Re: [PATCH v2 2/2] via-ide: Fix fuloong2e support

[Mark Cave-Ayland]

On 28/12/2020 20:50, BALATON Zoltan via wrote:

> I think leaving the legacy ports enabled is a bad idea for at least two reasons: 1) 
> It may clash with other io ports on other machines, e.g. I'm not sure on PPC where 
> firmware or OS does not expect to see legacy ISA ports won't map some io BAR of a PCI 
> card there. 2) If this is left enabled there would be two ports poking the same 
> registers so if that does not cause a problem by itself, writing to one accidentally 
> (like when something is mapped over it) could cause corruption of IDE state so I 
> think it's much better to protect this than later trying to debug such problems.

Legacy ioports originate in the x86 world, however all the PCI bus enumeration code 
I've seen reserves the lower part of the IO address space to prevent such problems 
with e.g. a BIOS starting up in legacy mode.


ATB,

Mark.