static initialization does not work with arm-none-eabi
Guest
#2278074
Hello, I moved from arm-elf- to arm-none-eabi- and noticed that a static
variable inside a function would not initialize. A piece of code like:
static uint8_t Config[3] = { 0x87, 0x44, 0x00 } ;
would yield Config[] being { 0x00, 0x00, 0x00 }
That worked with arm-elf ... am I doing something wrong ?
Thank you for help or hints.
Pawel.
And data not explicitly initialized is not set to 0, I assume. Those initializations are part of the startup code linked into the executable. arm-none-eabi usually implies that there is no operating system provided program loader (which normally does this job) and that initialized static data is part of the program data segment, to be copied from ROM to RAM by some startup code which is provided either by the development environment or has to be provided by you. The initialization code depends on definitions within the linker script, so replacing only of them usually fails.
Guest
#2278193
The data appears to be initialized with zeros. Do you mean the arm-none-eabi- compiler does not generate such startup code while the arm-elf compiler would generate it ? Shall I write such code myself ? I don't think the problem is related to EABI or "old ABI". Are both toolchains based on the same version of the gcc sources? Let the linker create a map-file and checked the assigend addresses for the array and the start and end of the .data output-section? If there are still problems please create a minimal but full example with source-code incl. startup-code, linker-script, compiler- & linker-options (pref. in a makefile). ReplyPlease log in before posting. |