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List:       linux-arm
Subject:    Re: CS4 bus access on SA1110
From:       Russell King - ARM Linux <linux () arm ! linux ! org ! uk>
Date:       2002-09-25 11:31:19
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On Wed, Sep 25, 2002 at 02:00:31PM +0300, Paul Chitescu wrote:
> For more complex accesses (like emulating an ISA or IDE bus) the PCMCIA
> interface is the way to go. This has the advantage it requires no changes in
> drivers other than specifying the right i/o base and irq. A RTL8019 (NE2000
> compatible) network card and an old ISA IDE card worked perfectly this way.

It is also the only region that implements the IOCS16 signal to correctly
stear 8-bit accesses onto the right byte lane.  Without this signal,
there is little way to predict which byte lane you need to read a byte
at an odd address from.

3c575 network cards are one example where accurate ISA bus emulation is
important.

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