DM355 UBL cannot start u-boot

li li19320

Hi,

I flashed the UBL, u-boot into NAND using nand_programmer in a DM355 board. It is a custom board, those binary files run well in EVMs.

When powered on, UBL finds u-boot and displays the following information in the terminal:"UBL: detected valid U-BOOT magic UBL: booting to U-Boot"

But no more information appears in the terminal. We guess u-boot doesn't run after UBL.

We try to use UBL to start an LED program, but nothing happens as expected. It seems UBL cannot start other programms.

Why UBL cannot start other programs? Is there something to do with the hardware?

Thanks!

Lily

over 13 years ago

0 Kirill Brilliantov over 13 years ago

Genius 3510 points

Hello, li!

Please check UART parameters in U-Boot.

0 li li19320 over 13 years ago in reply to Kirill Brilliantov

Intellectual 290 points

Thanks for your suggestion.

I've checked the UART param in u-boot, it uses the same port as in UBL.

In fact, u-boot and UBL run well in EVMs, but have problem in our custom board. I guess maybe some difference in hardware design causes this problem. But the problem is still not found.

0 li li19320 over 13 years ago in reply to li li19320

Intellectual 290 points

Hi,

In UBL, u-boot is supposed to boot in DMA_IC_FAST mode, because the last 8 bit of its magic number is 0x55.

I change the boot mode to APP_MAGIC_SAFE. u-boot can start up, but stopped after bad table scan.

Does it mean that something is wrong with the NAND device?

Thanks!

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DM355 UBL cannot start u-boot