Even for MSP430X, the vector table is placed in near memory (at an address that is specific to the MCU), and the pointers in the table must be to code located in near memory. The compiler automatically adds c16 to any function that has the interrupt attribute, so that these requirements are met. If you have interrupts, you will always have some code in near text.
>From what I see below I'm guessing that you are not using -ffunction-sections and -fdata-sections when compiling, and/or -Wl,-gc-sections when linking. If you do that, then in large memory mode each allocatable object gets placed in its own section, and the linker should put some in low memory and some in high, so the -mcode-region and -mdata-region aren't necessary. However, if you don't have those section flags then everything that is text (data) gets put into one big blob, and things are likely to overflow. http://sourceforge.net/apps/mediawiki/mspgcc/index.php?title=Gcc47:20-Bit_Design#Object_Placement has some discussion of those flags. Peter On Wed, Oct 3, 2012 at 9:01 AM, Valentin Sawadski <valen...@tado.com> wrote: > 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 > > Tel.: +49 - (0) 89 - 416 15 66 4 - 5 > Fax: +49 - (0) 89 - 416 15 66 4 - 9 > Mobil: +49 - (0) 162 - 460 163 4 > www.tado.com > www.facebook.com/tado.com > www.twitter.com/tado > > tado.com ist ein Angebot der tado° GmbH > > tado° GmbH | Kochelseestrasse 8-10 | 81371 München > Geschäftsführer: Christian Deilmann | Johannes Schwarz | Leopold v. 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