AM3517 NAND booting

Patrick1

I followed the procedures from this link http://processors.wiki.ti.com/index.php/WinCE-BSP_ARM-A8_User_Guide#Booting_from_NAND_Flash to boot from NAND by flashing from the SD card. I can boot from NAND as long the sd card in in place. If the sd card is removed, it will not boot.

As a test, I renamed the NK from the sd card and the system boots. I am confused as to exactly what it means to boot from NAND, why must the sd card be in place? What might my problem be, where should I look?

Flashing the board through SD card

To flash XLDR/Eboot/nk.bin from SD card,

1. Copy EBOOTND.bin/XLDRNAND.bin/NK.bin to SD card.

2. Enable flashing by select following option from Eboot menu:

    [Flash Management] -> [8]Enable flashing NK.bin

3. Change the SDcard settings for image name to ebootnd.bin/xldrnand.bin/nk.bin from following Eboot Menu:

    [SDCard Settings] -> [Enter Filename]

4. Select boot from SD card:

    [Select Boot Device] -> [NK from SDCard File]

If NK.bin is loaded, after flashing, the program will continue to boot Kernel. If XLDR/EBoot is loaded, reboot is needed.

Please note that since BootROM can only recognize Hamming 1 bit ECC, XLDR should always be flashed in 1 bit ECC mode. Eboot should be flashed in desired ECC mode. When using BCH 4 bit and BCH 8 bit XLDR/EBOOT, please use the following Eboot menu to set to Hamming 1 bit ECC mode:

    [Flash Management] -> [9]Set ECC mode -> 0 (hamming 1 bit ECC)

When switch from betweem ECC modes, it is recommended to erase NAND before the operation.

Booting from NAND

Once the NAND is flashed correctly, change boot switch to select NAND Flash as the boot device and boot the board.

over 13 years ago

0 Tao Zhang over 13 years ago

TI__Expert 4155 points

Hi,

Booting from NAND means XLDR, Eboot are present in NAND device. With the correct DIP switch setting, BootROM should choose "NAND" as boot device and copy XLDR in SRAM and jumping to the XLDR start address after loading . This should work without SD card plugged in. However when NAND boot fails, bootrom will continue to try next available boot device, for example UART, SD, USB etc. (Memory booting device order for each memory booting configuration settings is show in "Table 24-3. Memory Booting Configuration Pins after POR".)

For more details regarding Boot ROM boot sequence, please refer to TRM "24.4 Device Initialization by ROM Code".

Have you flash Xldr and Eboot in NAND? Are the flashing successful?

Thanks,

Tao

0 Patrick1 over 13 years ago in reply to Tao Zhang

Intellectual 370 points

Hi Tao,

"However when NAND boot fails, bootrom will continue to try next available boot device, for example UART, SD, USB etc"

That means my NAND boot is failing, the question is where to look to check for the failure.

"Have you flash Xldr and Eboot in NAND? Are the flashing successful?"

As far as I can tell, YES....., How would I know if the flashing is not successful?

0 Tao Zhang over 13 years ago in reply to Patrick1

TI__Expert 4155 points

Could you please post your log from flashing XLDR/EBOOT?

0 Patrick1 over 13 years ago in reply to Tao Zhang

Intellectual 370 points

See attached

1537.nandboot.txt

0 1258021 over 13 years ago in reply to Patrick1

Genius 5120 points

Hi Patrick,

You have provided the Boot Log. But what Tao is looking for is when you flash XLDR and EBOOT the flashing utility might generate some log on screen.

Looks you haven't flashed the board with XLDR and EBOOT using UART. Follow the stems in the given wiki page to flash binaries (http://processors.wiki.ti.com/index.php/WinCE-BSP_ARM-A8_User_Guide#Booting_from_NAND_Flash)

Can you share that log?

Regards,

GSR

0 Patrick1 over 13 years ago in reply to 1258021

Intellectual 370 points

Hi GSR,

Thanks for the clarification but a bit troubling.

What is troubling about this is that I was following directions from the same wiki.ti link (see my original post) flashing NAND from SD card.....anyway I'll try your link and see where I get.

Does that mean one can not flash NAND from SD?

Thanks

0 Tao Zhang over 13 years ago in reply to Patrick1

TI__Expert 4155 points

Patrick,

From you log, you are using BCH 4 bit ECC.

When you flash XLDR, please make sure you set ECC mode to hamming 1 bit ECC mode, since BootROM only recognize hamming 1 bit ECC.

 [Flash Management] -> [9]Set ECC mode -> 0 (hamming 1 bit ECC)

Thanks,
Tao

0 Patrick1 over 13 years ago in reply to Tao Zhang

Intellectual 370 points

Tao,

Is the way I was flashing OK or not ok? Should it work?

0 Tao Zhang over 13 years ago in reply to Patrick1

TI__Expert 4155 points

Patrick,

It should work. It just need that extra step for XLDR.

Thanks,

Tao

0 Patrick1 over 13 years ago in reply to Tao Zhang

Intellectual 370 points

Hi Tao,

Success......thanks

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AM3517 NAND booting

Flashing the board through SD card

Booting from NAND