Evgeny Zinoviev has uploaded this change for review.

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Doc/mb/lenovo/montevina_series: Describe GbE generating

Instead of using the gbe region extracted from stock dump, one may want
to generate the new one. util/bincfg can do that, but it's not
documented anywhere yet.

This patch describes how to do that along with changing the MAC
address.

Change-Id: I9318514b125b53f8ad76ad99755690ec6f681441
Signed-off-by: Evgeny Zinoviev <me@ch1p.io>
---
M Documentation/mainboard/lenovo/montevina_series.md
1 file changed, 30 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/61/39761/1

diff --git a/Documentation/mainboard/lenovo/montevina_series.md b/Documentation/mainboard/lenovo/montevina_series.md
index 62e8796..39dee2f 100644
--- a/Documentation/mainboard/lenovo/montevina_series.md
+++ b/Documentation/mainboard/lenovo/montevina_series.md
@@ -33,6 +33,9 @@
 $ ifdtool -x backup.rom
 ```
 
+Note that you can also [generate new GbE region](#generating-gbe-region) and use
+it instead.
+
 Now you need to patch the flash descriptor. You can either [modify the one from
 your backup with **ifdtool**](#modifying-flash-descriptor-using-ifdtool), or
 [generate a completely new one with **bincfg**](#creating-a-new-flash-descriptor-using-bincfg).
@@ -122,6 +125,7 @@
     (/path/to/flashregion_0_flashdescriptor.bin) Path and filename of the descriptor.bin file
 
     [*] Add gigabit ethernet configuration
+    # Note: if you used bincfg, specify path to generated util/bincfg/flashregion_3_gbe.bin
     (/path/to/flashregion_3_gbe.bin) Path to gigabit ethernet configuration
 ```
 
@@ -136,6 +140,32 @@
 # flashrom -p YOUR_PROGRAMMER -w coreboot.rom --ifd -i bios
 ```
 
+## Generating GbE region
+
+GbE region contains configuration data for Intel integrated Gigabit Ethernet.
+You can generate new GbE Region by using **bincfg**. To do that, go to
+`util/bincfg`.
+
+It's good idea to set MAC address first, so open then `gbe-ich9m.set` file and
+change values of `macaddress0` .. `macaddress5` fields. For example, if you want
+to set MAC address to `00:01:02:03:04:05`:
+
+```
+    "macaddress0" = 0x0,
+    "macaddress1" = 0x1,
+    "macaddress2" = 0x2,
+    "macaddress3" = 0x3,
+    "macaddress4" = 0x4,
+    "macaddress5" = 0x5
+```
+
+Then run:
+```console
+$ make gen-gbe-ich9m
+```
+
+The new GbE region will be saved to `flashregion_3_gbe.bin`.
+
 ## Flash layout
 
 The flash layouts of the OEM firmware are as follows:

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