TMS320F2800155: Flash Boot Configuration

Anmol Aggarwal

As per the datasheet, GPIO24 and GPIO32 must be connected for device boot-mode selection. However, in our current hardware revision, these pins are not integrated as boot pins—they are instead connected to other peripherals on the board.

Because of this we suspect, we are facing the following issue:

When the device is flashed and powered normally, the controller does not boot up.
The application only runs when the board is connected via CCS debugger and loaded through JTAG.

Given this hardware constraint, we would like to know:

Is there any recommended workaround to force flash boot without relying on GPIO24/GPIO32? Are these really required?
Can boot mode be overridden via software or emulation mode settings?
Could there any other reason for the issue mentioned above, if not the boot pins.

9 days ago

0 MatthewPate 9 days ago

TI__Guru* 82540 points

Anmol Aggarwal said:
Is there any recommended workaround to force flash boot without relying on GPIO24/GPIO32? Are these really required?

No, by default these 2 boot pins are required in order to enter the correct boot mode. Boot to flash requires both pins to be a logical 1(3.3V)

Anmol Aggarwal said:
Can boot mode be overridden via software or emulation mode settings?

Yes, we support changing the boot modes/pins with a modification of the device OTP. Please see this section of the TRM https://www.ti.com/document-viewer/lit/html/SPRUIY4B#GUID-64356F3E-D717-4E9D-A873-8CF00E4B782A/TITLE-SPRUIN7TOCWRAPPER_ROM_CODE_AND_PERIPHERAL_BOOTING

For this customer's case they can change to 0-pin boot, and have it always be flash boot mode. This will ignore the default boot pins and boot properly in their case. They can either use the Flash Tool in CCS to modify these values manually, or they can add a directive

This is a great app note that describes the entire boot flow in addition to the above: https://www.ti.com/lit/ug/sprujh3/sprujh3.pdf

Anmol Aggarwal said:
Could there any other reason for the issue mentioned above, if not the boot pins.

No, if the boot pins are not correctly driven, or modified per the above the device will not boot correctly.

Best,

Matthew

0 Anmol Aggarwal 8 days ago in reply to MatthewPate

Prodigy 10 points

Thanks for the suggestion MatthewPate We will try modifying device otp to resolve our use case.

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TMS320F2800155: Flash Boot Configuration