[U-Boot] CFI: flash_write_cfiword() slow

[Jens Gehrlein]

Hi Wolfgang,

Wolfgang Denk schrieb:
> Dear Jens Gehrlein,
> 
> In message <490EDD63.1010403 at tqs.de> you wrote:
>> find_sector() loops through the sector table from the last sector to
>> the current sector. And the more sectors the device has, the slower
>> the algorithm becomes. And this process for every sector to be 
>> programmed. And yes, there are still devices around without (standard) 
>> write buffer, e.g. the Samsung K8P2815UQB.
> 
> A classic (and  trivial  to  implement)  approach  is  not  to  start
> searching  at  the  end, but at the last used sector (assuming search
> driection and direction of "growth" are  identical). 

Okay. Because I never have seen, that a flash has been written
backwards, as a prerequisite I have to change the loop from counting 
down to counting up. Any objections?

> This  way,  you
> will  typically  find  the  match either immediately or with a single
> step.
> 
> Maybe you want to give that a try...

I'm currently trying :-) Had some other projects in the meantime.

Kind regards,
Jens