TDA4VM: How to enable DEBUG symbols in U-Boot

Hi Sami,

There is nothing like a generic CONFIG_DEBUG in u-boot. What specifically
are you planning to look at in the u-boot?

Regards,
Keerthy

Hi Keerthy,

I want to build u-boot with symbols to debug a crash issue in u-boot on j7-evm

I got a u-boot hang here (drivers/ram/k3-j721e/k3-j721e-ddrss.c )

if (wait_for_bit_le32(ddrss->ddrss_ctrl_mmr +
   CTRLMMR_DDR4_FSP_CLKCHNG_REQ_OFFS, 0x80,
   true, 10000, false)) {
   printf("Timeout during frequency handshake\n");
   hang(); 
}

below is the full crash log:

U-Boot SPL 2019.01-g66126341c8 (Feb 21 2020 - 11:16:14 +0000)
SYSFW ABI: 2.6 (firmware rev 0x0013 '19.8.0-v2019.08-3-g8644f (Terri')
Timed out in wait_for_event: status=1000
Check if pads/pull-ups of bus are properly configured
i2c_write: error waiting for data ACK (status=0x0)
Reading on-board EEPROM at 0x50 failed -121
Timed out in wait_for_bb: status=1000
read error from device: 41c8661c register: 0xe!
Timeout during frequency handshake
### ERROR ### Please RESET the board ###

Best Regards

Sami

Hi Sami,

I can see from the traces that DDR frequency handshake is failing.

Can you try the images in the prebuilt binaries folder instead of the binaries that you are building?

Are you facing the above issue with the prebuilt binaries provided in the SDK?

- Keerthy

Hi Keerthy, 

Yes the DDR frequency handshake is failing. it is timing out waiting for REQ bit to clear. I wanted to enable debug and see ddrss 

Yes, I am seeing the same issue with pre-built binaries as well. 

I tried binaries from ti-processor-sdk-linux-automotive-j7-evm-06_01_01_02 

Best Regards

Sami

Hi Sami,

You can try:
#define DEBUG
#undef CONFIG_LOGLEVEL
#define CONFIG_LOGLEVEL 8

in the c file you want to debug.

I believe that is not going to add much value to issue you are debugging this seems like
a very fundamental DDR issue.

May i know the j7 board version that you are facing this issue on?

Regards,
Keerthy

Hi Keerthy,

What is the proper way to add changes in u-boot code and build u-boot in TI yocto build?

I followed this link http://software-dl.ti.com/processor-sdk-linux/esd/docs/latest/linux/Overview_Building_the_SDK.html to build complete SDK. 

Is there any way to add changes in u-boot code in this yocto build environment. 

Yes, I also thinks the same. looks like some DDR / hardware issue. 

Best Regards

Sami

Hi Keerthy,

Thanks that helped in debugging . 

Best Regards

Sami

Hi Keerthy,

I tried building u-boot in ti-processor-sdk-linux-automotive-j7-evm-06_01_01_02/board-support/u-boot-2019.01+gitAUTOINC+66126341c8-g66126341c8

I built using command "make u-boot_spl"

This builds u-boot for a53 and r5.

I want to run on j7-evm. does it require a72 uboot image?

Best Regards

Sami

Thanks , raised a new ticket at https://e2e.ti.com/support/processors/f/791/t/885097