52235 - moving vector table to RAM

GudeADS — Fri, 12 Jan 2007 21:15:24 GMT

in the sysinit code, the vector table is copied to RAM

/* Copy the vector table to RAM */
if (__VECTOR_RAM != VECTOR_TABLE)
{
for (n = 0; n 256; n++)
__VECTOR_RAM[n] = VECTOR_TABLE[n];
}
mcf5xxx_wr_vbr((uint32)__VECTOR_RAM);

why does it has to like this. I tried to do just
mcf5xxx_wr_vbr((uint32)VECTOR_TABLE);
to use the vector table in flash, but this does not work at all.

I do not need to remap any irq vectors at runtime, so I hoped to use a fixed vector table undestroyable by errounous ram accesses.

Re: 52235 - moving vector table to RAM

PaoloRenzo — Sat, 13 Jan 2007 09:28:07 GMT

Do you try to only erase this "for" cycle and vector base address modification? By default, VBR and FLASH are in 0x0000_0000, so it should work without this copy Vector table from ROM to RAM.

Good luck,

ColdFire/68K Microcontrollers and Processorsのトピック52235 - moving vector table to RAM

52235 - moving vector table to RAM

Re: 52235 - moving vector table to RAM