README: Fix evb-ast2500 config
The evb-ast2500 config by `. setup` command was broken due to duplicated
machine config. Add a special note about how to manually specify the
machine config to setup the build.
Signed-off-by: Lei YU <yulei.sh@bytedance.com>
Change-Id: Ifad02bef1c8c5246494adcc3a8a4b6aaa974633b
diff --git a/README.md b/README.md
index cbbfb5a..931dc6b 100644
--- a/README.md
+++ b/README.md
@@ -66,6 +66,14 @@
. setup romulus
```
+For evb-ast2500, please use the below command to specify the machine config,
+because the machine in `meta-aspeed` layer is in a BSP layer and does not
+build the openbmc image.
+
+```
+TEMPLATECONF=meta-evb/meta-evb-aspeed/meta-evb-ast2500/conf . openbmc-env
+```
+
### 4) Build
```