[avr-libc-dev] [bug #26365] Better PROGMEM_FAR support

[Jan Waclawek]

URL:
  <http://savannah.nongnu.org/bugs/?26365>

                 Summary: Better PROGMEM_FAR support
                 Project: AVR C Runtime Library
            Submitted by: wek
            Submitted on: Mon 27 Apr 2009 09:47:19 PM GMT
                Category: Feature Request
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
        Percent Complete: 0%
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                 Release: Any
           Fixed Release: None

    _______________________________________________________

Details:

It would be nice to see a better support for constant variables placed above
the 64kB limit in those AVRs which do have >64kB FLASH.

This could include one or more of the following:
- inclusion of complete https://savannah.nongnu.org/patch/?6352 of Carlos
Lamas, especially the GET_FAR_ADDRESS() macro
- similar macros for far function pointers, if possible
- a section to the relevant default linker scripts, placed just above the end
of code (.fini0) - maybe called .progmem_far
- a macro hiding usage of the above section, maybe as PROGMEM_FAR, analogous
to the existing PROGMEM macro
- detection of crossing of the 64kB boundary by PROGMEM variables (and other
related data which needs to be positioned at the bottom 64kB)
- better detection of big PROGMEM data initialiser - at the moment, the
compiler throws an error if the initialiser is >32kB, but compiles cleanly
(albeit incorrectly) if the initialiser is >64kB.

Thanks,

Jan Waclawek





    _______________________________________________________

Reply to this item at:

  <http://savannah.nongnu.org/bugs/?26365>

_______________________________________________
  Message sent via/by Savannah
  http://savannah.nongnu.org/