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EK-TM4C1294XL的uip例程 问题

Other Parts Discussed in Thread: EK-TM4C1294XL

在EK-TM4C1294XL的uip例程里有一句:

while((MAP_EMACPHYRead(EMAC0_BASE, 0, EPHY_BMSR) & EPHY_BMSR_LINKSTAT) == 0) // Wait for the link to become active. //

                 {;}//Link Established.

当网口没插时,程序就死在这里了,后面的程序就执行不了了,必须得等待插网线,请问屏蔽掉这句程序有什么问题吗?