[L] Change in coreboot[main]: drivers/ipmi: add Block Transfer (BT) interface

[Sergii Dmytruk (Code Review)]

Attention is currently required from: Christian Walter, Jonathan Zhang, Krystian Hebel, Martin L Roth, Martin Roth, Michał Żygowski, Sergii Dmytruk.

Hello Christian Walter, Felix Held, Jonathan Zhang, Krystian Hebel, Martin L Roth, Martin Roth, Michał Żygowski, build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/67057?usp=email

to look at the new patch set (#34).

The following approvals got outdated and were removed:
Verified+1 by build bot (Jenkins)

Change subject: drivers/ipmi: add Block Transfer (BT) interface
......................................................................

drivers/ipmi: add Block Transfer (BT) interface

Unlike already implemented Keyboard Controller Style (KCS) interface
Block Transfer interface is not byte-oriented and implies that device is
capable of buffering a command before processing it.  Another difference
is that polling can be replaced with interrupts, though this isn't used
by this implementation.

More details can be found in "Intelligent Platform Management Interface
Specification", v2.0, Rev. 1.1

This was tested on Talos II (OpenPower platform) by Raptor Computing
Systems.

Change-Id: Idb67972d1c38bbae04c7b4de3405350c229a05b9
Signed-off-by: Sergii Dmytruk 
---
M Documentation/drivers/index.md
A Documentation/drivers/ipmi_bt.md
M src/drivers/ipmi/Kconfig
M src/drivers/ipmi/Makefile.mk
A src/drivers/ipmi/ipmi_bt.c
A src/drivers/ipmi/ipmi_bt.h
A src/drivers/ipmi/ipmi_bt_ops.c
M src/drivers/ipmi/ipmi_ops_premem.c
8 files changed, 409 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/57/67057/34