42E790U-8R98串口打印信息，请教师傅们帮忙分析

武卫

以下是42E790U-8R98串口打印信息，请教师傅们帮忙分析一下，问题出在哪儿？该机故障现象是开机不断重启，插U盘串口TAB键强刷无反应。In:    serial
Out:   serial
Err:   serial
Net:   rtl8139: REALTEK RTL8139 @0xb8016000
Hit Esc or Tab key to enter console mode or rescue linux:  0 ======== Checking into android recovery ====

boot_ac_on=1
#@# do_usb(481) is_usb_ac_on 0
(Re)start USB...
USB0:   #@#  usb3_phy_setting(108) +++ 20130415
#@#  usb3_phy_setting(209) ---
#@#  usb2_phy_setting(214) +++ 20130510
#@#  usb2_phy_setting(294) ---
#@#  usb3_mac_setting(301) +++ 20130510
#@#  usb3_mac_setting(384) ---
Register 5000140 NbrPorts 5
Starting the controller
USB XHCI 1.00
scanning bus 0 for devices... usb_init 120
usb_get_configuration_no: failed to get descriptor - too long: 1045
usb_new_device: Cannot read configuration, skipping device 0c45:6340
USB device descriptor short read (expected 18, got 8)

#@# usb_hub_configure(512) skip the device in usb3 port 5!
usb_init 129
4 USB Device(s) found
       scanning usb for storage devices... 1 Storage Device(s) found
USB transfer timeout on XHCI controller... cannot recover.
BUG: failure at xhci-ring.c:490/xhci_wait_for_event()!
data abort
pc : [<000464dc>]          lr : [<000464d4>]
sp : 000c2190  ip : 0006ffff     fp : c0008383
r10: 00001000  r9 : 0008bb00     r8 : 000ceee0
r7 : 00001000  r6 : 00000001     r5 : 00001000  r4 : 00061040
r3 : 5ff62300  r2 : 5ff62314     r1 : 00000001  r0 : 00000037
Flags: nZCv  IRQs off  FIQs off  Mode SVC_32
Resetting CPU ...

0xb8000804=0x00F00010
0xb8000808=0x00300000
0xb8000810=0x10101010
0xb8000814=0xF0101010
0xb8000818=0x1010101A
  part cfg    : 0x02
  boot cfg    : 0x00
  boot wp sts : 0x00
  boot wp     : 0x00
  part cfg    : 0x01
  boot cfg    : 0x00
  boot wp sts : 0x00
  boot wp     : 0x00
  part cfg    : 0x00
  boot cfg    : 0x00
  boot wp sts : 0x00
  boot wp     : 0x00
boot part idx = 0x00000000

武卫

按串口打印信息提示为USB控制器有问题，是主芯片有问题还是emmc有问题？