sd卡烧写nand时打印信息
U-Boot SPL 2013.01.01-00123-g2830d15-dirty (Apr 16 2015 - 22:17:03)
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
sd卡烧写nand时，打印到这里就挂了，这是什么原因啊