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authorJeremy Kerr <jk@ozlabs.org>2014-01-15 15:59:27 +0800
committerJeremy Kerr <jk@ozlabs.org>2014-01-15 15:59:27 +0800
commitaf805399e80ae70a9fc7af9b47d76577be44a683 (patch)
treebdf4b70c6c4b0da19440162c1b1cb384ef2c0383
parent49f515d354d8d40e2053fe5806fea12b06bcb115 (diff)
downloadtalos-petitboot-af805399e80ae70a9fc7af9b47d76577be44a683.tar.gz
talos-petitboot-af805399e80ae70a9fc7af9b47d76577be44a683.zip
utils: Add boot hook to set stdout property on DT machines
On machines that use device-tree boot, they'll often set an early console, defined by the linux,stdout property in the /chosen/ device tree node. This hook adds a facility for petitboot to set this, based on an NVRAM setting.
-rwxr-xr-xutils/hooks/20-set-stdout23
1 files changed, 23 insertions, 0 deletions
diff --git a/utils/hooks/20-set-stdout b/utils/hooks/20-set-stdout
new file mode 100755
index 0000000..92ff030
--- /dev/null
+++ b/utils/hooks/20-set-stdout
@@ -0,0 +1,23 @@
+#!/bin/sh
+
+# Hook to set the linux,stdout-path property from an nvram property
+# (named $nvram_prop).
+
+nvram_prop=petitboot,console
+
+# we need to be using a dtb
+[ -n "$boot_dtb" ] || exit
+
+console=$(nvram --print-config="$nvram_prop")
+
+[ $? = 0 -a -n "$console" ] || exit
+
+dtb_in=$boot_dtb
+dtb_out=$(mktemp)
+
+(
+ dtc -I dtb -O dts $dtb_in
+ echo '/ { chosen { linux,stdout-path = "'$console'"; }; }; '
+) | dtc -I dts -O dtb -o $dtb_out
+
+[ $? = 0 ] && mv $dtb_out $dtb_in
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