目前没有使用有时序的电源芯片供电，直接外接的1.1，1.8，3.3V供电，系统可以正常起来。
但是每次断电以后，如果立刻上电，就有很大几率会出现下面这个情况
U-Boot 2013.01.01 (Mar 09 2017 - 10:49:18)
I2C: ready
DRAM: 128 MiB
WARNING: Caches not enabled
Could not probe the EEPROM; something fundamentally wrong on the I2C bus.
Could not get board ID.
NAND: 256 MiB
MMC: OMAP SD/MMC: 0, OMAP SD/MMC: 1
*** Warning - bad CRC, using default environment
musb-hdrc: ConfigData=0xde (UTMI-8, dyn FIFOs, bulk combine, bulk split, HB-ISO Rx, HB-ISO Tx, SoftConn)
musb-hdrc: MHDRC RTL version 2.0
musb-hdrc: setup fifo_mode 4
musb-hdrc: 28/31 max ep, 16384/16384 memory
USB Peripheral mode controller at 47401000 using PIO, IRQ 0
musb-hdrc: ConfigData=0xde (UTMI-8, dyn FIFOs, bulk combine, bulk split, HB-ISO Rx, HB-ISO Tx, SoftConn)
musb-hdrc: MHDRC RTL version 2.0
musb-hdrc: setup fifo_mode 4
musb-hdrc: 28/31 max ep, 16384/16384 memory
USB Host mode controller at 47401800 using PIO, IRQ 0
Net: <ethaddr> not set. Validating first E-fuse MAC
PHY reset timed out
cpsw, usb_ether
Hit any key to stop autoboot: 0
Booting from nand ...
NAND read: device 0 offset 0x280000, size 0x500000
5242880 bytes read: OK
## Booting kernel from Legacy Image at 80200000 ...
Image Name: Linux-3.2.0
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 3351760 Bytes = 3.2 MiB
Load Address: 80008000
Entry Point: 80008000
Verifying Checksum ... OK
Loading Kernel Image ... OK
OK
Starting kernel ...
Uncompressing Linux...
在这里就死了
通过示波器发现Uncompressing Linux...的时候，vdd_core_1.1v有一个5ms的下拉脉冲。
如果断电以后，等待30秒钟左右再上电，则可以正常启动。
请问下这是什么原因引起的，谢谢！
