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RE: Bootable NAND flash


I use the SBC104 board, which use pretty much the same components and has
almost the same flash mapping. Unfortunately, the flash chips are disable at
boot time, so even if you write a BIOS extension that you put in your flash,
it won't be scanned at boot time. This would require a modification in the
BIOS to enable it before scanning for extensions.

To solve your problem, I can think of one way to do it: the board comes with
a FlashFx extension in the BIOS, that will recognize a DOS partition in the
flash and boot on it. So, I suggest that you partition your flash with a
small bootable DOS partition where you put syslinux, its config file and the
kernel, and what remains as a jfss/jffs2 partition, that you mount as your
root filesystem using the driver linked in the kernel.

Or, maybe somone from Arcom is listening, who will patch the BIOS to scan
the flash for BIOS extensions... In such a a case, I'll take one!

Michel Stempin
11, parc de Marticot
Tel: +33 (0)5 57 97 72 72
Fax: +33 (0)5 56 78 84 78
Mail: mstempin@xxxxxxx.fr

> -----Message d'origine-----
> De : owner-jffs-dev@xxxxxxx.com]De">mailto:owner-jffs-dev@xxxxxxx.com]De la part
> de Kim Jong-chan
> Envoyé : vendredi 24 août 2001 14:16
> À : jffs-dev@xxxxxxx.com
> Objet : Bootable NAND flash
> maybe This list is not best suitable for my subject. I'm sorry for that.
> I need some advice from the people of this mailing list.
> Any suggestions are welcome.
> Currently, I'm working on NAND work with MediaGX board.
> The point is that I want to boot linux directly from NAND flash.
> Details of my board spec is...
> - MediaGX 300MHz
> - 16MB NAND flash(SAMSUNG K9F2808U0B-YCB0)
>   Data on I/O port 0x310
>   Control on I/O port 0x311
> To be able to boot from NAND flash, I think BIOS modification
> must be done.
> Or, some BIOS extension mechanism is needed just like DOC is doing.
> Today, I'm very surprised to hear something.
> I heard that someone make NAND flash bootable without any
> modification to BIOS. Is it possible?
> If possible, could anyone show me the way to bootable NAND flash
> without any
> BIOS modification or BIOS extension?
> Thank you for your advice in advance. And sorry for my poor English.
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