Attention is currently required from: Nico Huber, Michał Żygowski, Paul Menzel.

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1 comment:

• File ite_ec.c:

  • Patch Set #13, Line 78: struct ite_string {

    L140CU signatures:
    eflash: A5 A5 A5 A5 A5 A5 A5 94 85 12 5A 5A AA 00 55 55
    spi: A5 A5 A5 A5 A5 A5 A5 95 85 12 5A 5A AA 7F 55 55

    
    Some details on the signature:

    Mirroring is done from external SPI flash to eFlash.
    There's a "mirror once" or "always mirror" feature, controlled by the FW.

    A5 A5 A5 A5 A5 A5 TT UU 85 12 VV WW AA XX YY ZZ

    TT:   bit 0: eSPI/LPC mode
            0: eSPI -> TT=A4
            1: LPC  -> TT=A5

    UU:   bit 7: PWM blinking during mirroring
            0: enable
            1: disable
          bit 6: use internal clock until external crystal is ready
            0: disable
            1: enable (only valid when bit 4 = 0)
          bit 5: FSPI mirror function
            0: enable (XX must be set)
            1: disable (XX must be AA)
          bit 4: 32.768 kHz source
            0: external crystal
            1: internal OSC, crystal-free mode
          bit 3: ec code base mode
            0: implicit - YYZZ must be 5555
            1: explicit
          bit 2: CRC-16 check after mirror
            0: enable, VVWW must be CRC-16 of mirrored region
            1: disable
          bit 1: must be 0
          bit 0: PWM selector for blinking
            0: PWM0
            1: PWM1

    XX:   mirror size if mirror enabled: XX = (size - 1); e.g. 128k = 7F
          must be a multiple of 4k
          else AA

    VVWW: CRC-16 of mirrored region, if CRC enabled; else 5A 5A

    YYZZ: 5555 if implicit format used or signature on e-flash (code base is
          the start of the 4k block, where the signature is located)
          else if explicit format: YYZZ = BASE[23:12]

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