请问为什么am335x uboot中无法使用USB？应该如何解决？

本帖最后由 一只耳朵怪 于 2018-6-20 15:12 编辑

公司新设计一个板子，使用开发板上的Uboot，发现U盘在Uboot中无法使用，在Linux中可以正常使用。Uboot中日志如下：
U-Boot SPL 2013.01.01 (Mar 07 2014 - 09:32:19)
mu***-hdrc: ConfigData=0xde (UTMI-8, dyn FIFOs, bulk combine, bulk split, HB-ISO Rx, HB-ISO Tx, SoftConn)
mu***-hdrc: MHDRC RTL version 2.0
mu***-hdrc: setup fifo_mode 4
mu***-hdrc: 28/31 max ep, 16384/16384 memory
USB Peripheral mode controller at 47401000 using PIO, IRQ 0
mu***-hdrc: ConfigData=0xde (UTMI-8, dyn FIFOs, bulk combine, bulk split, HB-ISO Rx, HB-ISO Tx, SoftConn)
mu***-hdrc: MHDRC RTL version 2.0
mu***-hdrc: setup fifo_mode 4
mu***-hdrc: 28/31 max ep, 16384/16384 memory
USB Host mode controller at 47401800 using PIO, IRQ 0
OMAP SD/MMC: 0
reading u-boot.img
reading u-boot.img

U-Boot 2013.01.01 (Mar 07 2014 - 09:32:19)
I2C:   ready
DRAM:  256 MiB
WARNING: Caches not enabled
NAND:  NAND: Unable to find NAND settings in GPMC Configuration - quitting
0 MiB
MMC:   OMAP SD/MMC: 0, OMAP SD/MMC: 1
*** Warning - readenv() failed, using default environment
mu***-hdrc: ConfigData=0xde (UTMI-8, dyn FIFOs, bulk combine, bulk split, HB-ISO Rx, HB-ISO Tx, SoftConn)
mu***-hdrc: MHDRC RTL version 2.0
mu***-hdrc: setup fifo_mode 4
mu***-hdrc: 28/31 max ep, 16384/16384 memory
USB Peripheral mode controller at 47401000 using PIO, IRQ 0
mu***-hdrc: ConfigData=0xde (UTMI-8, dyn FIFOs, bulk combine, bulk split, HB-ISO Rx, HB-ISO Tx, SoftConn)
mu***-hdrc: MHDRC RTL version 2.0
mu***-hdrc: setup fifo_mode 4
mu***-hdrc: 28/31 max ep, 16384/16384 memory
USB Host mode controller at 47401800 using PIO, IRQ 0
Net:    not set. Validating first E-fuse MAC
cpsw, u***_ether
Hit any key to stop autoboot:  0
U-Boot# u*** start
(Re)start USB...
USB0:   lowlevel init failed
USB error: all controllers failed lowlevel init
U-Boot#
请问我应该向什么方向去调试，刚刚接触嵌入式开发，调试一点方向也没有……

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