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

From: E. Weddington
Subject: Re: [avr-gcc-list] bootloader and irq vectors
Date: Fri, 20 May 2005 09:27:11 -0600
User-agent: Mozilla Thunderbird 1.0.2 (Windows/20050317)

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:

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:

There is also a compiler switch that will place *all* functions within their own, uniquely named sections, |-ffunction-sections|:


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