Device Tree vs. Device drivers

[Bruce Dawson]

Thanks for replying Thomas!

Basically, I need to store the time (to the sub-nanosecond) on the first
serial interrupt. (Don't need it for every byte, just the first in a
stream.)

I'm not really interested in speeding up the UART code or serial
transfer; I just need to know *exactly* when the first byte comes in (or
goes out).

--Bruce

On Fri, 2014-07-18 at 13:05 -0400, Thomas Charron wrote:
> On Fri, Jul 18, 2014 at 11:45 AM, Bruce Dawson <jbd at codemeta.com>
> wrote:
>         Does anyone have experience with device drivers and how they
>         interact
>         with the new Device Tree methodology?
>         
>         I've got a project using a BeagleBoneBlack and need to modify
>         the serial
>         driver (6530/16550A) for some *very* time critical
>         applications. Plus, I
>         haven't played with the serial driver (or many others) since
>         Linux 0.92
>         and 1.2.xx.
>         
>         Things have changed a lot, and I'm just looking for some
>         guidance/mentor.
> 
> 
>   I'm not sure you're going to get any speed improvements into the
> uart drivers since Intel revamped them to handle DMA and the such..
> 
> 
>   What kind of changes are you talking about?
> 
> 
> -- 
> -- Thomas
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