DRA756: How to boot from nandflash in dra756

dengwenwu

Prodigy 115 points

Part Number: DRA756

Hello

TI experts.

We currently work on our custom board based on DRA756, with VisionSDK3.07, running linux on A15.

We have successfully boot from sd-card and emmc, but now we want to boot from nandflash(256MB).

Noticed that http://processors.wiki.ti.com/index.php/Processor_SDK_Linux_Automotive_Software_Developers_Guide, there is no tips about nandflash boot, but in the trm it is said that the SOC supports booting from nand.

So I want to know if there is any examples I can use to boot from nand.

And I have tried in linux with flash_erase and nandwrite to write the MLO and uboot.img to /dev/mtdxx, but I failed.

Q1: how to fix thsi error when using flash_erase?

Q2: I have serached in e2e, some said they can flash nandflash in uboot, but I noticed that the uboot in VSDK3.07 didn't have commands about nand operation, when I try to modify the u-boot, the compilation also terminated with error, it seems the nand-command operations have been dropped from uboot2016.05.

So, would you like to help me to solve the above questions?

Thx.

over 6 years ago

0 Yordan Kamenov over 6 years ago

TI__Mastermind 42515 points

Hi,

can you check if you can find some directions in this document:

Regards,

Yordan

0 dengwenwu over 6 years ago in reply to Yordan Kamenov

Prodigy 115 points

Yes, I have checked this document.

But it seems the u-boot in PSDKLA doesn't support nand-operations.

0 dengwenwu over 6 years ago in reply to Yordan Kamenov

Prodigy 115 points

And I have seen in this link:

http://e2e.ti.com/support/processors/f/791/t/716010?tisearch=e2e-sitesearch&keymatch=tda%252520nand%252520boot

Linux/TDA2P-ACD: NAND Flash Configiration in U-boot for TDA2p device

and TI experts

Srirama Govindarajan

said:

Swapnil
Does NAND support need to be enabled both in uboot(especially if it is your boot media) and also from the kernel(root filesystem from NAND - UBIFS based)
We had enabled NAND boot support on DRA71x - and you can refer to patches in uboot, kenel as a reference.

So, would you like to tell me how to find the above patches? I haven't found them yet.

thx

0 David Huang over 6 years ago in reply to dengwenwu

TI__Intellectual 2440 points

Hello,

Please check this thread for u-boot patches: https://e2e.ti.com/support/processors/f/791/t/618242. I don't believe we've ever ported these to 3.07

Your u-boot doesn't seem to have NAND operations like nand read/dump/write? Are you using u-boot from VSDK 3.07 or a PSDKLA release?

Can you clarify, do you want to boot from NAND only, are you planning to have filesystem on NAND as well?

Thanks,

David

0 dengwenwu over 6 years ago in reply to David Huang

Prodigy 115 points

I just want to boot from NAND, and filesystem will locate in eMMC.

And currently I have re-configure the uboot, and now the nand operations can be seen, but it doesn't work well.

And thank you for providing the patches, I will try and give you feedbacks later.

Thank you very much.

0 Yordan Kamenov over 5 years ago in reply to dengwenwu

TI__Mastermind 42515 points

Hi @dengwenwu ,

do you have any progress on this issue?

Reagrds,

Yordan

Processors

Processors forum

DRA756: How to boot from nandflash in dra756

Linux/TDA2P-ACD: NAND Flash Configiration in U-boot for TDA2p device

Srirama Govindarajan