AM3354 based custom board stuck in boot up from nand

Viral Chavda

Other Parts Discussed in Thread: AM3354

Hi,

I am using my customized board using AM3354 processor and Micron 512MB RAM and ROM. I have modified BSP for my customized board. My Customized board was working fine continuously for last 6 month but suddenly some issue occur and it stop booting. When I checked on console, I found that it is stuck in U-boot nand init print. My customized board booting from NAND.

Observation 1:

I change board boot mode from nand boot to serial boot mode(10010 to 00010), i load u-boot-spl.bin and u-boot.img from serial xmodem it works fine.

Observation 2:

I used XDS100v3 JTAG emulator to debug step by step debug. It was stuck in dead loop and PC at 0x20080. I found that before jumping to dead loop PC was at 0x20004. Also i have checked SYSBOOT line levels it is fine, STATUS register also showing right value.

Observation 3:

I boot up my customized board with serial u-boot, and i did NAND MLO and U-boot.img dump from kernel and compare with my original binary file. There is no difference. So, there is not corruption in nand copy.

Observation 4:

I used XDS100v3 JTAG emulator read DDR3 where u-boot copied by MLO, take a copy and compare with original file, and there is no difference.

Observation 5:

I used XDS100v3 JTAG emulator i load u-boot.img to DDR3 and start free runing it is working fine.

Observation 6:

I checked all PMIC voltages for Microprocessor, DDR3 , NAND and other peripheral and it shows perfect.

Now, i am in trouble, and i am unable to identify problem, Can any one guide me regarding this issue if anyone has same issue, or similar issue of NAND boot up issue.

Any suggestion,

Thanks & Regards

Viral Chavda

over 11 years ago

0 Miroslav Kiradzhiyski XID over 11 years ago

TI__Mastermind 25235 points

Hi Viral,

Did you try to reflash the NAND? What ECC scheme are you using?

Best regards,
Miroslav

0 Viral Chavda over 11 years ago in reply to Miroslav Kiradzhiyski XID

Prodigy 160 points

Hi Miroslav Kiradzhiyski,

Thank you very much, for prompt response,

Ans 1

I have not reflashed NAND because if i do so, i may not be able to reproduce same problem, and will never be able to know the root cause of such a problem.

Ans 2

I am using BCC8 ECC scheme to flash nand.

Thanks & Regards

Viral Chavda

0 Miroslav Kiradzhiyski XID over 11 years ago in reply to Viral Chavda

TI__Mastermind 25235 points

Viral, can you try dumping the MLO and u-boot.img from the NAND flash into binary files and then using the JTAG emulator to load these same files and try to boot with them?

Best regards,
Miroslav

0 Viral Chavda over 11 years ago in reply to Miroslav Kiradzhiyski XID

Prodigy 160 points

Hi Miroslav Kiradzhiyski,

Thanks , I found one bit corruption in u-boot nand image. Now i am wondering why one bit corruption is not handle by nand ecc hw 2. It should be corrected by nand ecc hw 2. Do you have any idea that there is bug of nand bit flip correction?

Regards,

Viral Chavda

0 Miroslav Kiradzhiyski XID over 11 years ago in reply to Viral Chavda

TI__Mastermind 25235 points

Viral, which version of the SDK/PSP are you using? It seems to be quite old because as of PSP version 04.06.00.09-rc2 (U-Boot 2012.10) U-Boot supports only BCH8 by default. No need to set it explicitly using the "nand ecc" command.

I can't comment on whether there is an ECC bug inside previous versions of U-Boot, but I strongly recommend using a more up-to-date version.

Best regards,
Miroslav

0 Viral Chavda over 11 years ago in reply to Miroslav Kiradzhiyski XID

Prodigy 160 points

Hi Miroslav,

Thank you very much, I am using AM335XPSP_04.06.00.07 for my customized board it shows error in ECC correction unrecoverable but when i port AM335XPSP_04.06.00.10 which is not showing such error. That means there is some problem with ECC correction. I will update you once i get root cause. Once again thank you very much.

Thanks & Best Regards,

Viral Chavda

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AM3354 based custom board stuck in boot up from nand