Run own script during boot process

[Silent90]

Hello.

I am going to add some front-ent to my RPi project - an alphanumeric LCD plus some buttons with UART interface. I am writing a small daemon in C++ to communicate with the LCD, which will be launched after the system startup.

The problem is, that the user interface is "dead" on the powerup, before the Raspbian boots up and the daemon is started (about 30-40 seconds).

Is there a way to send some data over UART during the boot process (1-5 sec. from powerup)? I would like to send some text to the display, for example "Please wait..." or a progrss bar.

[joan]

By default the system displays boot messages to the uart (TXD/RXD, gpios 14/15, P1-8/10). If it's a serial LCD you could display the boot messages I suppose.

[Silent90]

Yeah, driver could analyze it, but it's not exaclty it.
Is there a chanse of running an own program for the ARM core somewhere between the boot steps?

[sprinkmeier]

Hardware solution?
daisy-chain the UART through a PIC or AVR that sends "loading please wait" on power-up and then forwards whatever the Pi sends it.