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) [...]
Potential solution is provided in this review: https://reviews.freebsd.org/D30387
Just tried FreeBSD 14.0-CURRENT #6 main-n250192-5bb67f5f3f5: Mon Oct 25 11:36:01 UTC 2021 on my rockpro64, no panic.