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x86 Motherboard Bring-Up

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  • qdrives
    replied
    Your SPI clock does not really looks like a square wave...

    Leave a comment:


  • robertferanec
    replied
    I don't remember exactly, but if it starts reading BIOS, doesn't that mean, that power sequencing was ok?

    Leave a comment:


  • Firasgany7
    started a topic x86 Motherboard Bring-Up

    x86 Motherboard Bring-Up

    I'm in the middle of motherboard bring-up that has Intel Tiger Lake UP3 CPU.

    Seems like I had a good run so far at power-up sequence. here is a list of all power rails \ signals that I already checked and validated that they are HIGH:

    as you see, I still can't get SLP_S5# = High, which means I'm still at the sleep state.

    Note 1: power-up sequence is controlled by an FPGA.

    Note 2: SLP_S0# is connected to 100K PU according to INTEL Platform Design Guide, as opposed to INTEL Validation board that has 100K pull down.I pulled SLP_S0# low from FPGA (now it’s on ~500mv voltage). This change Still didn’t get me to SLP_S5# = HIGH.

    Note 3: I flashed BIOS Binary to BIOS-SPI FLASH AND seems like the SoC is trying to communicate with the SPI Flash but the SoC is not proceeding to higher states:

    SPI_SI_FL (SPI_MOSI)

    SPI_SO_FL (SPI_MISO)

    SPI_CLK_FL (SPI_CLK)

    SPI_CLK_FL (SPI_CLK) – R367 (ZOOM IN)

    here is a schematic for my motherboard for those who have Dropbox account.

    I would like to get some debug ideas that could help checking the source of the problem
    Attached Files
    Last edited by Firasgany7; 06-04-2022, 10:17 AM. Reason: I added a Schematic for those who don't have dropbox account
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