[U-Boot] IO Error Propagation on Armada-385

Hi Stefan and Luka,

I was wondering if you could shed some light on this commit

https://gitlab.denx.de/u-boot/u-boot/commit/501c098a1f2cdaa930cb1a7166d37244...

At $dayjob we're running into an issue where certain invalid PCI accesses when running Linux lead to the CPU hanging. Setting the IO Err Prop bit back to 1 seems to prevent the hang.

Can you recall why u-boot needs this bit cleared? We'll probably need to make the kernel restore the setting but I'd expect the kernel maintainers to point out that we're essentially restoring the hardware default so we'd need to explain that u-boot clears it because X but the kernel needs it set.

Thanks, Chris