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authorSimon Glass <sjg@chromium.org>2012-09-28 08:56:37 +0000
committerAnatolij Gustschin <agust@denx.de>2012-10-02 22:39:33 +0200
commit94fd1316b75896b668d22ce846785d92c0340100 (patch)
tree39d8044fa76e189b0247efc2949895689c92542b /README
parent0e9967735869a4e2bbc92d5d0eea0e2136180d49 (diff)
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bootstage: Store boot timings in device tree
Add an option, CONFIG_BOOTSTAGE_FDT to pass boot timings to the kernel in the device tree, if available. To use this, you must have CONFIG_OF_LIBFDT defined. Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'README')
-rw-r--r--README21
1 files changed, 21 insertions, 0 deletions
diff --git a/README b/README
index af76b0c..5e00fcc 100644
--- a/README
+++ b/README
@@ -2384,6 +2384,27 @@ The following options need to be configured:
29,916,167 26,005,792 bootm_start
30,361,327 445,160 start_kernel
+ CONFIG_BOOTSTAGE_FDT
+ Stash the bootstage information in the FDT. A root 'bootstage'
+ node is created with each bootstage id as a child. Each child
+ has a 'name' property and either 'mark' containing the
+ mark time in microsecond, or 'accum' containing the
+ accumulated time for that bootstage id in microseconds.
+ For example:
+
+ bootstage {
+ 154 {
+ name = "board_init_f";
+ mark = <3575678>;
+ };
+ 170 {
+ name = "lcd";
+ accum = <33482>;
+ };
+ };
+
+ Code in the Linux kernel can find this in /proc/devicetree.
+
Legacy uImage format:
Arg Where When