C6670 re-latched DEVSTAT after Hard or soft reset !why?

Thank you Raja,

Cuz it said my post  was not successfully posted, so I tried several times. sorry .

I don't know why.I thought there was problem in C66 forum. The issue is urgent. So I went to C64 forum for help, too .

Plz tell me what happened to my account ,thanks !

Hi Raja,
Actually,I had tried both the two sequence before my post here.
1. Please lock the boot configuration register after DEVSTAT value is modified. Then follow the reset sequence.
I have locked as you sequence but DEVSTAT still re-latched.
" Note: Make some delay if needed after locking boot configuration register."
I have make delay in a for loop: 1000 asm(NOP 5);I think it is enough.
Still relatched after execute the " *RegPtr &= 0xFFFEFFFF;" //RSTCFG trig soft reset

Can you have a try and make sure the chip is really works as "not re-latch". I found there are a lot of mismatch between the Datasheet and the device action.

CSL_BootCfgUnlockKicker();
/***************MODIFY DEVSTAT*******************************************/
//modify DEVSTAT for next re-Boot
volatile uint32 *RegPtr;
RegPtr = (volatile uint32*)0x02620020;
*RegPtr = 0x0003964D; //on POR the value is latched as 0x0003960D
CSL_BootCfgLockKicker();

for(i=0;1++;1<1000)
{
asm(NOP 5);
}

//CSL_BootCfgUnlockKicker(); // either Unlock or not has no effection to the below code, verified.
/***************BELOW FOR RESET******************************************/
//RSTCTL Key
RegPtr = (volatile uint32*)0x023100E8;
*RegPtr ^= 0x00005A6A;

//RSTCFG set softreset
RegPtr = (volatile uint32*)0x023100EC;
*RegPtr |= 0x00003000;//also tried hard reset,the value will be 0x00000000

//RSTCTL Key
RegPtr = (volatile uint32*)0x023100E8;
*RegPtr ^= 0x00005A6A;

//delay
for(i=0;1++;1<1000)
{
asm(NOP 5);
}

//RSTCFG trig softreset
RegPtr = (uint32*)0x023100E8;
*RegPtr &= 0xFFFEFFFF;// sadly, after reset ,the DEVSTAT re-latched to value 0x0003960D
//CSL_BootCfgLockKicker(); 

2.Re-boot idea: I have tried also.
Progress: DEVSTAT successfully modified and re-boot from the desired image. But the running is not stable, some cores will abort after some times.
I am sure the image is our released load,very robust load.





Is there any other aspects we have not considered?

Hi Raja,

I have tried on the two ways you suggested to me, but still have problems.

(1)The jump-to-boot method is a good idea, but you know, the system is 4 cores BIOS running,when suddenly jumped to the boot process, cores will abort after sometime.

(2)So I am still work on the reset - method but still DEVSTAT re-latched:

I have locked the boot configuration register after DEVSTAT value is modified,and then I set the RSTCFG and RSTCTL register to trig soft or hard reset.

But I found the DEVSTAT still re-latched, can you please ask your colleagure to have a try on the device?

Is there any other register or operation I have to set?

Thanks!

Hi Frank Deng,

Apologize for the delay. I am working with SoC experts on this issue and will get back to you once I got an update.

Thank you.

Raja said:

Hi Frank Deng,

Are you seeing the soft reset issue in C6670 EVM or custom board? Please confirm. Thank you.

Hi Raja,

I had also tried on the EVM(TMDSEVM6670LE, Rev. 4A), still re-latched,same as my custom board.

Can you experts have a try? And could you check my application code I pasted above?

If unluckly, the hard or soft reset is still re-latch after your test.I have to go to the re-boot method. I then have to deal with the unstable situation.But the question is : before suddenly jump to Boot process when the BIOS system is running, how can I make the device state clear ,such as registers, BIOS and peripherals.That is to say :I have to clear the device as clear as reset. Then the device will run stable after the re-boot.

I am looking forward to your good news!

Thank you so much!

Regards,

Frank

Dear Raja,

Thanks for your update.  Inform me if  any further progress.

I believe that you know my purpose,don't you? I hope your team can provide me workarounds.

Thanks!

Best regards,

Frank

Hi Raja,

I wish you had a wonderful weekends. ：)

I am looking forward to your good news.

Please inform me if the SoC design team had made any progress or not,thank you!

I hope there are workarounds.

Best regards,

Frank