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> I'm also wondering how other people handle applications that will be > stored on a flash, i.e. how they are linked, how data is moved to RAM > etc. That's still for a standalone (no OS) arm-coff application with no > and debug monitor support. Some questions: > > 1. Should I use a separate "loader" program, or have the app do the > load itself? Either one. I've done both in the past. If you've got plenty of flash, I'd lean towards the separate loader program -- IMO it's easier to maintain things that way, and I think it's easier to disaster-recovery stuff into the loader. > 2. Do I need to move the entire program, or just the data section? It depends. I've done it both ways in the past. Running with text/const in ROM is convenient, but often slow. On some platforms RAM is much, much faster than flash ROM. > 3. How can I override the default "start" behaviour (if that's what I > want)? I tried specifying an alternative entry-point via the > linker script, but the start code from crt0.S would still end up > first in the output file (at least, it has the lowest address in > disassembly output.) Tell gcc you don't want start files linked in. IIRC, it's -nostartfiles. > 4. What does "entry point" in the context of linker scripts/linker > options mean anyway? It set's the "entry point" field in the ojbect file. This is used by things like gdb (set's the initial PC value) and objcopy sets the "entry-point" record in hex files . > Does the COFF format know of such a concept, Yes. So do ELF and most hex file formats. > or will it just execute the first instruction found in the file? Depends. To what does "it" refer to your question? Here's a question for you: Why are you using COFF instead of ELF? -- Grant Edwards grante@visi.com ------ Want more information? See the CrossGCC FAQ, http://www.objsw.com/CrossGCC/ Want to unsubscribe? Send a note to crossgcc-unsubscribe@sources.redhat.com
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