Update led.md

led.md

@@ -59,3 +59,7 @@ binary blobs so modifying them or porting a new platform is extremely time consu
 The address `0x3800` is called `CUSTOM_HANDLER_ADDR`. You can find the source code for making your own custom LED code in the [OpenBCM](https://github.com/Broadcom-Network-Switching-Software/OpenBCM/tree/master/sdk-6.5.27/tools/led/cmicx) ([backup](https://github.com/bluecmd/OpenBCM/tree/master/sdk-6.5.27/tools/led/cmicx)) repository.
 
 [SONIX](https://sonix.network/) publishes their custom LED code [at github](https://github.com/sonix-network/broadcom-leds).
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+## Innovium Teralynx 7 LED driving
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+The IVM77700 communicates directly with two CPLDs in order to drive LED status. What type of protocol it uses and how it determines the port split between them is unknown.