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DM816x EMAC BOOT dont work

Hi,

i want to use the emac bootmode to load an initial u-boot. I read the "Peripheral Booting" Part in the TechRef-Manual, http://processors.wiki.ti.com/index.php/TI81XX_PSP_U-Boot#EVM_Switch_Settings and set up an the tftp32/64 application for tftp and dhcp. DHCP is working (checked with an Notebook).

If I set the Bootmodes on the EVM to 00100 or 00111 nothing happens. The link state on booth ETH-Ports (J10 and J14) is OK but there is no activity on the DHCP-Server.

Any ideas?

PS: I use an switch between the EVM and my workstation. Is that an problem?