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TI Home » TI E2E Community » Support Forums » Embedded Software » Linux » Linux forum » How does AM1808 evm Boot ROM search for UBL?
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How does AM1808 evm Boot ROM search for UBL?

How does AM1808 evm Boot ROM search for UBL?

This question is answered
robert chen97444
Posted by robert chen97444
on Mar 21 2012 04:01 AM
Prodigy130 points

Hi,

I use AM1808 EVM.

From my study, I know the boot sequence is:

Boot ROM -> UBL on flash (spi) -> u-boot -> OS

My question is,

1. How  does the Boot ROM search for UBL on flash?

On AM1808 EVM, UBL is put at offset 0 on the spi flash.

Can we move UBL to other offset on the spi flash?

2. If we change the spi flash with one NAND flash in our design, where should we put UBL?

Robert

AM1808 logicPD
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  • Matt Porter
    Posted by Matt Porter
    on Mar 21 2012 07:42 AM
    Verified Answer
    Verified by robert chen97444
    Prodigy210 points

    http://www.ti.com/lit/an/spraba5b/spraba5b.pdf has the answers.

    1. No. Section 6.2 specifies the the AIS image must be located at address offset 0 on the SPI device

    2. AIS goes on block 1. See section 6.4.

    -Matt

     

     

    If this answers your question, please press the Verify Answer button below

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