code-update.md: Call fw_setenv twice for PrepareForUpdate
Support for u-boot redundant environment variables was
added where u-boot alternates writing to each environment
every time a variable is written. But initramfs doesn't
know which environment is active so it always reads from
the same one. Therefore need to twice set the
variables that initramfs reads so that they're written
to both environments and initramfs can read them.
Change-Id: I203386fc4be6a0deb7fa8b13757c83c8b0d4b4c4
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
diff --git a/code-update.md b/code-update.md
index ceb1578..30c1646 100644
--- a/code-update.md
+++ b/code-update.md
@@ -68,9 +68,12 @@
To update from the OpenBMC shell, follow the steps in this section.
-It is recommended that the BMC be prepared for update:
+It is recommended that the BMC be prepared for update (note that the
+environment variable needs to be set twice for initramfs be able to
+read it due to the U-Boot redundant environments):
fw_setenv openbmconce copy-files-to-ram copy-base-filesystem-to-ram
+ fw_setenv openbmconce copy-files-to-ram copy-base-filesystem-to-ram
reboot
Copy one or more of these `image-*` files to the directory: