TM4C123GH6PGE: GPIO output failure under EFT test

Hello,

I'm facing a problem when exposing my board to EFT test.

Pin PA4 is configured as output, driving a logic high signal.

When the Electric Fast Transient is injected into the board, the PA4 pin goes low.

After electric noise removal, I attached the debugger to the running target, and discovered

(surprising) that all PORTA A registers are correctly configured, GPIODATA register have a 1 in the relevant position,

but the pin stays low.

Writing a "1" again into the data register has no effect.

The only way I found to recover from this situation is writing a 0, followed by a 1.

But, this cannot be done runtime, to have no glitches.

While improving PCB layout, does anyone knows

a better way to recover the correct pin status.

Here are GPIOA registers values