This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

AM572x GP EVM Bare Metal Startup

Other Parts Discussed in Thread: TMDSEVM572X

I am having real difficulty connecting to the AM572x GP EVM through CCS 6.1.3.

The PMIC,  7 second auto-off makes power-on timing very critical, and the board seems to power off before the gel files can be downloaded.

Is there a procedure that would allow me to get CCS to connect reliably and consistently?

Thanks

  • Please check this wiki: processors.wiki.ti.com/.../AM572x_GP_EVM_Hardware_Setup An important step is to place a jumper on J5. This will prevent the PMIC from powering off.
  • Adding a jumper to J5 did the trick. Thanks.
  • Adding a shunt to J5 disables the 7s timeout, but you need to understand the potential consequences of disabling this timeout.

    The 7s timeout was added to minimize exposure to an issue described in Silicon Errata Advisory i863.

    A boot option was added to silicon revision 2.0 which allows the user to disable internal pull-down resistors on the MMC2 terminals and avoid the issue. However, this option was not implemented on the earlier AM572x GP EVMs even though they contain silicon revision 2.0 devices with this option. All TMDXEVM5728 and TMDSEVM572X revisions earlier than A3a, have the SYSBOOT[15] input pulled low which doesn’t disable the internal pull-down resistors on the MMC2 terminals. You may need to remove R432 and install R197 which pulls SYSBOOT[15] high and install external 47k ohm resistors into positions R250, R251, R252, R253, R254, R255, R256, R257, R258, and R259 if you plan to have power applied to the AM572x GP EVM for long periods of time without software properly initializing the internal pull resistors.

    There is one additional concern with adding a shunt to J5. The Linux image for the AM572x GP EVM contains thermal management code that will automatically turn off power to the AM572x GP EVM if it detects a dangerous junction temperature. When a shunt is installed in J5, software will not be able to power off the EVM and you run the risk of damaging the processor if you are not providing an alternate thermal management solution.

    Regards,
    Paul