ld-linker-script: fill bytes between sections

[Josef Angermeier <sijoange@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>]

Hello

Using the ld linker script, you can specify the fill bytes *in* a output
section. but how can i you specify the fill bytes between output
sections. 

An example

sec_a 0x1000 : AT(bla) {
	...
}


sec_b 0x5000 : AT(bla) {
	...
}

sec_a ends depending on its size, somewhere before 0x5000 (where sec_b
starts). now how can you speficy the fill bytes between ENDOF(sec_a) and
0x5000 ??

thanks in advance
josef