Kernel panic by write to console while switching consoles.

Hi all, 

The framebuffer driver for our vga device is working.
But when we tried to boot with the console directing to it, it crashed.
We are running linux 2.4.20 on an embedded MIPS @ 175MHz with a terminal 
attached to a serial port. When we specify "console=tty0" the console is 
switched from the serial console to the framebuffer console when our 
framebuffer driver is loaded.

we found that while switching the console, it is not disabled. The console is 
switched and before it is fully initialzed, something is already printing text 
to it.

when we disabled the console during a switch by setting 
"printable = 0;" at the beginning of "take_over_console.c" in drivers/char.
at the end of "take_over_console" we set it back to 1.

after this we were able to boot and see the pinguin logo with a cursor.
since it is not possible to attach a keyboard we tried 
"echo some text > /dev/tty0" and "some text" does appear at the framebuffer 
console :-).

Did we miss a setting to disable writes to the console while initializing our 
driver?
Is it a bug which only comes forward in combination with a serial console or 
relative slow cpu's?

Greetings,
Jaap van den Handel




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