[ECOS] MIPS32 4Kc - Interrupt enable and base address for exceptions

[Elad Yosef <elad dot yosef at gmail dot com>]

Hi,
MIPS32 4Kc has 2 base addresses for exceptions
bootstrap - 0xBFC00000
normal -     0x80000000

The selection of the base address is by BEV bit in the status register.

In the Boot stage it makes sense that the BEV will select the bootstrap.
but when the application is running from RAM i want it to use the
normal base (mapped to my RAM)

My RedBoot works fine, downloads the application by tftp to RAM and jumps to it.

My application init code is also running well, until the exit from
"cyg_user_start".

The eCos default - Is that point the scheduler goes to action and
interrupts are enabled.

At that point I see that my CPU still using the bootstrap base for
exceptions/interrupt.
which leads to unexpected results.

My question is- Is there some configuration option i need to select in
order to use the "normal" base?

In case there isn't such, At which point on the code should I set the
BEV in the status register?

Thanks

Elad

-- 
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss