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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/112944] AVR: Support .rodata in Flash for Devices with
 FLMAP
Date: Mon, 12 Feb 2024 11:04:41 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112944

--- Comment #4 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Georg-Johann Lay <gjl@gcc.gnu.org>:

https://gcc.gnu.org/g:525cfe1e9554858366e7811aa9e437357c0f272e

commit r14-8926-g525cfe1e9554858366e7811aa9e437357c0f272e
Author: Georg-Johann Lay <avr@gjlay.de>
Date:   Mon Feb 12 11:10:48 2024 +0100

    AVR: target/112944 - Addendum: Link code to initialize NVMCTRL_CTRLB.FL=
MAP

    For devices that see a part for the flash memory in the RAM address spa=
ce,
    bit-field NVMCTRL_CTRLB.FLMAP must match the value of symbol __flmap.
    This is achieved by dragging in startup code from lib<mcu>.a.
    The mechanism is the same like for libgcc's __do_copy_data and
__do_clear_bss.
    The code is implemented in AVR-LibC #931 and can be dragged by referenc=
ing
    __do_flmap_init.

    In addition to setting FLMAP, that code also sets bit FLMAPLOCK provided
    symbol __flmap_lock has a non-zero value.  This protects FLMAP from fut=
ure
    changes.

    When the __do_flmap_init code is not wanted, the symbol can be satisfie=
d by
    linking with  -Wl,--defsym,__do_flmap_init=3D0

    gcc/
            PR target/112944
            * config/avr/gen-avr-mmcu-specs.cc (print_mcu) [have_flmap]:
            <*link_rodata_in_ram>: Spec undefs symbol __do_flmap_init
            when not linked with -mrodata-in-ram.=