1. Linux never uses any memory or even addresses in the range from 640K to
1 MB so there's nothing special you have to do to use it.
2. I found that I had to use (2.0.36/0.9J)
pointer_to_use = vremap( physical_address , size );
and I thing that in 2.2.x the function is called ioremap().
Norm
> -----Original Message-----
> From: [EMAIL PROTECTED] [SMTP:[EMAIL PROTECTED]]
> Sent: Monday, September 27, 1999 10:52 PM
> To: [EMAIL PROTECTED]
> Subject: [rtl]ISA programming
>
> Dear all:
>
> I have two fundamental questions about ISA card share memory programming
> on RT-Linux.
>
> Our ISA card uses a dual port ram (DPR) and an IRQ to communicate with
> computer system. The DPR has a programmable basic address, now it is set
> to 0XC8000 and the memory range from 0XC800:0000 to 0XC800:FFFF.
>
> I want to use a real-time task to communicate with this ISA card through
> DPR.
> Now are my questions trouble me:
> 1. Is it necessary to reserve this memory window to prevent system use it?
>
> 2. If it is necessary, how can I do?
>
> Regards
> Leo
>
>
>
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