[Skiboot] [OpenPower-Firmware] LPC access questions

Daniel M Crowell dcrowell at us.ibm.com
Fri Oct 16 01:18:47 AEDT 2020

Everything is done via MMIO.  See src/usr/lpc/lpcdd.C

Dan Crowell
Senior Software Engineer - Power Systems Enablement Firmware
IBM Rochester: t/l 553-2987
dcrowell at us.ibm.com

From:	"Marty E. Plummer" <hanetzer at startmail.com>
To:	openpower-firmware at lists.ozlabs.org, skiboot at lists.ozlabs.org
Date:	10/15/2020 02:38 AM
Subject:	[EXTERNAL] [OpenPower-Firmware] LPC access questions
Sent by:	"OpenPower-Firmware" <openpower-firmware-bounces
            +dcrowell=us.ibm.com at lists.ozlabs.org>

So, I have a question. When doing LPC reads/writes (lets say to flash
for now, but I suppose this would also apply to the bmc's uart?), are
they done against the 0x6030000000000 mmio address or the 0x9004x scom
addresses? Or does it change depending on where in the ipl process you

OpenPower-Firmware mailing list
OpenPower-Firmware at lists.ozlabs.org

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