linux-kernel - Re: What does ISA/PCI really mean to ARM architecture?

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Message-ID: <1356626802.5433.34.camel@anish-Inspiron-N5050>
Date:	Thu, 27 Dec 2012 22:16:42 +0530
From:	anish kumar <anish198519851985@...il.com>
To:	"jonsmirl@...il.com" <jonsmirl@...il.com>
Cc:	Woody Wu <narkewoody@...il.com>, kernelnewbies@...nelnewbies.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: What does ISA/PCI really mean to ARM architecture?

On Thu, 2012-12-27 at 11:22 -0500, jonsmirl@...il.com wrote:
> On Thu, Dec 27, 2012 at 3:27 AM, Woody Wu <narkewoody@...il.com> wrote:
> > Hi, list
> >
> > I know this might be a very basic question.  But I really don't clear at
> > it.
> >
> > Can a peripheral chip that claims to be ISA or PCI device be used in a
> > ARM based embedded system?  For these kind of chips, I only concern
> > about the planar kind of devices, means they are not on a dedicated
> > expansion card.
> >
> > From hardware point of view, to attach a ISA or PCI planar chip, is
> > there any requirement need to fulfill on a ARM board?
> 
> See if your ARM CPU has an interface for SRAM (in addition to DRAM).
> You can use a SRAM chip select to access ISA type devices. But you may
Would you mind explaining this in detail?
> need additional buffers/latches to do this.
> 
> Another solution is to attach you peripherals using USB. Almost all
Connect using USB what does this mean?
> embedded wifi chips are attached this way. The USB connectors aren't
> required, you can route USB around on your PCB. USB hub chips are
> $0.35 if you need more ports.  USB Ethernet chips are available.
> 
> Other options include SPI/I2C. It is worthwhile to investigate these
Only chips which support SPI/I2C can be used but ISA/PCI is completely
orthogonal to this AFAIK.
> serial solutions before doing a parallel solution. Parallel buses eat
> up a lot of PCB space.
> 
> 
> >
> > From Linux driver point of view, what are needed to support an ISA or
> > PCI driver in ARM architecture?  More important, is ISA or PCI device a
> > platform device?  If not, how to add these kind of devices in my board
> > definition?
> >
> > I know my question might not be reasonable enough, if I messed concepts,
> > please sort me out.
> >
> >
> > Thanks in advance.
> >
> >
> > --
> > woody
> > I can't go back to yesterday - because I was a different person then.
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> > the body of a message to majordomo@...r.kernel.org
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> > Please read the FAQ at  http://www.tux.org/lkml/
> 
> 
> 
> --
> Jon Smirl
> jonsmirl@...il.com
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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