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AM6442: Ethernet as backup boot mode on AM64x

Michael Smith
Prodigy 50 points
Part Number: AM6442
Other Parts Discussed in Thread: SK-AM64B

Tool/software:

Hello,

We would like to setup the boot options for the AM6442 with eMMC as primary boot and Ethernet as backup boot. We have been testing on the SK-AM64B evaluation board.

We are able to get Ethernet boot to work as primary boot with the following boot options:

  • BOOTMODE[6:3]: 0100 (Ethernet RGMII)
  • BOOTMODE[9:7]: 001 (Link Info set to 1, i.e. link parameters programmed by software)

When in primary boot mode we are unable to get the SoC to boot if BOOTMODE[7] (Link Info) is set to 0. I've seen in other forum posts that to get primary Ethernet boot to work, Link Info needs to be set to 1.

We then trying to get Ethernet boot to work in backup mode. To do this we set BOOTMODE[9:3] to be SD card (which works) and then removed the SD card so the SoC defaults to the backup boot option.

BOOTMODE[13:10] were set to 0100 but we can't see any BOOTP messages on wireshark.

There is no option for setting link info in backup boot mode.

I'm wondering if we're missing something? And also what link parameters are being set when Link Info is 1 in primary mode?

Thanks,

Michael