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List: linux-arm-kernel
Subject: Re: ioremap non-contiguous phys to contiguous virt?
From: Marc Singer <elf () buici ! com>
Date: 2004-10-18 21:26:10
Message-ID: 20041018212610.GC947 () buici ! com
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On Mon, Oct 18, 2004 at 10:11:26PM +0100, Russell King - ARM Linux wrote:
> On Mon, Oct 18, 2004 at 12:34:45PM -0700, Marc Singer wrote:
> > For the sake of the making it easy on the mtd drivers, I'd like to map
> > discontiguous physical memory to a contiguous virtual address space.
> > This hardware layout is an artifact of the design that allows a larger
> > flash device to be used in later implementations.
> >
> > I think that my options are
> >
> > 1) ignore the problem and create a custom maps driver with NO_XIP set.
> > 2) create a custom maps driver, but use the io_table_init mechanism
> > to map the memory contiguously (eeww)
> > 3) find a clever method to do something like this
> >
> > struct memvec mv = { { PHYS0, LEN0 }, {PHYS1, LEN1 } };
> > void* virt = ioremapv (memvec, 2);
>
> 4) use the mtdconcat driver, just like the SA1100 map driver does.
Will this let the jffs2 driver gain linearized access to the array?
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