Hi everybody,
I'm trying to get a nontrivial program working with the 20bit MSP430X
extension. While lots of it is working perfectly I'm currently confused
with the size of my vector table.
I'm compiling and linking with -mmemory-model=large -mcode-region=far. As I
understand it any code should then be placed in far memory. But when
Programming the device I see 128bytes written to 0xff80 so I'm guessing my
vector table is still using the 16bit pointers.
If however I remote the -mcode-region=far I receive the following errors:
/opt/compiler/mspgcc-20120911/lib/gcc/msp430/4.7.0/../../../../msp430/bin/ld:
node-main.tado-box section `.rodata' will not fit in region `rom'
/opt/compiler/mspgcc-20120911/lib/gcc/msp430/4.7.0/../../../../msp430/bin/ld:
section .vectors loaded at [000000000000ff80,000000000000ffff] overlaps
section .rodata loaded at [000000000000f824,000000000000ff81]
/opt/compiler/mspgcc-20120911/lib/gcc/msp430/4.7.0/../../../../msp430/bin/ld:
section .data loaded at [000000000000ff82,000000000001015b] overlaps
section .vectors loaded at [000000000000ff80,000000000000ffff]
/opt/compiler/mspgcc-20120911/lib/gcc/msp430/4.7.0/../../../../msp430/bin/ld:
section .far.text loaded at [0000000000010000,0000000000019a0b] overlaps
section .data loaded at [000000000000ff82,000000000001015b]
/opt/compiler/mspgcc-20120911/lib/gcc/msp430/4.7.0/../../../../msp430/bin/ld:
region `rom' overflowed by 476 bytes
collect2: error: ld returned 1 exit status
make: *** [node-main.tado-box] Error 1
Can somebody shed some light into that as I'm not sure I understand the
consequences of 20bit pointers and the compiler switches, even after
reading the very helpful wiki page on them (
http://sourceforge.net/apps/mediawiki/mspgcc/index.php?title=Gcc47:20-Bit_Design
)
Best Regards,
--
Valentin Sawadski
Head of Embedded Hard- and Software
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