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sim: support IVSEL, interrupt vectors in the boot section - #604
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teknoman117 wants to merge 1 commit into
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Bootloaders that use interrupts (Caterina, LUFA CDC/DFU, ...) set MCUCR.IVSEL (GICR.IVSEL on the older megas) to move the vector table to the start of the boot section, and clear it before starting the application. simavr always used the vectors at 0, so such a bootloader ended up in the application's handlers. The bit is declared by DEFAULT_CORE for every core whose avr-libc header defines IVSEL. While it is set, vectors are taken relative to reset_pc, which is where a bootloader is started from (BOOTRST). The IVCE timed sequence is not modelled.
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Bootloaders that use interrupts (Caterina, LUFA CDC/DFU, ...) set MCUCR.IVSEL (GICR.IVSEL on the older megas) to move the vector table to the start of the boot section, and clear it before starting the application. simavr always used the vectors at 0, so such a bootloader ended up in the application's handlers.
The bit is declared by DEFAULT_CORE for every core whose avr-libc header defines IVSEL. While it is set, vectors are taken relative to reset_pc, which is where a bootloader is started from (BOOTRST). The IVCE timed sequence is not modeled.