Regarding X550-AT2, how to get the address for LED behavior from datasheet?

Cody_Kuo · ‎08-31-2023

Hi Sir,

Regarding X550-AT2, how to get the address for LED behavior from X550 datasheet?

I'd like to change LED behavior by hex editor. I know how to modify it, but I don't know how to calculate and get right address. Could you share the process for me?

BR,

Cody

Diego_INTEL · ‎09-06-2023

Hello @Cody_Kuo,

Thank you for contacting Intel Embedded Community.

You must search the BAR0 registers.

LED Control says it is in the offset 0x00000200.

You can modify the bits according to the table 8.2.2.1.10.

I have this example, not exactly for the x550, but I hope this may be helpful.

The vendor identification for an Intel product is 8086h. We search the Device D27, using a decimal to hex calculator:

So, Device 1B and function 00

Using a hex tool like R/W Everything, we have something like this:

In Byte views, 00h will be in the position 01 and 01h will be in the position 00.

And the same for PCI Status:

06h=10h and 07h=00h

Best regards,

@Diego_INTEL