Questions about ioport-assignments
linux at dominikbrodowski.net
Mon May 10 12:42:52 EDT 2010
On Sun, May 09, 2010 at 09:11:15PM +0900, Komuro wrote:
> > >>- Is it just a buggy card if it works at 0x300 but not 0xc300
> > >> (or is it maybe a problem with Linux assigning the io area)?
> > >>- Why is IOAddrLines forced to 16 (and thus alignment to 0x10000), but onl
> > >> if BasePort1 is 0?
> >In this case,
> >start = 0xc000,
> >align_data->mask = 0x3ff,
> >align_data->offset = 0x300
> >then ret becomes 0xc300;
> >but ret should be 0x300.
> "pci_find_parent_resource" only finds the io-window of cardbus bridge.
It only finds IO windows which also the parent Cardbus bridge can see.
However, other IO areas (even if they are added by pmcia-socket-startup) may
not be "seen" by the parent Cardbus bridge. Thus they may not be available
for use, even for PCMCIA. THerefore, the current behaviour seems proper.
More information about the linux-pcmcia