Am335x : MLO not working in u-boot-2016.05

ashu singh

Prodigy 120 points

I'm working on a Custom Board which is working fine with u-boot-2013.10.

Now upgrading U-Boot from u-boot-2013.10 to u-boot-2016.05.

Here are the problem i'm facing:

MLO of u-boot-2016.05 is not detecting i'm only getting "CCCCCCC"
I took reference from AM335x-Evm board for porting.

My doubt is

1. If i use MLO of Am335x-evm board to boot the custom board it should boot but fails at SDRAM init or PLL setting.

But we should get some message after "CCCCCCC" at least U-Boot version, compilation date & time.

2. Is there a version dependency of ROM FW also to detect MLO.

For example if we have a ROM FW of version A for which SRAM address is different and for ROM FW Version B SRAM address is different.

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

I will forward this to the software team. They will respond here.

0 Yordan Kovachev over 8 years ago

TI__Guru**** 161600 points

Hi,

1. Have you ported exactly the DDR configurations, which were working with the previous u-boot version?

2. What were the steps to build the newer u-boot ( u-boot-2016.05)? In SDK3.0, which uses u-boot-2016.05 you should use the "global" make file:
cd ~/ti-processor-sdk-linux-am335x-evm-03.00.00.04
make u-boot_clean
make u-boot

2. Is there a version dependency of ROM FW also to detect MLO.
For example if we have a ROM FW of version A for which SRAM address is different and for ROM FW Version B SRAM address is different.

I am not aware of such dependency.

Best Regards,
Yordan

0 ashu singh over 8 years ago in reply to Yordan Kovachev

Prodigy 120 points

Yes DDR Configurations are same.
I had cloned the TI U-Boot repository git://git.ti.com/ti-u-boot/ti-u-boot.git and working on top of tag ti2016.01
use normal compilation steps which are used to build u-boot.

0 Biser Gatchev-XID over 8 years ago in reply to ashu singh

TI__Guru**** 393215 points

Please be aware that you should not use the TI git repositories. These are for work in progress and are not guaranteed to work. Use only the official downloads from the TI site: www.ti.com/.../PROCESSOR-SDK-AM335X

0 ashu singh over 8 years ago in reply to Biser Gatchev-XID

Prodigy 120 points

I tried with that even though getting same issue.

0 ashu singh over 8 years ago in reply to ashu singh

Prodigy 120 points

I tried with Mainline u-boot also.
Here is my observation

mainline-u-boot-2015.04 -------- Not working
Getting "CCCCCCCCC"

mainline-u-boot-2015.01 -------- Working
U-Boot SPL 2015.01 (Sep 12 2016 - 15:19:59)
Could not probe the EEPROM; something fundamentally wrong on the I2C bus.
Could not get board ID.

The error in 2015.01 is because i'm using am335x-evm image to boot custom board.

My concern is whatever the custom board we have it has to show "U-Boot version, build timing, etc" when we are using am335x-evm image because SOC initialization code will remain same till Clock, SDRAM init.

0 Yordan Kovachev over 8 years ago in reply to ashu singh

TI__Guru**** 161600 points

Hi,

Can you add
#define DEBUG
in your am335x-evm.h & share the output shown in your debug terminal? This might help in seeing where exactly your MLO is stuck..

Best Regards,
Yordan

0 ashu singh over 8 years ago in reply to Yordan Kovachev

Prodigy 120 points

Tried that even after enabling DEBUG there is no message apart from "CCCCCCC"

0 Yordan Kovachev over 8 years ago in reply to ashu singh

TI__Guru**** 161600 points

Hi,

Have you tried adding the DDR configurations from AM335x GEL files in ti2016.01 sources?

Also have you checked the MLO differences between mainline-u-boot-2015.01 & ti2016.01? Sources are located in arch/arm/cpu/armv7/am33xx/

Best Regards,
Yordan

0 ashu singh over 8 years ago in reply to Yordan Kovachev

Prodigy 120 points

Hi,

DDR configuration are correct as with the same configuration it is working on u-boot-2013.10.

what is weird for me even before initializing DDR(if there is some problem with DDR settings), SRAM based code should execute.

Here lowlevel code is not executing in 2015.04 onwards.

0 Yordan Kovachev over 8 years ago in reply to ashu singh

TI__Guru**** 161600 points

How do you build your u-boot? Maybe you use the wrong configuration file..
In latest u-boots (i.e. in SDK03.00.00.04) it is best to use the top level makefile & execute:
make u-boot
The build script will compile the u-boot with the correct environment variables & config file.

Best Regards,
Yordan

0 ashu singh over 8 years ago in reply to Yordan Kovachev

Prodigy 120 points

I use make all (To build all required components)

since make u-boot will only build bare u-boot.

0 user4935384 over 8 years ago in reply to ashu singh

Prodigy 90 points

Hi,I have the same problem now, how did you solve it?Thanks.

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Am335x : MLO not working in u-boot-2016.05