[Bug 256822] arm64/rockpro64/13-Rp2/mmc: Instapanic with recoverdisk(1)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256822

            Bug ID: 256822
           Summary: arm64/rockpro64/13-Rp2/mmc: Instapanic with
                    recoverdisk(1)
           Product: Base System
           Version: 13.0-RELEASE
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: arm
          Assignee: freebsd-arm@FreeBSD.org
          Reporter: phk@FreeBSD.org

Fresh install on micro-SD card, freebsd-update'ed to p2:

    root@generic:~ # freebsd-update fetch install
    [...]
    No updates needed to update system to 13.0-RELEASE-p2.
    No updates are available to install.
    root@generic:~ # recoverdisk -v /dev/mmcsd0
    Bigsize = 4194304, medsize = 4194304, minsize = 4194304
    panic: dwmmc_ring_setup: error != 0 (27)

    cpuid = 2
    time = 1617951410
    KDB: stack backtrace:
    #0 0xffff00000050ce7c at kdb_backtrace+0x60
    #1 0xffff0000004b704c at vpanic+0x184
    #2 0xffff0000004b6ec4 at panic+0x44
    #3 0xffff00000085c110 at dwmmc_ring_setup+0x14c
    #4 0xffff0000004ffb88 at bus_dmamap_load+0xf8
    #5 0xffff00000085be24 at dwmmc_next_operation+0x27c
    #6 0xffff00000085c548 at dwmmc_request+0x130
    #7 0xffff000000203ed4 at mmc_wait_for_request+0x128
    #8 0xffff00000020d3f4 at mmcsd_rw+0x1a8
    #9 0xffff00000020bf0c at mmcsd_task+0x284
    #10 0xffff000000467610 at fork_exit+0x88
    #11 0xffff000000823ae8 at fork_trampoline+0x10
    Uptime: 1m33s

    U-Boot TPL 2020.10 (Apr 09 2021 - 04:06:34)
    [...]

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