自己的一块V3S板，2层PCB，只用它的USB，结果发现空板接到PC的USB无法连接sunxi-fel，系统提示“未知的USB设备(设备描述符请求失败)”。
测试24MHz和32.768K的时钟都是正常的，RTC-VCC=3.3V，其它1.8，1.2V的电压也都OK，肚子下的pad也焊了。
把Zero的镜像放到tf卡里也能启动。zero板子启动后系统可以检测到usb设备，但我的板子检测不到。log如下，
板子的原理图：v3s.pdf
难道和USB的走线相关？虽是2层板，但USB部分线很短，只有3cm左右。
U-Boot 2017.01-rc2-00055-gc41fbfe7b5 (Jan 20 2017 - 00:39:08 +0800) Allwinner Technology
CPU: Allwinner V3s (SUN8I 1681)
Model: Lichee Pi Zero
DRAM: 64 MiB
MMC: SUNXI SD/MMC: 0
*** Warning - bad CRC, using default environment
Setting up a 800x480 lcd console (overscan 0x0)
dotclock: 33000kHz = 33000kHz: (1 * 3MHz * 66) / 6
In: serial@01c28000
Out: serial@01c28000
Err: serial@01c28000
Net: No ethernet found.
starting USB...
No controllers found
Hit any key to stop autoboot: 0
switch to partitions #0, OK
mmc0 is current device
Scanning mmc 0:1...
Found U-Boot script /boot.scr
reading /boot.scr
287 bytes read in 16 ms (16.6 KiB/s)
## Executing script at 41900000
reading zImage
3987024 bytes read in 656 ms (5.8 MiB/s)
reading sun8i-v3s-licheepi-zero.dtb
8585 bytes read in 28 ms (298.8 KiB/s)
## Flattened Device Tree blob at 41800000
Booting using the fdt blob at 0x41800000
Loading Device Tree to 42dfa000, end 42dff188 ... OK
Starting kernel ...
[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Linux version 4.10.2-licheepi-zero+ (zp@ubuntu) (gcc version 6.3.1 20170109 (Linaro GCC 6.3-2017.027
[ 0.000000] CPU: ARMv7 Processor [410fc075] revision 5 (ARMv7), cr=10c5387d
[ 0.000000] CPU: div instructions available: patching division code
[ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[ 0.000000] OF: fdt:Machine model: Lichee Pi Zero
[ 0.000000] Memory policy: Data cache writealloc
[ 0.000000] percpu: Embedded 14 pages/cpu @c3dea000 s24652 r8192 d24500 u57344
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 15883
[ 0.000000] Kernel command line: console=ttyS0,115200 panic=5 console=tty0 rootwait root=/dev/mmcblk0p2 earlyprw
[ 0.000000] PID hash table entries: 256 (order: -2, 1024 bytes)
[ 0.000000] Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
[ 0.000000] Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
[ 0.000000] Memory: 53628K/64036K available (6144K kernel code, 213K rwdata, 1472K rodata, 1024K init, 260K bss)
[ 0.000000] Virtual kernel memory layout:
[ 0.000000] vector : 0xffff0000 - 0xffff1000 ( 4 kB)
[ 0.000000] fixmap : 0xffc00000 - 0xfff00000 (3072 kB)
[ 0.000000] vmalloc : 0xc4000000 - 0xff800000 ( 952 MB)
[ 0.000000] lowmem : 0xc0000000 - 0xc3e89000 ( 62 MB)
[ 0.000000] pkmap : 0xbfe00000 - 0xc0000000 ( 2 MB)
[ 0.000000] modules : 0xbf000000 - 0xbfe00000 ( 14 MB)
[ 0.000000] .text : 0xc0008000 - 0xc0700000 (7136 kB)
[ 0.000000] .init : 0xc0900000 - 0xc0a00000 (1024 kB)
[ 0.000000] .data : 0xc0a00000 - 0xc0a35600 ( 214 kB)
[ 0.000000] .bss : 0xc0a37000 - 0xc0a781cc ( 261 kB)
[ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] Hierarchical RCU implementation.
[ 0.000000] Build-time adjustment of leaf fanout to 32.
[ 0.000000] RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=1.
[ 0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=32, nr_cpu_ids=1
[ 0.000000] NR_IRQS:16 nr_irqs:16 16
[ 0.000000] arm_arch_timer: Architected cp15 timer(s) running at 24.00MHz (virt).
[ 0.000000] clocksource: arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0x588fe9dc0, max_idle_ns: 4407952s
[ 0.000007] sched_clock: 56 bits at 24MHz, resolution 41ns, wraps every 4398046511097ns
[ 0.000020] Switching to timer-based delay loop, resolution 41ns
[ 0.000146] clocksource: timer: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 79635851949 ns
[ 0.000356] Console: colour dummy device 80x30
[ 0.000783] console [tty0] enabled
[ 0.000825] Calibrating delay loop (skipped), value calculated using timer frequency.. 48.00 BogoMIPS (lpj=2400)
[ 0.000863] pid_max: default: 32768 minimum: 301
[ 0.001017] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.001046] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.001773] CPU: Testing write buffer coherency: ok
[ 0.002206] /cpus/cpu@0 missing clock-frequency property
[ 0.002250] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
[ 0.002640] Setting up static identity map for 0x40100000 - 0x40100058
[ 0.003423] smp: Bringing up secondary CPUs ...
[ 0.003464] smp: Brought up 1 node, 1 CPU
[ 0.003485] SMP: Total of 1 processors activated (48.00 BogoMIPS).
[ 0.003504] CPU: All CPU(s) started in SVC mode.
[ 0.004318] devtmpfs: initialized
[ 0.007084] VFP support v0.3: implementor 41 architecture 2 part 30 variant 7 rev 5
[ 0.007417] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[ 0.007470] futex hash table entries: 256 (order: 2, 16384 bytes)
[ 0.007651] pinctrl core: initialized pinctrl subsystem
[ 0.008681] NET: Registered protocol family 16
[ 0.009188] DMA: preallocated 256 KiB pool for atomic coherent allocations
[ 0.010547] hw-breakpoint: found 5 (+1 reserved) breakpoint and 4 watchpoint registers.
[ 0.010599] hw-breakpoint: maximum watchpoint size is 8 bytes.
[ 0.022017] SCSI subsystem initialized
[ 0.022342] usbcore: registered new interface driver usbfs
[ 0.022422] usbcore: registered new interface driver hub
[ 0.022532] usbcore: registered new device driver usb
[ 0.022767] pps_core: LinuxPPS API ver. 1 registered
[ 0.022791] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[ 0.022838] PTP clock support registered
[ 0.023076] Advanced Linux Sound Architecture Driver Initialized.
[ 0.024936] clocksource: Switched to clocksource arch_sys_counter
[ 0.025800] simple-framebuffer 43e89000.framebuffer: framebuffer at 0x43e89000, 0x177000 bytes, mapped to 0xc400
[ 0.025855] simple-framebuffer 43e89000.framebuffer: format=x8r8g8b8, mode=800x480x32, linelength=3200
[ 0.032741] Console: switching to colour frame buffer device 100x30
[ 0.042566] simple-framebuffer 43e89000.framebuffer: fb0: simplefb registered!
[ 0.056589] NET: Registered protocol family 2
[ 0.061008] TCP established hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.064872] TCP bind hash table entries: 1024 (order: 1, 8192 bytes)
[ 0.068757] TCP: Hash tables configured (established 1024 bind 1024)
[ 0.072596] UDP hash table entries: 256 (order: 1, 8192 bytes)
[ 0.076367] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes)
[ 0.080279] NET: Registered protocol family 1
[ 0.084559] RPC: Registered named UNIX socket transport module.
[ 0.088322] RPC: Registered udp transport module.
[ 0.091890] RPC: Registered tcp transport module.
[ 0.095373] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 0.101103] workingset: timestamp_bits=30 max_order=14 bucket_order=0
[ 0.113698] NFS: Registering the id_resolver key type
[ 0.117341] Key type id_resolver registered
[ 0.120700] Key type id_legacy registered
[ 0.124047] ntfs: driver 2.1.32 [Flags: R/W].
[ 0.132043] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 249)
[ 0.135779] io scheduler noop registered
[ 0.139287] io scheduler deadline registered
[ 0.142945] io scheduler cfq registered (default)
[ 0.150544] sun8i-v3s-pinctrl 1c20800.pinctrl: initialized sunXi PIO driver
[ 0.224069] Serial: 8250/16550 driver, 8 ports, IRQ sharing disabled
[ 0.231051] console [ttyS0] disabled
[ 0.254834] 1c28000.serial: ttyS0 at MMIO 0x1c28000 (irq = 31, base_baud = 1500000) is a U6_16550A
[ 0.855243] console [ttyS0] enabled
[ 0.862862] [drm] Initialized
[ 0.871077] libphy: Fixed MDIO Bus: probed
[ 0.878911] usbcore: registered new interface driver r8152
[ 0.887691] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 0.897457] ehci-platform: EHCI generic platform driver
[ 0.905994] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[ 0.915428] ohci-platform: OHCI generic platform driver
[ 0.923974] usbcore: registered new interface driver usb-storage
[ 0.933262] usbcore: registered new interface driver ums-freecom
[ 0.942829] udc-core: couldn't find an available UDC - added [g_cdc] to list of pending drivers
[ 0.955835] sun6i-rtc 1c20400.rtc: rtc core: registered rtc-sun6i as rtc0
[ 0.966007] sun6i-rtc 1c20400.rtc: RTC enabled
[ 0.973753] i2c /dev entries driver
[ 0.981857] input: ns2009_ts as /devices/platform/soc/1c2ac00.i2c/i2c-0/0-0048/input/input0
[ 0.995120] sunxi-wdt 1c20ca0.watchdog: Watchdog enabled (timeout=16 sec, nowayout=0)
[ 1.064979] sunxi-mmc 1c0f000.mmc: base:0xc405d000 irq:23
[ 1.074810] usbcore: registered new interface driver usbhid
[ 1.083952] usbhid: USB HID core driver
[ 1.093339] NET: Registered protocol family 17
[ 1.101570] Key type dns_resolver registered
[ 1.109457] Registering SWP/SWPB emulation handler
[ 1.123958] usb_phy_generic.0.auto supply vcc not found, using dummy regulator
[ 1.135605] musb-hdrc musb-hdrc.1.auto: MUSB HDRC host driver
[ 1.145053] musb-hdrc musb-hdrc.1.auto: new USB bus registered, assigned bus number 1
[ 1.159885] hub 1-0:1.0: USB hub found
[ 1.167455] hub 1-0:1.0: 1 port detected
[ 1.175787] using random self ethernet address
[ 1.183612] using random host ethernet address
[ 1.192354] usb0: HOST MAC 0e:6d:ea:59:cd:a9
[ 1.200009] usb0: MAC a2:de:29:0d:7a:bc
[ 1.207133] g_cdc gadget: CDC Composite Gadget, version: King Kamehameha Day 2008
[ 1.217977] g_cdc gadget: g_cdc ready
[ 1.225254] sun6i-rtc 1c20400.rtc: setting system clock to 1970-01-01 00:00:22 UTC (22)
[ 1.236961] vcc3v0: disabling
[ 1.243269] vcc5v0: disabling
[ 1.249504] ALSA device list:
[ 1.255641] No soundcards found.
[ 1.263833] Waiting for root device /dev/mmcblk0p2...
[ 1.312281] mmc0: host does not support reading read-only switch, assuming write-enable
[ 1.325780] mmc0: new high speed SDHC card at address 59b4
[ 1.335373] mmcblk0: mmc0:59b4 USDU1 14.7 GiB
[ 1.344642] mmcblk0: p1 p2
[ 1.356490] EXT4-fs (mmcblk0p2): couldn't mount as ext3 due to feature incompatibilities
[ 1.369258] EXT4-fs (mmcblk0p2): couldn't mount as ext2 due to feature incompatibilities
[ 1.444558] random: fast init done
[ 1.543716] EXT4-fs (mmcblk0p2): recovery complete
[ 1.554391] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
[ 1.565766] VFS: Mounted root (ext4 filesystem) on device 179:2.
[ 1.577091] devtmpfs: mounted
[ 1.584513] Freeing unused kernel memory: 1024K
[ 1.765421] systemd[1]: systemd 215 running in system mode. (+PAM +AUDIT +SELINUX +IMA +SYSVINIT +LIBCRYPTSETUP)
[ 1.786013] systemd[1]: Detected architecture 'arm'.
[ 1.847346] systemd[1]: Failed to insert module 'autofs4'
[ 1.856631] systemd[1]: Failed to insert module 'ipv6'
[ 1.867371] systemd[1]: Set hostname to <LicheePi>.
[ 2.301918] systemd[1]: Cannot add dependency job for unit dbus.socket, ignoring: Unit dbus.socket failed to lo.
[ 2.322021] systemd[1]: Cannot add dependency job for unit display-manager.service, ignoring: Unit display-mana.
[ 2.346969] systemd[1]: Starting Forward Password Requests to Wall Directory Watch.
[ 2.359193] systemd[1]: Started Forward Password Requests to Wall Directory Watch.
[ 2.370894] systemd[1]: Expecting device dev-ttyS0.device...
[ 3.114783] systemd-udevd[91]: starting version 215
[ 3.392210] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null)
[ 4.169847] FAT-fs (mmcblk0p1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
[ 4.738232] systemd-journald[80]: Received request to flush runtime journal from PID 1
Debian GNU/Linux 8 LicheePi ttyS0
LicheePi login:
Debian GNU/Linux 8 LicheePi ttyS0
LicheePi login: root
Password:
Last login: Thu Jan 1 08:00:36 HKT 1970 on ttyS0
Linux LicheePi 4.10.2-licheepi-zero+ #15 SMP Sat Apr 15 21:38:23 CST 2017 armv7l
The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.
Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
root@LicheePi:~# 离线
USB走线有规范的，可以搜一下
离线
还有，你的USB连接线最好用手机原装的。
离线
USB OTG需要上拉吧
离线
兄弟 ，您的 u-boot怎么编译的啊？ 我的提示找不到zImage文件。
离线
兄弟 ，您的 u-boot怎么编译的啊？ 我的提示找不到zImage文件。
按这上面的步骤来的，https://wiki.sipeed.com/soft/Lichee/zh/Zero-Doc/Start/board_intro.html
离线