[U-Boot] What is CONFIG_HAS_DATAFLASH?

[Detlev Zundel]

Hi Timur,

> Wolfgang Denk wrote:
>
>>> This doesn't tell me anything.
>> 
>> Hm... What exactly don't you understand here?
>
> Well, I was just wondering what the connection is between DataFlash
> (which is some flash technology that I don't know much about) and the
> md command.

A google hit (second one for me) tells more:

http://www.atmel.com/products/dataflash/default.asp

"... sequential access families ideal for program code, data storage,
Serial EEPROM replacement, and the next generation PC Bios Market".

So it does not fit the "put address on a-bus, get contents on d-bus"
model.

>> Why are plain simple memory accesses not possible on your hardware?
>> Which architecture / CPU is this?
>
> Because on this one chip I'm working on, the designers decided to mux
> the LBC address lines with the video signal from the on-board display
> driver.  No, I'm not kidding about that.  That means that when you're
> using the video display, you can't access flash.

Wow, I knew h/w designers are creative, but _that_ creative ;)

Cheers
  Detlev

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