Re: [XenPPC] [rfc] Serial discovery.

[Jimi Xenidis <jimix@xxxxxxxxxxxxxx>]

On May 4, 2006, at 7:54 AM, Maria Butrico wrote:

> The ns device driver is shared between ia and ppc (and who knows  
> what else).    What concerns me more is the way in which inb/outb  
> is selected and furthermore the fact that up to now on ppc we have  
> been using the emulated inb/outb and with my changes we would start  
> using readb/writeb exclusively.
The NS driver assumes that if the io_base > 0x10000 (the 16-bit limit  
of ISA) then it must be an absolute address, and therefor has to be  
ioremap()ed and accessed with the read*() interfaces that use  
absolute addressing.
Not sure if we'll ever see a Zilog off an ISA, we certainly could.
It is way more likely that we'll all see an NS not on ISA :).

Hollis objects to removing the inb/outb, I don't feel as strongly so  
I guess we can keep it.
>   Do I hear consensus on doing away with inb/outb for zilog?
I'd simply keep zilog ioremap()ed, readb()/writeb() and the first  
person who sees it on an ISA can add that logic, but feel free to  
repeat the NS logic if you wish.
-JX

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