[Bug 228340] I/O errors on Intel Denverton eMMC mmcsd0 (0x19db8086)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228340

            Bug ID: 228340
           Summary: I/O errors on Intel Denverton eMMC mmcsd0 (0x19db8086)
           Product: Base System
           Version: 11.1-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: jeromecharles.lallemand at gmail.com

Created attachment 193511
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=193511&action=edit
pciconf -lv + dmesg -a

Hello there,

I'm trying to install FreeBSD on a new device netgate XG-7100. The installer
fail to install due to manies I/O errors.

I've tried with 11.1-RELEASE and 11.2-PRERELEASE.

My dmesg is flooded by these kind of messages:

sdhci_pci0-slot0: mmcsd0: Got AutoCMD12 error 0x0000, but there is no active
command.
sdhci_pci0-slot0: ============== REGISTER DUMP ==============
sdhci_pci0-slot0: Sys addr: 0x00000000 | Version:  0x00001002
sdhci_pci0-slot0: Blk size: 0x00000200 | Blk cnt:  0x0000003e
sdhci_pci0-slot0: Argument: 0x00010628 | Trn mode: 0x00000027
sdhci_pci0-slot0: Present:  0x1fff0000 | Host ctl: 0x00000025
sdhci_pci0-slot0: Power:    0x0000000b | Blk gap:  0x00000080
sdhci_pci0-slot0: Wake-up:  0x00000000 | Clock:    0x00000007
sdhci_pci0-slot0: Timeout:  0x0000000d | Int stat: 0x00000000
sdhci_pci0-slot0: Int enab: 0x05ff003b | Sig enab: 0x05ff003b
sdhci_pci0-slot0: AC12 err: 0x00000000 | Host ctl2:0x0000008d
sdhci_pci0-slot0: Caps:     0x546ec8b2 | Caps2:    0x80000007
sdhci_pci0-slot0: Max curr: 0x00000000 | ADMA err: 0x00000000
sdhci_pci0-slot0: ADMA addr:0x00000000 | Slot int: 0x00000000
sdhci_pci0-slot0: ===========================================
Error indicated: 2 Bad CRC
mmc0: CMD6 failed, RESULT: 1
mmc0: CMD6 failed, RESULT: 1
mmc0: CMD6 failed, RESULT: 1
mmc0: CMD6 failed, RESULT: 1
mmc0: CMD6 failed, RESULT: 1

The system runs smoothly with the custom FreeBSD pfSense.

Is there any way to make the eMMC working ?

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