Re: Linuxbios with Diskonchip?

[Devi Priya]

Hi,
    Thanks for ur suggestion. I want to know to which CPU address does the DOC 
Millennium is mapped?
> From: Niki Waibel 
> Reply-To: Niki Waibel 
> To: Devi Priya 
> CC: [e-mail], gizara 
> Subject: Re: Linuxbios with Diskonchip?
> Date: Fri, 28 Nov 2003 09:18:31 +0100 (MET)
>
> the doc millennium "maps" the first 2 pages of the NAND flash into its high 
> and low address space.
> it _can_ be used to boot/init memory/copy nand pages to ram/jmp to ram.
> but -- you have to do all that within 512 bytes of code.
>
> mem layout of the doc millennium (2001) is:
> address
> 0x0000 512bytes boot code (first 2 pages copied during power on via a reset 
> mechanism)
>        512bytes boot code (mirror)
>        512bytes boot code (mirror)
>        512bytes boot code (mirror)
> 0x0800 512bytes flash area window
>        512bytes flash area window (mirror)
>        512bytes flash area window (mirror)
>        512bytes flash area window (mirror)
> 0x1000 512bytes control registers -- not all 512bytes used
>        512bytes control registers -- not all 512bytes used (mirror)
>        512bytes control registers -- not all 512bytes used (mirror)
>        512bytes control registers -- not all 512bytes used (mirror)
> 0x1800 512bytes boot code (first 2 pages copied during power on via a reset 
> mechanism)
>        512bytes boot code (mirror)
>        512bytes boot code (mirror)
>        512bytes boot code (mirror)
>
> i'd like to get this working on a via epia-m motherboard once.
> replacing the existing bios.
>
> niki
>
> On 27-Nov-2003 gizara wrote:
> > If I remember correctly, Disk-on-Chip comprises NAND flash technology
>
> which
> > inherently cannot execute in place, strictly sequential (data)
>
> accesses...
> > So you would still need some sort of rudimentary boot flash(NOR) or
>
> other
> > ROM to execute code to first load the BIOS, then the kernal, into
>
> shadow,
> > then main (DRAM) memory locations, respectively.
> >
> > In a system I'm architecting we're still going to use a 256Kx8 flash for
> > LinuxBIOS, from there use JFFS2 and associated utilities to get the
>
> kernal
> > and various applications and data from a bare NAND on board.
> >
> > This link and its links go into much more detail than I can in this
>
> email
> > about issues you may face:
> >
> > http://www.linux-mtd.infradead.org/tech/nand.html
> >
> > Good Luck!
> >
> > ----- Original Message -----
> > From: "Devi Priya" 
> > To: 
> > Sent: Wednesday, November 26, 2003 10:47 PM
> > Subject: Linuxbios with Diskonchip?
> > > Hi,
> > >
> > > I shall have my BIOS program, Linux kernel and filesystem in the same
> > > Diskonchip. I want to use linuxbios (for sc1200).  What is the physical
> > > memory mapping that should be done? SDRAM mapped to lower order address
> >
> > and
> > > Diskonchip to the higher order address. Is it correct?
> > >
> > > Enjoy shopping online? Get this e credit card.
> > > http://server1.msn.co.in/features/amex/ It cuts cost & adds value!
> > >
> > > Linuxbios mailing list
> > > [e-mail]
> > > http://www.clustermatic.org/mailman/listinfo/linuxbios
> >
> > Linuxbios mailing list
> > [e-mail]
> > http://www.clustermatic.org/mailman/listinfo/linuxbios

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