[U-Boot-Users] Regarding memory commands

[Herekar, Aniruddha]

Hi,

   Thanks!

 

As you said memory commands work in any memory region, is it only the
internal flash memory or also external flash memory? By external memory
I mean to say that the NOR or NAND memory is not in the processor chip
(ARM). But NOR/NAND memories have separate chip and memory is mapped on
to the ARM memory map.

 

I suppose NAND memory has different command set like nand info, etc.
Then are these (mm, mw, md, etc) commands applicable for NAND memory
also?

 

With regards and thanks

Aniruddha Herekar

 

 

-----Original Message-----
From: S. Egbert [mailto:s.egbert at sbcglobal.net] 
Sent: Thursday, February 09, 2006 11:19 AM
To: Herekar, Aniruddha
Cc: u-boot-users at lists.sourceforge.net
Subject: Re: [U-Boot-Users] Regarding memory commands

 

Herekar, Aniruddha wrote:

> Does memory commands mm, mw, mn and tftp work only with RAM memory and

> not flash (nor or nand) memory?

> 

> If so are there any other commands other than 'cp' that can be used to

> write into flash (nor or nand) memory?

> 

 

Basic memory commands (mm. mw) work in any memory region that the

hardware supports.

 

You will have to be mindful of certain memory and interface devices

using only 16-bit or 8-bit access in a 32-bit architecture.  Otherwise,

such attempts to use 32-bit read/write will result in the most

significant short-word or byte NOT to carry valid data value.

 

TFTP does work writing directly into unprotected FLASH region if the

CFG_DIRECT_FLASH_TFTP is defined in your include/configs/<board>.h file.

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