it is very very strange in UBL/device.c, DEVICE_init()->POR_RESET(). for DM365

YJ Liu

hi all.

I am debuging the DM365 UBL, DVSDK is 4.0 , using UART boot mode. in device.c->DEVICE_init(), we can find it calls POR_RESET(). the POR_RESET() function's code is as following:

void POR_RESET()

{

DEBUG_printString("rstype=0x"); //add by myself

UART_sendHexInt(PLL1->RSTYPE);

DEBUG_printString("QQQ\n");

if ((PLL1->RSTYPE)&3) { //last reset type (in SPRUFG5A.pdf,page44)，=1 means "power on reset"

VPSS_SYNC_RESET(); // VPSS sync reset

*GPINT_GPEN = 0x00020000;

*GPTDAT_GPDIR = 0x00020002;

while(1);

}

After download these code ,i can see the output:

rstype=0x00000001QQQ.

so PLL1->RETYPE=1 (means POWER ON Reset), and if((PLL1->RSTYPE)&3) is true, the cpu runs to while(1);

All I can see is : the CPU reset ,and print "BOOTME" again. why there is a "while(1)"? BUG?

Another question, GPINT_GPEN is defined as "#define GPINT_GPEN (unsigned int *)(0x01C21C08) // WDTspecial function"

we can find out timer2's base address is 0x01c21c00, however ,I cannot find any definition in SPRUFH0.PDF(timer) for offset "0x08" and "0x0C". Anyone can give a tip?

over 13 years ago

0 Constantine over 13 years ago

Expert 2995 points

You can find explanations of this code in chip Errata document.

0 YJ Liu over 13 years ago in reply to Constantine

Expert 1675 points

thank Constantine, I found the code .

it seems a bit difficult for me to debug the initiation. After download the code ,it perform a watchdog reset, and show "BOOTME" again, So I download for the second time?

Any good advice?

0 Marcus Cooksey over 13 years ago in reply to YJ Liu

TI__Genius 9510 points

Are the serial port setting correct on the PC side when performing the command

sfh_DM36x.exe -nandflash ubl_DM36x_nand.bin u-boot.bin

0 YJ Liu over 13 years ago in reply to Marcus Cooksey

Expert 1675 points

constantine is right.My solution is:

1. Build sft without POR_RESET();

So that when burning the flash ,we don't need to use sfh_DM36x.exe twice.

2. Build UBL with POR_RESET().

That will be the real boot code in flash!

Processors

Processors forum

it is very very strange in UBL/device.c, DEVICE_init()->POR_RESET(). for DM365