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AM335x EMAC boot timeout too long

Other Parts Discussed in Thread: AM3352

Hi!

I am trying to implement AM3352 EMAC boot. SYS_BOOT[15:0]=[0100 0000 1000 0111], which means 24MHz, RGMII booting, the sequence is EMAC1->MMC0->XIP->NAND. 

EMAC boot works as expected, but there is still one problem. When DHCP+XINET server is down, AM3352 keeps broadcasting bootp messages to search for the server for around 4 minutes! After that, AM3352 boots from SD/NAND.

My question is: why it takes so long?  Thanks!