Hello,
Just to clarify ma question.
I want to access to memory : 0xe00000-0x1000000 which is located on a ISA board.
I don't want Linux to use these adresses, so i need a kind of system exclusion,
perhaps on memory initialisation and I also need to know what virtual adresses
correspond to theses physical adresses.
In my driver, I already try to use char *ptr=0xc0e00000 but it isn't ok.
On my board, these adresses are flash and I know what values I have to find
(0x55 and 0xAA on the first bytes)
every suggestion will be welcomed
regards,
Michel
For the previous suggestions, il don't find any Isa_(read,write) in my system.
Where are they ?
My board is a ISA bord on a 80386 PC and the board memory is directly accessed
from lynx with char * ptr=0xe00c8000 on the same PC, just by Hard disk
switching.
> >
> > Richard Zidlicky wrote:
> > >
> > > On Tue, Apr 04, 2000 at 05:08:22PM +0200, michel wrote:
> > > > Hi,
> > > >
> > > > I'm using a Redhat 6.1 kernel (2.2.12-20), and a ISA board with memory from
> > > > 0xe00000 to 0x1000000.
> > > > I'm writing a driver to this particular board and I'm not able to access to its
> > > > memory.
> > > > A similar driver already work on the same PC with Lynx OS, so it is not a
> > > > question of hardware compatibility.
> > > >
> > > > I try to use adresses 0xc0e00000 to 0xc1000000 directly in my module, but it
> > > > dosen't work.
> > >
> > > use isa_{read,write}
> >
> > isa_xxx is more a tool for easing the transition to newer kernels.
> > Ideally ioremap and read/write[bwl] should be used instead, especially
> > if you are writing a driver from scratch...
>
> hm.. I am no expert at PCI but I am pretty sure that every PCI card/driver
> would break should I try to run it with the in/out/read/write[bw] definitions
> for my Q40 ISA bridge. It has a sparse maping and address translation depends
> on operand size. So I would think keeping ISA and PCI stuff appart would be a
> win. I would actually like to see isa_{in,out}[bw] as well.
>
> Bye
> Richard
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