Remapping vector table in the iMX6

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Remapping vector table in the iMX6

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ogj
Contributor IV

I'm having an issue/misunderstanding on remapping the vector table for the A9 core (iMX6 Quad) in a bare metal (flat mapped) application. I assumed I could create a vector table in some arbitrary location in RAM, load that location into the vbar register:

ldr r0, =vector_tbl
mcr p15, 0, r0, c12, c0, 0 //write VBAR register

and when an interrupt occurred (via the gic/IRQ), control would pass to the IRQ handler. This isn't happening. Control actually passes to the svc handler with the cpu in IRQ mode. I'm pretty sure this is a result of not remapping the vector table correctly. Any guidance on this?

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Qmiller
NXP Employee
NXP Employee

The Remapping vector table code in start.S/vectors.S is not written by nxp. You should post this issue in linux kernel site.And this start code shouldn't have errors.

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ogj
Contributor IV

Got the answer from ARM. The vector table must be on a 32-byte boundary.

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