How to get in to privilege mode in StarterWare

Sang Mo

Prodigy 40 points

Other Parts Discussed in Thread: AM3358

I use BBB with StarterWare. I want to set CONTROL_CONF_GPMC_CSN(0) regeister, but i can't set it

I think i need get into privilege mode at first.

But I don't know how to do?

Write CPSR like this? Or other

asm("MSR CPSR #0xdf");

Thank you

over 9 years ago

0 Biser Gatchev-XID over 9 years ago

TI__Guru**** 393215 points

Moving this to the Starterware forum.

0 Lalindra Jayatilleke over 9 years ago

TI__Mastermind 30365 points

Sang,

If you take a look at the AM335x PDK, you will notice a privileged mode API at C:\ti\pdk_am335x_1_0_1\packages\ti\starterware\soc\armv7a\gcc\cpu.c

You can get the latest ProcessorSDK RTOS package here.

Here's another thread for reference on a similar question. Hope this helps.

Lali

0 Sang Mo over 9 years ago in reply to Lalindra Jayatilleke

Prodigy 40 points

Hi Lali

Thank you very much!

But i have new problem.

I use API CPUSwitchToPrivilegedMode() , it can change the CPSR. But the PC will jump to 0x00020084. And the code which below the

CPUSwitchToPrivilegedMode() will not be execute.

So I feel confuse.

I saw Martin H. has same probelm. But i still don't know how to make it.

Thank you

0 Sang Mo over 9 years ago in reply to Lalindra Jayatilleke

Prodigy 40 points

I have another project , i don't know why this project CPSR is 11111 ,not 10000 at first.

0 Sang Mo over 9 years ago

Prodigy 40 points

I use am3358 with StarterWare.

I want get into PrivilegedMode , but when i call CPUSwitchToPrivilegedMode(), the prggram will jump to 0x00020084 and the code belwo it will not be performed.

I have seen the manual

It said that can be use at any point of time. But I found it can not use.

if I can't get into PrivilegedMode then i can't set pin mode.

0 Lalindra Jayatilleke over 9 years ago in reply to Sang Mo

TI__Mastermind 30365 points

Sang,
I have merged your other thread with this one since they are dealing with the same query.

What is the mem location where you are checking the value of CPSR?
Are you trying to modify a particular example to get into privileged mode?

Lali

Processors

Processors forum

How to get in to privilege mode in StarterWare