OMAP-L138: the transition to the privileged mode leads to an exception

Tankist

My configuaration:the TMDSLCDK board, the OMAP-L138 processor, CCS 6.0.1, SYS/BIOS bios_6_42_03_35

I try to use quickStartOMAPL1x_rCSL with the ARM core. When I use a part of any ARM example I get an error in each case when I call the following instruction:

_call_swi(ARM_PRIV_MODE_KEY);

This instruction throws an assembler instruction: "SWI #0x50000". It looks well until I realized which code it calls. There are some screenshots which help to understand a situation:

Thi is the start point of the problem.

This is a situation after SWI was called. CPU wants to execute a program at the address 0xC30049A4. What is situated at this address?

Oops! It's a common exception handler!

Why I get an exception handler instead of normal execution of a code?

over 9 years ago

0 Moses Isang over 9 years ago

TI__Expert 8175 points

Hi,
Why are you calling __call_swi(ARM_PRIV_MODE_KEY)? Looks like you're trying to get your application to run in privilege mode? All BIOS code already executes in privilege mode so you don't have to do that.

Rgds,
Moses

0 Tankist over 9 years ago in reply to Moses Isang

Expert 1690 points

Thanks for the reply. I just wanted to get access to some registers and couldn't get it. So I guessed I haven't got an appropriate privileges. But the problem was in MMU settings, not in priveleges. I've already solved it by ajustment MMU in SYS/BIOS confg.

P.S. I can't realize how my topic got into this discussion since I started it in DSP forum. Thougth, there is a link to my post there I solved it:

https://e2e.ti.com/support/dsp/omap_applications_processors/f/42/t/478789

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OMAP-L138: the transition to the privileged mode leads to an exception