: earlycon console=ttyPS0,115200 clk_ignore_unused root=/dev/mmcblk0p2 rw rootwait
[ 0.000000] PID hash table entries: 4096 (order: 3, 32768 bytes)
[ 0.000000] Dentry cache hash table entries: 262144 (order: 9, 2097152 bytes)
[ 0.000000] Inode-cache hash table entries: 131072 (order: 8, 1048576 bytes)
[ 0.000000] Memory: 1768112K/2079744K available (10172K kernel code, 666K rwdata, 3256K rodata, 512K init, 2360K bss, 49488K reserved, 262144K cma-reserved)
[ 0.000000] Virtual kernel memory layout:
[ 0.000000] modules : 0xffffff8000000000 - 0xffffff8008000000 ( 128 MB)
[ 0.000000] vmalloc : 0xffffff8008000000 - 0xffffffbebfff0000 ( 250 GB)
[ 0.000000] .text : 0xffffff8008080000 - 0xffffff8008a70000 ( 10176 KB)
[ 0.000000] .rodata : 0xffffff8008a70000 - 0xffffff8008db0000 ( 3328 KB)
[ 0.000000] .init : 0xffffff8008db0000 - 0xffffff8008e30000 ( 512 KB)
[ 0.000000] .data : 0xffffff8008e30000 - 0xffffff8008ed6a00 ( 667 KB)
[ 0.000000] .bss : 0xffffff8008ed6a00 - 0xffffff8009124db0 ( 2361 KB)
[ 0.000000] fixed : 0xffffffbefe7fd000 - 0xffffffbefec00000 ( 4108 KB)
[ 0.000000] PCI I/O : 0xffffffbefee00000 - 0xffffffbeffe00000 ( 16 MB)
[ 0.000000] vmemmap : 0xffffffbf00000000 - 0xffffffc000000000 ( 4 GB maximum)
[ 0.000000] 0xffffffbf00000000 - 0xffffffbf01bfc800 ( 27 MB actual)
[ 0.000000] memory : 0xffffffc000000000 - 0xffffffc07ff00000 ( 2047 MB)
[ 0.000000] Hierarchical RCU implementation.
[ 0.000000] RCU event tracing is enabled.
[ 0.000000] RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=4.
[ 0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=4
[ 0.000000] NR_IRQS: 64, nr_irqs: 64, preallocated irqs: 0
[ 0.000000] GIC: Adjusting CPU interface base to 0x00000000f902f000
[ 0.000000] GIC: Using split EOI/Deactivate mode
[ 0.000000] arch_timer: cp15 timer(s) running at 99.99MHz (phys).
[ 0.000000] clocksource: arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0x17102373f5, max_idle_ns: 440795203772 ns
[ 0.000004] sched_clock: 56 bits at 99MHz, resolution 10ns, wraps every 4398046511100ns
[ 0.008344] Console: colour dummy device 80x25
[ 0.012393] Calibrating delay loop (skipped), value calculated using timer frequency.. 199.99 BogoMIPS (lpj=399999)
[ 0.022754] pid_max: default: 32768 minimum: 301
[ 0.027447] Mount-cache hash table entries: 4096 (order: 3, 32768 bytes)
[ 0.034008] Mountpoint-cache hash table entries: 4096 (order: 3, 32768 bytes)
[ 0.041825] ASID allocator initialised with 65536 entries
[ 0.046506] Hierarchical SRCU implementation.
[ 0.051126] EFI services will not be available.
[ 0.055299] zynqmp_plat_init Platform Management API v1.1
[ 0.060641] zynqmp_plat_init Trustzone version v1.0
[ 0.065590] smp: Bringing up secondary CPUs ...
[ 0.070258] Detected VIPT I-cache on CPU1
[ 0.070295] CPU1: Booted secondary processor [410fd034]
[ 0.070593] Detected VIPT I-cache on CPU2
[ 0.070612] CPU2: Booted secondary processor [410fd034]
[ 0.070891] Detected VIPT I-cache on CPU3
[ 0.070909] CPU3: Booted secondary processor [410fd034]
[ 0.070952] smp: Brought up 1 node, 4 CPUs
[ 0.101554] SMP: Total of 4 processors activated.
[ 0.106228] CPU features: detected feature: 32-bit EL0 Support
[ 0.112026] CPU: All CPU(s) started at EL2
[ 0.116098] alternatives: patching kernel code
[ 0.121225] devtmpfs: initialized
[ 0.128470] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns
[ 0.133488] futex hash table entries: 1024 (order: 5, 131072 bytes)
[ 0.145831] xor: measuring software checksum speed
[ 0.183802] 8regs : 2303.000 MB/sec
[ 0.223831] 8regs_prefetch: 2053.000 MB/sec
[ 0.263861] 32regs : 2830.000 MB/sec
[ 0.303892] 32regs_prefetch: 2379.000 MB/sec
[ 0.303924] xor: using function: 32regs (2830.000 MB/sec)
[ 0.308317] pinctrl core: initialized pinctrl subsystem
[ 0.314085] NET: Registered protocol family 16
[ 0.318552] cpuidle: using governor menu
[ 0.322320] vdso: 2 pages (1 code @ ffffff8008a76000, 1 data @ ffffff8008e34000)
[ 0.329085] hw-breakpoint: found 6 breakpoint and 4 watchpoint registers.
[ 0.336438] DMA: preallocated 256 KiB pool for atomic allocations
[ 0.363603] reset_zynqmp reset-controller: Xilinx zynqmp reset driver probed
[ 0.365577] ARM CCI_400_r1 PMU driver probed
[ 0.370166] zynqmp-pinctrl ff180000.pinctrl: zynqmp pinctrl initialized
[ 0.385865] HugeTLB registered 2.00 MiB page size, pre-allocated 0 pages
[ 0.453648] raid6: int64x1 gen() 402 MB/s
[ 0.521642] raid6: int64x1 xor() 445 MB/s
[ 0.589686] raid6: int64x2 gen() 689 MB/s
[ 0.657724] raid6: int64x2 xor() 602 MB/s
[ 0.725783] raid6: int64x4 gen() 1042 MB/s
[ 0.793845] raid6: int64x4 xor() 739 MB/s
[ 0.861918] raid6: int64x8 gen() 980 MB/s
[ 0.929939] raid6: int64x8 xor() 737 MB/s
[ 0.997977] raid6: neonx1 gen() 726 MB/s
[ 1.066039] raid6: neonx1 xor() 854 MB/s
[ 1.134097] raid6: neonx2 gen() 1168 MB/s
[ 1.202134] raid6: neonx2 xor() 1202 MB/s
[ 1.270197] raid6: neonx4 gen() 1502 MB/s
[ 1.338219] raid6: neonx4 xor() 1437 MB/s
[ 1.406267] raid6: neonx8 gen() 1649 MB/s
[ 1.474322] raid6: neonx8 xor() 1525 MB/s
[ 1.474351] raid6: using algorithm neonx8 gen() 1649 MB/s
[ 1.478315] raid6: .... xor() 1525 MB/s, rmw enabled
[ 1.483245] raid6: using neon recovery algorithm
[ 1.489188] SCSI subsystem initialized
[ 1.491752] usbcore: registered new interface driver usbfs
[ 1.497032] usbcore: registered new interface driver hub
[ 1.502313] usbcore: registered new device driver usb
[ 1.507361] media: Linux media interface: v0.10
[ 1.511812] Linux video capture interface: v2.00
[ 1.516414] pps_core: LinuxPPS API ver. 1 registered
[ 1.521305] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[ 1.530399] PTP clock support registered
[ 1.534297] EDAC MC: Ver: 3.0.0
[ 1.537860] zynqmp-ipi ff9905c0.mailbox: Probed ZynqMP IPI Mailbox driver.
[ 1.544456] FPGA manager framework
[ 1.547729] fpga-region fpga-full: FPGA Region probed
[ 1.552780] Advanced Linux Sound Architecture Driver Initialized.
[ 1.558977] Bluetooth: Core ver 2.22
[ 1.562238] NET: Registered protocol family 31
[ 1.566633] Bluetooth: HCI device and connection manager initialized
[ 1.572950] Bluetooth: HCI socket layer initialized
[ 1.577792] Bluetooth: L2CAP socket layer initialized
[ 1.582827] Bluetooth: SCO socket layer initialized
[ 1.588293] clocksource: Switched to clocksource arch_sys_counter
[ 1.593801] VFS: Disk quotas dquot_6.6.0
[ 1.597648] VFS: Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
[ 1.608644] NET: Registered protocol family 2
[ 1.609104] TCP established hash table entries: 16384 (order: 5, 131072 bytes)
[ 1.616044] TCP bind hash table entries: 16384 (order: 6, 262144 bytes)
[ 1.622835] TCP: Hash tables configured (established 16384 bind 16384)
[ 1.629097] UDP hash table entries: 1024 (order: 3, 32768 bytes)
[ 1.635002] UDP-Lite hash table entries: 1024 (order: 3, 32768 bytes)
[ 1.641503] NET: Registered protocol family 1
[ 1.645916] RPC: Registered named UNIX socket transport module.
[ 1.651580] RPC: Registered udp transport module.
[ 1.656247] RPC: Registered tcp transport module.
[ 1.660917] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 1.667908] hw perfevents: no interrupt-affinity property for /pmu, guessing.
[ 1.674794] hw perfevents: enabled with armv8_pmuv3 PMU driver, 7 counters available
[ 1.682904] audit: initializing netlink subsys (disabled)
[ 1.687548] audit: type=2000 audit(1.632:1): state=initialized audit_enabled=0 res=1
[ 1.687898] workingset: timestamp_bits=62 max_order=19 bucket_order=0
[ 1.702305] NFS: Registering the id_resolver key type
[ 1.706620] Key type id_resolver registered
[ 1.710741] Key type id_legacy registered
[ 1.714727] nfs4filelayout_init: NFSv4 File Layout Driver Registering...
[ 1.721397] jffs2: version 2.2. (NAND) 2001-2006 Red Hat, Inc.
[ 1.750992] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 247)
[ 1.752743] io scheduler noop registered
[ 1.756631] io scheduler deadline registered
[ 1.760881] io scheduler cfq registered (default)
[ 1.765540] io scheduler mq-deadline registered
[ 1.770037] io scheduler kyber registered
[ 1.775562] xilinx-dpdma fd4c0000.dma: Xilinx DPDMA engine is probed
[ 1.780745] xilinx-zynqmp-dma fd500000.dma: ZynqMP DMA driver Probe success
[ 1.787406] xilinx-zynqmp-dma fd510000.dma: ZynqMP DMA driver Probe success
[ 1.794325] xilinx-zynqmp-dma fd520000.dma: ZynqMP DMA driver Probe success
[ 1.801243] xilinx-zynqmp-dma fd530000.dma: ZynqMP DMA driver Probe success
[ 1.808160] xilinx-zynqmp-dma fd540000.dma: ZynqMP DMA driver Probe success
[ 1.815076] xilinx-zynqmp-dma fd550000.dma: ZynqMP DMA driver Probe success
[ 1.822002] xilinx-zynqmp-dma fd560000.dma: ZynqMP DMA driver Probe success
[ 1.828928] xilinx-zynqmp-dma fd570000.dma: ZynqMP DMA driver Probe success
[ 1.835913] xilinx-zynqmp-dma ffa80000.dma: ZynqMP DMA driver Probe success
[ 1.842763] xilinx-zynqmp-dma ffa90000.dma: ZynqMP DMA driver Probe success
[ 1.849678] xilinx-zynqmp-dma ffaa0000.dma: ZynqMP DMA driver Probe success
[ 1.856600] xilinx-zynqmp-dma ffab0000.dma: ZynqMP DMA driver Probe success
[ 1.863519] xilinx-zynqmp-dma ffac0000.dma: ZynqMP DMA driver Probe success
[ 1.870441] xilinx-zynqmp-dma ffad0000.dma: ZynqMP DMA driver Probe success
[ 1.877369] xilinx-zynqmp-dma ffae0000.dma: ZynqMP DMA driver Probe success
[ 1.884293] xilinx-zynqmp-dma ffaf0000.dma: ZynqMP DMA driver Probe success
[ 1.891320] xilinx-frmbuf 80020000.v_frmbuf_wr: Probe deferred due to GPIO reset defer
[ 1.926283] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
[ 1.928738] 80060000.serial: ttyS2 at MMIO 0x80061000 (irq = 46, base_baud = 6249993) is a 16550A
[