Re: [avr-gcc-list] bootloader and irq vectors

[E. Weddington]

Marlin Unruh wrote:

>  I have read the FAQ on 'How do I relocate code to a fixed address?'
>  I have located sections as stated, but not a specific function. What
>  am I missing? Something obvious I fear.
>
>  
My apologies. I thought that it was in the FAQ. I was wrong.

Take a look at the avr-libc user manual, the section on bootloaders:
<http://www.nongnu.org/avr-libc/user-manual/group__avr__boot.html>

Go to the bottom of the page and take a look at the definition of 
BOOTLOADER_SECTION. That is a #define to a "function attribute", which 
is a GCC extension. This particular function attribute will place that 
function in it's own, named section (in this particular case, 
.bootloader). You can then relocate the section to a specific address, 
as described in the FAQ.

Take a look at the GCC user manual about function attributes and 
specifically named sections:
<http://gcc.gnu.org/onlinedocs/gcc-4.0.0/gcc/Function-Attributes.html#Function-Attributes>

There is also a compiler switch that will place *all* functions within 
their own, uniquely named sections, |-ffunction-sections|:
<http://gcc.gnu.org/onlinedocs/gcc-4.0.0/gcc/Optimize-Options.html#Optimize-Options>

HTH
Eric