Allegedly a "Marvell Armada 3700 Functional Errata, Guidelines, and

Allegedly a "Marvell Armada 3700 Functional Errata, Guidelines, and
Restrictions" document exists that discusses an errata #251 in section
"3.12 PCIe Completion Timeout" and suggests that setting the DIS_ORD_CHK
flag in the Debug Mux Control register is necessary as a workaround:

https://lore.kernel.org/linux-pci/20210624222621.4776-6-pali@kernel.org

This workaround is still being discussed by the Linux developers, but it
does fix an issue I am seeing with athn(4), where an external abort
happens under load.  So apply this workaround since its potential side
effects seem to be significantly less severe than provoking an
external abort that hangs the machine.

ok patrick@