[U-Boot-Users] Re: [Question About NAND BOOT In SMDK2410

Woodruff, Richard r-woodruff2 at ti.com
Wed Oct 29 04:34:43 CET 2003

There are a few processors which actually can "boot" from NAND.  The
OMAP161x is one such processor.  It has hardware NAND support for ECC and
fetching this along with some microcode in an internal mask ROM (on chip)
can load up and execute code contained in Nand for boot.


There is also a couple "integrated" chips which also allow booting from a
"mainly" a nand device, like disk on chip and SuperNAND.


As for what the SMDK2410 board is capable of, I have no idea.


Richard W.

-----Original Message-----
From: u-boot-users-admin at lists.sourceforge.net
[mailto:u-boot-users-admin at lists.sourceforge.net] On Behalf Of Wolfgang Denk
Sent: Tuesday, October 28, 2003 8:11 PM
To: Rod Boyce
Cc: choigi at samsung.com; u-boot-users at lists.sourceforge.net
Subject: Re: [U-Boot-Users] Re: [Question About NAND BOOT In SMDK2410 

In message <8D7C5F56B409554D9D46AC22195807F3061DD3 at exchwenz01.dmcwave.co.nz>
you wrote:
> What do you have in mind? Boot U-Boot from a Smart Media Card? [Can't
> be done.] 

[Dear Rod, please  stick  with  standard  quotin  rules  -  read  the
Netiquette if necessary.]

> Wolfgang it is code and with code anything can be done I have written code

Arghhh... I have yet to see any processor  that  can  "boot"  (i.  e.
start  fetching instructions out or reset) from an NAND flash device.
So far, all of them need some software to  do  this,  which  must  be
loaded from a _real_ boot device.

> to read and write to a SmartMedia card from an 8051 8-bit micro.  If I had

But I guess the first instruction the 8051 executed  was  NOT  loaded
from  the  SmartMedia card? I guess there was some ROM which you used
as boot device, right?

> need to read a kernel out of SmartMedia then I could do that just as

Please read again what  I  posted.  What  does  "boot"  mean?  Is  it
bootstrapping  a  processor out of the reset condition into some sort
of software (typeically a monitor program  like  U-Boot),  or  is  it
using a bootloader to bootstrap an operating system?

> At 50MHz processor I could even do an effective ECC and still read it out.

Can't be done. It won't start fetching instructions  from  SmartMedia
when you relese the reset pin.

> I have not done this but I can not think of a reason why it cannot be

Think again. Read again. Read before posting, please.

Wolfgang Denk

Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
It is dangerous to be sincere unless you are also stupid.
                                                - George Bernard Shaw

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