retogaeh commented on pull request #3760:
URL: https://github.com/apache/incubator-nuttx/pull/3760#issuecomment-871430001


   > @retogaeh Can you please describe "pretty fast"?
   > Is it in terms of a few ms, hundred ms, few seconds?
   > 
   > Do you think it is abnormal to take so long over SPI?
   > That is, can there be any other latent problem, or it is to be expected?
   > 
   > Finally, can this become a Kconfig, please? As it has a serious effect on 
existing systems.
   
   @fjpanag Sorry for my late response. Regarding whether it is abnormal or 
not: As mentioned in my earlier comment, on a STM32H7 with a 4 GB SwissBit card 
running in single SPI at 25 MHz it takes about 400 ms including some overhead. 
   
   A KConfig option could be a solution. @acassis What do you think about it? 
What should be the default, like it used to be or how it is now? 


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