[U-Boot-Users] Multiple flash Support

[Ulf Samuelsson]

> In message <44ED0F52.4060806 at gmail.com> you wrote:
>> 
>> I have a generic question with regards to a  ARM based board: The board
>> in question has capability for 4 or more flashes (mixture of nand,
>> onenand, Nor flashes) all operating at the same time, however, with a
>> dip switch change on the board, the actual flash from which Uboot boots
>> up changes. I do not want to recompile UBoot for each configuration.
>> 
>> Is it possible to have a single UBoot which could boot off each of the
>> flash device? each boot would need to take the environment variable off
>> that specific flash (with configurability to take it off a common
>> location as part of the wishlist).
> 

Maybe this is too late, 
but it may make sense to add an 8 kB serial EEPROM to a board
(which is probably a development board anyway)
and store the environment in this chip.

If you can read the switch, you can make decisions inside your boot.

> Everything is possible. The question is if it makes sense, and if the
> required effort deems acceptable. I tend to answer both of this  with
> no, but YMMV.

I can see a point in the request.
If it is a board that is sold as a development tool, and one of their customers 
wants to download and upgrade the u-boot binary from their website, 
then it is a significant chance that the customer will download the wrong image to the flash memory
This results in a call the support team, which is costly and the customer problem will often reflect on them.


> Best regards,
> 
> Wolfgang Denk
> 
> -- 

Best Regards
Ulf Samuelsson                ulf at atmel.com
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