[Bug 205356] Minnowboard Max boot delayed by 12 x 10 second sdhci_pci2 timeouts

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205356

            Bug ID: 205356
           Summary: Minnowboard Max boot delayed by 12 x 10 second
                    sdhci_pci2 timeouts
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: emaste at freebsd.org

Booting a fresh -CURRENT image on Minnowboard Max is delayed for 2 minutes by
sdhci timeouts from (the seemingly unused) sdhci_pci2.

Timeouts messages:

sdhci_pci2-slot0:  Controller timeout
sdhci_pci2-slot0: ============== REGISTER DUMP ==============
sdhci_pci2-slot0: Sys addr: 0x00000000 | Version:  0x00001002
sdhci_pci2-slot0: Blk size: 0x00000000 | Blk cnt:  0x00000000
sdhci_pci2-slot0: Argument: 0x00000000 | Trn mode: 0x00000000
sdhci_pci2-slot0: Present:  0x1fff0001 | Host ctl: 0x00000001
sdhci_pci2-slot0: Power:    0x00000000 | Blk gap:  0x00000080
sdhci_pci2-slot0: Wake-up:  0x00000000 | Clock:    0x0000fa07
sdhci_pci2-slot0: Timeout:  0x00000000 | Int stat: 0x00000000
sdhci_pci2-slot0: Int enab: 0x01ff00fb | Sig enab: 0x01ff00fb
sdhci_pci2-slot0: AC12 err: 0x00000000 | Slot int: 0x00000000
sdhci_pci2-slot0: Caps:     0x446cc801 | Max curr: 0x00000000
sdhci_pci2-slot0: ===========================================

pciconf -lv shows these three sdhci_pci devices:

sdhci_pci0 at pci0:0:17:0: class=0x080501 card=0x72708086 chip=0x0f158086 rev=0x0c
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Atom Processor Z36xxx/Z37xxx Series SDIO Controller'
    class      = base peripheral
    subclass   = SD host controller
sdhci_pci1 at pci0:0:18:0: class=0x080501 card=0x72708086 chip=0x0f168086 rev=0x0c
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Atom Processor Z36xxx/Z37xxx Series SDIO Controller'
    class      = base peripheral
    subclass   = SD host controller
sdhci_pci2 at pci0:0:23:0: class=0x080501 card=0x72708086 chip=0x0f508086 rev=0x0c
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Atom Processor E3800 Series eMMC 4.5 Controller'
    class      = base peripheral
    subclass   = SD host controller

The micro-SD slot on the MB Max is attached to sdhci_pci1, and it works.

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