LEDs

LEDs 0-3 have a fixed role in BoxLambda:

LED #	Name	Description
0	PLL locked	Lights up blue when the system clock PLL is locked.
1	Init Done	Lights up blue when SDRAM initialization has been completed.
2	Init Error	Lights up red when the SDRAM Memory Controller detects an error.
3	SD Card Detect	Lights up green when an SD card is detected in the SD PMOD card slot.

LEDs 4-7 are assigned to the GPIO core. See the GPIO component page.