Re: RedHat Toolchain for small chips

On 14/01/14 13:27, Emil Renner Berthing wrote:
> Hi,
> 
> I just tried installing the new toolchain, r206599 from the GCC SVN and the
> latest newlib from CVS.
> However when I try to compile simple programs for small chips it seems just
> the runtime takes up more SRAM than the chip has. Eg.
> 
> $ cat simple.c
> #include <msp430.h>
> 
> static inline void delay(unsigned int n) {
>   __asm__ __volatile__ (
>       "1: \n"
>       " dec %[n] \n"
>       " jne 1b \n"
>       : [n] "+r"(n));
> }
> 
> int main(void) {
>   WDTCTL = WDTPW | WDTHOLD; /* watchdog_off();       */
>   P1DIR |= BIT0;            /* pin_mode_output(1.0); */
> 
>   while (1) {
>     P1OUT |= BIT0;  /* pin_high(1.0); */
>     delay(0xFFFF);
>     P1OUT &= ~BIT0; /* pin_low(1.0);  */
>     delay(0xFFFF);
>   }
> }
> $ msp430-elf-gcc -mmcu=msp430g2231 -Os -static -Wall -Wextra simple.c -o
> simple.elf
> /usr/lib/gcc/msp430-elf/4.9.0/../../../../msp430-elf/bin/ld: simple.elf
> section `.bss' will not fit in region `RAM'
> /usr/lib/gcc/msp430-elf/4.9.0/../../../../msp430-elf/bin/ld: region `RAM'
> overflowed by 16 bytes
> collect2: error: ld returned 1 exit status
> 
> So am I doing something wrong or will it work eventually and I'm just being
> impatient?
> 
> /Emil
> 
> 

You need to generate a map file to see what is /actually/ taking up space:

-Wl,-Map=simple.map,--cref



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