在ZYNQ啟動過程中，USB設(shè)備會報如下錯誤：

Run?/sbin/init?as?init?process
usb?1-1:?new?low-speed?USB?device?number?2?using?ci_hdrc
INIT:?version?2.99?booting
usb?1-1:?device?descriptor?read/64,?error?-71
Starting?udev
Starting?version?249.7+
usb?1-1:?device?descriptor?read/64,?error?-71
usb?1-1:?new?low-speed?USB?device?number?3?using?ci_hdrc

加載完之后，再去測量CH9344L硬件上的30Mhz晶振不工作。

使用示波器測量D+ D-和30Mhz晶振的輸出，發(fā)現(xiàn)在USB和CH9344L通訊過程中，30Mhz晶振會從正常輸出變化為無輸出（高電平），請問可能是什么原因引起的？

硬件設(shè)計參照官方評估板設(shè)計。

您好，如上提示確為硬件工作不正常導(dǎo)致枚舉過程失敗，和設(shè)備驅(qū)動是否加載沒有關(guān)聯(lián)。CH9344為USB高速設(shè)備，如上信息識別為低速，可見設(shè)備上電時的枚舉過程就發(fā)生了異常。芯片USB無法工作時，晶體會停振，所以根因并非晶體電路問題。

1、嘗試斷開串口負載（或保證CH9344比連接的串口設(shè)備先上電）再進行測試；

2、異常后，CH9344重新上下電（徹底掉電）；

3、用示波器監(jiān)控下CH9344的V33電源上電波形，確認下上電過程是否穩(wěn)定。注：2和3均需要在斷開串口負載的時候測試。

你好，我剛剛按照你的第一點操作之后，斷開了四路串口所有的負載，目前是懸空狀態(tài)，在第一次上電之后，在ZYNQ加載過程中并未出現(xiàn)剛剛的錯誤，但是在系統(tǒng)中并未找到掛載的USB設(shè)備，后面上電過程中依然會出現(xiàn)剛剛的錯誤。

后來使用示波器測量過該芯片的3V3電源，上電過程正常，并沒有發(fā)現(xiàn)明顯的掉電情況。

CH9344使用整板的3V3供電

可以提供下剛才操作的日志過程，即串口負載懸空時，上電后的和ch9344相關(guān)的系統(tǒng)日志。

如下

Starting?kernel?...

Booting?Linux?on?physical?CPU?0x0
Linux?version?5.15.19-xilinx-v2022.1?(oe-user@oe-host)?(arm-xilinx-linux-gnueabi-gcc?(GCC)?11.2.0,?GNU?ld?(GNU?Binutils)?2.37.20210721)?#1?SMP?PREEMPT?Mon?Apr?11?17:52:14?UTC?2022
CPU:?ARMv7?Processor?[413fc090]?revision?0?(ARMv7),?cr=18c5387d
CPU:?PIPT?/?VIPT?nonaliasing?data?cache,?VIPT?aliasing?instruction?cache
OF:?fdt:?Machine?model:?xlnx,zynq-7000
earlycon:?cdns0?at?MMIO?0xe0000000?(options?'115200n8')
printk:?bootconsole?[cdns0]?enabled
Memory?policy:?Data?cache?writealloc
cma:?Reserved?36?MiB?at?0x3dc00000
Zone?ranges:
??Normal???[mem?0x0000000000000000-0x000000002fffffff]
??HighMem??[mem?0x0000000030000000-0x000000003fffffff]
Movable?zone?start?for?each?node
Early?memory?node?ranges
??node???0:?[mem?0x0000000000000000-0x000000003fffffff]
Initmem?setup?node?0?[mem?0x0000000000000000-0x000000003fffffff]
percpu:?Embedded?12?pages/cpu?s16588?r8192?d24372?u49152
Built?1?zonelists,?mobility?grouping?on.??Total?pages:?260608
Kernel?command?line:?console=ttyPS0,115200?earlycon?root=/dev/mmcblk0p2?rw?rootwait
Dentry?cache?hash?table?entries:?131072?(order:?7,?524288?bytes,?linear)
Inode-cache?hash?table?entries:?65536?(order:?6,?262144?bytes,?linear)
mem?auto-init:?stack:off,?heap?alloc:off,?heap?free:off
Memory:?990392K/1048576K?available?(7168K?kernel?code,?252K?rwdata,?1932K?rodata,?1024K?init,?121K?bss,?21320K?reserved,?36864K?cma-reserved,?225280K?highmem)
rcu:?Preemptible?hierarchical?RCU?implementation.
rcu:????RCU?event?tracing?is?enabled.
rcu:????RCU?restricting?CPUs?from?NR_CPUS=4?to?nr_cpu_ids=2.
????????Trampoline?variant?of?Tasks?RCU?enabled.
rcu:?RCU?calculated?value?of?scheduler-enlistment?delay?is?10?jiffies.
rcu:?Adjusting?geometry?for?rcu_fanout_leaf=16,?nr_cpu_ids=2
NR_IRQS:?16,?nr_irqs:?16,?preallocated?irqs:?16
efuse?mapped?to?(ptrval)
slcr?mapped?to?(ptrval)
GIC?physical?location?is?0xf8f01000
L2C:?platform?modifies?aux?control?register:?0x72360000?->?0x72760000
L2C:?DT/platform?modifies?aux?control?register:?0x72360000?->?0x72760000
L2C-310?erratum?769419?enabled
L2C-310?enabling?early?BRESP?for?Cortex-A9
L2C-310?full?line?of?zeros?enabled?for?Cortex-A9
L2C-310?ID?prefetch?enabled,?offset?1?lines
L2C-310?dynamic?clock?gating?enabled,?standby?mode?enabled
L2C-310?cache?controller?enabled,?8?ways,?512?kB
L2C-310:?CACHE_ID?0x410000c8,?AUX_CTRL?0x76760001
random:?get_random_bytes?called?from?start_kernel+0x364/0x5d4?with?crng_init=0
zynq_clock_init:?clkc?starts?at?(ptrval)
Zynq?clock?init
sched_clock:?64?bits?at?199MHz,?resolution?5ns,?wraps?every?4398046511102ns
clocksource:?arm_global_timer:?mask:?0xffffffffffffffff?max_cycles:?0x2e2049cb99,?max_idle_ns:?440795211806?ns
Switching?to?timer-based?delay?loop,?resolution?5ns
Console:?colour?dummy?device?80x30
Calibrating?delay?loop?(skipped),?value?calculated?using?timer?frequency..?399.99?BogoMIPS?(lpj=1999999)
pid_max:?default:?32768?minimum:?301
Mount-cache?hash?table?entries:?2048?(order:?1,?8192?bytes,?linear)
Mountpoint-cache?hash?table?entries:?2048?(order:?1,?8192?bytes,?linear)
CPU:?Testing?write?buffer?coherency:?ok
CPU0:?Spectre?v2:?using?BPIALL?workaround
CPU0:?thread?-1,?cpu?0,?socket?0,?mpidr?80000000
Setting?up?static?identity?map?for?0x100000?-?0x100060
rcu:?Hierarchical?SRCU?implementation.
smp:?Bringing?up?secondary?CPUs?...
CPU1:?thread?-1,?cpu?1,?socket?0,?mpidr?80000001
CPU1:?Spectre?v2:?using?BPIALL?workaround
smp:?Brought?up?1?node,?2?CPUs
SMP:?Total?of?2?processors?activated?(799.99?BogoMIPS).
CPU:?All?CPU(s)?started?in?SVC?mode.
devtmpfs:?initialized
VFP?support?v0.3:?implementor?41?architecture?3?part?30?variant?9?rev?4
clocksource:?jiffies:?mask:?0xffffffff?max_cycles:?0xffffffff,?max_idle_ns:?19112604462750000?ns
futex?hash?table?entries:?512?(order:?3,?32768?bytes,?linear)
pinctrl?core:?initialized?pinctrl?subsystem
NET:?Registered?PF_NETLINK/PF_ROUTE?protocol?family
DMA:?preallocated?256?KiB?pool?for?atomic?coherent?allocations
thermal_sys:?Registered?thermal?governor?'step_wise'
cpuidle:?using?governor?menu
amba?f8801000.etb:?Fixing?up?cyclic?dependency?with?replicator
amba?f8803000.tpiu:?Fixing?up?cyclic?dependency?with?replicator
amba?f8804000.funnel:?Fixing?up?cyclic?dependency?with?replicator
amba?f889c000.ptm:?Fixing?up?cyclic?dependency?with?f8804000.funnel
amba?f889d000.ptm:?Fixing?up?cyclic?dependency?with?f8804000.funnel
hw-breakpoint:?found?5?(+1?reserved)?breakpoint?and?1?watchpoint?registers.
hw-breakpoint:?maximum?watchpoint?size?is?4?bytes.
zynq-ocm?f800c000.ocmc:?ZYNQ?OCM?pool:?256?KiB?@?0x(ptrval)
e0001000.serial:?ttyPS1?at?MMIO?0xe0001000?(irq?=?33,?base_baud?=?6249999)?is?a?xuartps
vgaarb:?loaded
SCSI?subsystem?initialized
usbcore:?registered?new?interface?driver?usbfs
usbcore:?registered?new?interface?driver?hub
usbcore:?registered?new?device?driver?usb
mc:?Linux?media?interface:?v0.10
videodev:?Linux?video?capture?interface:?v2.00
pps_core:?LinuxPPS?API?ver.?1?registered
pps_core:?Software?ver.?5.3.6?-?Copyright?2005-2007?Rodolfo?Giometti?<個人信息保護，已隱藏>
PTP?clock?support?registered
EDAC?MC:?Ver:?3.0.0
FPGA?manager?framework
Advanced?Linux?Sound?Architecture?Driver?Initialized.
clocksource:?Switched?to?clocksource?arm_global_timer
NET:?Registered?PF_INET?protocol?family
IP?idents?hash?table?entries:?16384?(order:?5,?131072?bytes,?linear)
tcp_listen_portaddr_hash?hash?table?entries:?512?(order:?0,?6144?bytes,?linear)
TCP?established?hash?table?entries:?8192?(order:?3,?32768?bytes,?linear)
TCP?bind?hash?table?entries:?8192?(order:?4,?65536?bytes,?linear)
TCP:?Hash?tables?configured?(established?8192?bind?8192)
UDP?hash?table?entries:?512?(order:?2,?16384?bytes,?linear)
UDP-Lite?hash?table?entries:?512?(order:?2,?16384?bytes,?linear)
NET:?Registered?PF_UNIX/PF_LOCAL?protocol?family
RPC:?Registered?named?UNIX?socket?transport?module.
RPC:?Registered?udp?transport?module.
RPC:?Registered?tcp?transport?module.
RPC:?Registered?tcp?NFSv4.1?backchannel?transport?module.
PCI:?CLS?0?bytes,?default?64
armv7-pmu?f8891000.pmu:?hw?perfevents:?no?interrupt-affinity?property,?guessing.
hw?perfevents:?enabled?with?armv7_cortex_a9?PMU?driver,?7?counters?available
workingset:?timestamp_bits=30?max_order=18?bucket_order=0
jffs2:?version?2.2.?(NAND)?(SUMMARY)????2001-2006?Red?Hat,?Inc.
bounce:?pool?size:?64?pages
io?scheduler?mq-deadline?registered
io?scheduler?kyber?registered
zynq-pinctrl?700.pinctrl:?zynq?pinctrl?initialized
dma-pl330?f8003000.dmac:?Loaded?driver?for?PL330?DMAC-241330
dma-pl330?f8003000.dmac:????????DBUFF-128x8bytes?Num_Chans-8?Num_Peri-4?Num_Events-16
brd:?module?loaded
loop:?module?loaded
physmap-flash?60000000.flash:?physmap?platform?flash?device:?[mem?0x60000000-0x61ffffff]
physmap-flash?60000000.flash:?map_probe?failed
spi-nor?spi0.0:?found?n25q256a,?expected?n25q128a11
spi-nor?spi0.0:?n25q256a?(32768?Kbytes)
4?fixed-partitions?partitions?found?on?MTD?device?spi0.0
Creating?4?MTD?partitions?on?"spi0.0":
0x000000000000-0x000000fe0000?:?"boot"
0x000000fe0000-0x000001000000?:?"bootenv"
0x000001000000-0x000001fc0000?:?"kernel"
0x000001fc0000-0x000002000000?:?"spare"
CAN?device?driver?interface
macb?e000b000.ethernet?eth0:?Cadence?GEM?rev?0x00020118?at?0xe000b000?irq?35?(00:0a:35:00:b4:ee)
e1000e:?Intel(R)?PRO/1000?Network?Driver
e1000e:?Copyright(c)?1999?-?2015?Intel?Corporation.
ehci_hcd:?USB?2.0?'Enhanced'?Host?Controller?(EHCI)?Driver
ehci-pci:?EHCI?PCI?platform?driver
ohci_hcd:?USB?1.1?'Open'?Host?Controller?(OHCI)?Driver
ohci-pci:?OHCI?PCI?platform?driver
uhci_hcd:?USB?Universal?Host?Controller?Interface?driver
usbcore:?registered?new?interface?driver?cdc_acm
cdc_acm:?USB?Abstract?Control?Model?driver?for?USB?modems?and?ISDN?adapters
usbcore:?registered?new?interface?driver?usb-storage
usbcore:?registered?new?interface?driver?usbtest
ULPI?transceiver?vendor/product?ID?0x0451/0x1507
Found?TI?TUSB1210?ULPI?transceiver.
ULPI?integrity?check:?passed.
ci_hdrc?ci_hdrc.0:?EHCI?Host?Controller
ci_hdrc?ci_hdrc.0:?new?USB?bus?registered,?assigned?bus?number?1
ci_hdrc?ci_hdrc.0:?USB?2.0?started,?EHCI?1.00
hub?1-0:1.0:?USB?hub?found
hub?1-0:1.0:?1?port?detected
i2c_dev:?i2c?/dev?entries?driver
cdns-wdt?f8005000.watchdog:?Xilinx?Watchdog?Timer?with?timeout?10s
EDAC?MC:?ECC?not?enabled
Xilinx?Zynq?CpuIdle?Driver?started
sdhci:?Secure?Digital?Host?Controller?Interface?driver
sdhci:?Copyright(c)?Pierre?Ossman
sdhci-pltfm:?SDHCI?platform?and?OF?driver?helper
ledtrig-cpu:?registered?to?indicate?activity?on?CPUs
clocksource:?ttc_clocksource:?mask:?0xffff?max_cycles:?0xffff,?max_idle_ns:?447945978?ns
timer?#0?at?(ptrval),?irq=48
usbcore:?registered?new?interface?driver?usbhid
usbhid:?USB?HID?core?driver
fpga_manager?fpga0:?Xilinx?Zynq?FPGA?Manager?registered
NET:?Registered?PF_INET6?protocol?family
Segment?Routing?with?IPv6
In-situ?OAM?(IOAM)?with?IPv6
sit:?IPv6,?IPv4?and?MPLS?over?IPv4?tunneling?driver
mmc0:?SDHCI?controller?on?e0100000.mmc?[e0100000.mmc]?using?ADMA
NET:?Registered?PF_PACKET?protocol?family
can:?controller?area?network?core
NET:?Registered?PF_CAN?protocol?family
can:?raw?protocol
can:?broadcast?manager?protocol
can:?netlink?gateway?-?max_hops=1
Registering?SWP/SWPB?emulation?handler
e0000000.serial:?ttyPS0?at?MMIO?0xe0000000?(irq?=?32,?base_baud?=?6249999)?is?a?xuartps
printk:?console?[ttyPS0]?enabled
printk:?console?[ttyPS0]?enabled
printk:?bootconsole?[cdns0]?disabled
printk:?bootconsole?[cdns0]?disabled
of-fpga-region?fpga-full:?FPGA?Region?probed
of_cfs_init
of_cfs_init:?OK
ALSA?device?list:
??No?soundcards?found.
Waiting?for?root?device?/dev/mmcblk0p2...
mmc0:?new?high?speed?SDHC?card?at?address?5048
mmcblk0:?mmc0:5048?SD32G?29.7?GiB
?mmcblk0:?p1?p2
random:?fast?init?done
EXT4-fs?(mmcblk0p2):?recovery?complete
EXT4-fs?(mmcblk0p2):?mounted?filesystem?with?ordered?data?mode.?Opts:?(null).?Quota?mode:?disabled.
VFS:?Mounted?root?(ext4?filesystem)?on?device?179:2.
devtmpfs:?mounted
Freeing?unused?kernel?image?(initmem)?memory:?1024K
Run?/sbin/init?as?init?process
usb?1-1:?new?low-speed?USB?device?number?2?using?ci_hdrc
INIT:?version?2.99?booting
usb?1-1:?device?descriptor?read/64,?error?-71
Starting?udev
Starting?version?249.7+
usb?1-1:?device?descriptor?read/64,?error?-71
usb?1-1:?new?low-speed?USB?device?number?3?using?ci_hdrc
zxaxi:?loading?out-of-tree?module?taints?kernel.
<1>Hello?module?world.
zxaxi?amba_pl:axi_zxdev0@0:?Device?Tree?Probing
ZXAXI:?zxaxi_dma.c:?zxaxi_dma_init:?184:?dev?c19ee600
OF:?/amba_pl/axi_zxdev0@0:?could?not?get?#dma-cells?for?/amba_pl/flash@60000000
ZXAXI:?zxaxi_of.c:?zxaxi_of_num_dma_nodes:?159:?Device?tree?node?axi_zxdev0:?Unable?to?get?the?'dmas'?property?length.
ZXAXI:?zxaxi_dma.c:?zxaxi_dma_init:?190:?Get?number?of?dma?nodes?error?rc?=?-22.
ZXAXI:?zxdev.c:?zxaxi_probe:?91:?Init?error.
zxaxi:?probe?of?amba_pl:axi_zxdev0@0?failed?with?error?-22
usb?1-1:?device?descriptor?read/64,?error?-71
usb?1-1:?device?descriptor?read/64,?error?-71
usb?usb1-port1:?attempt?power?cycle
usb?1-1:?new?low-speed?USB?device?number?4?using?ci_hdrc
FAT-fs?(mmcblk0p1):?Volume?was?not?properly?unmounted.?Some?data?may?be?corrupt.?Please?run?fsck.
usb?1-1:?device?not?accepting?address?4,?error?-71
usb?1-1:?new?low-speed?USB?device?number?5?using?ci_hdrc
usb?1-1:?device?not?accepting?address?5,?error?-71
usb?usb1-port1:?unable?to?enumerate?USB?device
EXT4-fs?(mmcblk0p2):?re-mounted.?Opts:?(null).?Quota?mode:?disabled.
bootlogd:?/dev/ttyPS0hwclock:?Cannot?access?the?Hardware?Clock?via?any?known?method.
hwclock:?Use?the?--verbose?option?to?see?the?details?of?our?search?for?an?access?method.
Fri?Mar??9?12:43:58?UTC?2018
hwclock:?Cannot?access?the?Hardware?Clock?via?any?known?method.
hwclock:?Use?the?--verbose?option?to?see?the?details?of?our?search?for?an?access?method.
random:?dd:?uninitialized?urandom?read?(512?bytes?read)
INIT:?Entering?runlevel:?5
Configuring?network?interfaces...?macb?e000b000.ethernet?eth0:?PHY?[e000b000.ethernet-ffffffff:07]?driver?[Micrel?KSZ9031?Gigabit?PHY]?(irq=POLL)
macb?e000b000.ethernet?eth0:?configuring?for?phy/rgmii-id?link?mode
udhcpc:?started,?v1.34.1
udhcpc:?broadcasting?discover
macb?e000b000.ethernet?eth0:?Link?is?Up?-?1Gbps/Full?-?flow?control?off
IPv6:?ADDRCONF(NETDEV_CHANGE):?eth0:?link?becomes?ready
udhcpc:?broadcasting?discover
IPv6:?eth0:?IPv6?duplicate?address?fe80::20a:35ff:fe00:b4ee?used?by?00:0a:35:00:b4:ee?detected!
udhcpc:?broadcasting?discover
udhcpc:?broadcasting?select?for?192.168.0.106,?server?192.168.0.1
udhcpc:?lease?of?192.168.0.106?obtained?from?192.168.0.1,?lease?time?6658
/etc/udhcpc.d/50default:?Adding?DNS?192.168.0.1
done.

從日志這邊的信息來看，枚舉過程仍然是有問題的。您聯(lián)系下我們工程師，把圖紙也發(fā)我們看下。

好的，謝謝你的解答，最后請問不同批次的芯片會有區(qū)別嗎？

您好，不同批次的芯片是沒有區(qū)別的。此外，您關(guān)注下是個別硬件有這個問題，還是一個普遍現(xiàn)象？

您好，不同批次的芯片是沒有區(qū)別的。此外，您關(guān)注下是個別硬件有這個問題，還是一個普遍現(xiàn)象？