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xen-ppc-devel
Re: [XenPPC] [rfc] Serial discovery.
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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