Fix blinky for tangnano4k

[uis246]

And also rename hdmi pins

[yrabbit]

Ignoring the LED on this board is not a mistake, but a precautionary measure: any failure when using the MODE pin as a GPIO can turn your FPGA into a brick, and on this board the LED is just on the MODE pin (10).
The ability to use the MODE pin as a GPIO is not even supported by gowin_pack.
So this board requires external LEDs to be connected, well since we are connecting external LEDs anyway, why 1 and not 6? :)
I don't think renaming these lines is a good idea - it would break some examples.

[uis246]

But my board didn't brick. Only write to flash bricks?

The ability to use the MODE pin as a GPIO is not even supported by gowin_pack.

IDK. Worked for me.

why 1 and not 6? :)
I don't think renaming these lines is a good idea - it would break some examples.

I was thinking about on-board led. Maybe separate cst for blinky with it?

[yrabbit]

But my board didn't brick. Only write to flash bricks?

The ability to use the MODE pin as a GPIO is not even supported by gowin_pack.

IDK. Worked for me.
Now that's a real issue :) We should take a look at the code and fix it.