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i.MX6 UL - Using the plugin can you write to the GPIO registers

Question asked by Martin Townsend on Jan 30, 2019
Latest reply on Jan 31, 2019 by Martin Townsend

Hi,

 

We would like to assert a GPIO within 300ms of boot but we found that the time it takes to load U-Boot into memory takes longer than this.  The i.MX6 UltraLite Reference Manual states that the DCD can't address the GPIO registers so we can't use this method but there is no mention of allowed address ranges when using the Plugin.  I took a look at the existing plugins in the U-Boot source code and they all write to register address ranges that are only allowed for the DCD.  Does anyone know if any address range restrictions apply to plugins?

 

Many Thanks,

Martin.

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