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authorSimon Glass <sjg@chromium.org>2014-07-23 06:55:03 -0600
committerSimon Glass <sjg@chromium.org>2014-07-23 14:07:24 +0100
commit00606d7e39da4a8ecfbbc19d5af252bdfdd1fcc9 (patch)
tree53f8d51b84e75120a3b673946e515ffcbe250ceb /test/dm/test.dts
parent6133683320ece056e49051e52a180adb21992b40 (diff)
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dm: Allow drivers to be marked 'before relocation'
Driver model currently only operates after relocation is complete. In this state U-Boot typically has a small amount of memory available. In adding support for driver model prior to relocation we must try to use as little memory as possible. In addition, on some machines the memory has not be inited and/or the CPU is not running at full speed or the data cache is off. These can reduce execution performance, so the less initialisation that is done before relocation the better. An immediately-obvious improvement is to only initialise drivers which are actually going to be used before relocation. On many boards the only such driver is a serial UART, so this provides a very large potential benefit. Allow drivers to mark themselves as 'pre-reloc' which means that they will be initialised prior to relocation. This can be done either with a driver flag or with a 'dm,pre-reloc' device tree property. To support this, the various dm scanning function now take a 'pre_reloc_only' parameter which indicates that only drivers marked pre-reloc should be bound. Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'test/dm/test.dts')
-rw-r--r--test/dm/test.dts10
1 files changed, 10 insertions, 0 deletions
diff --git a/test/dm/test.dts b/test/dm/test.dts
index 74d236b..cd18a31 100644
--- a/test/dm/test.dts
+++ b/test/dm/test.dts
@@ -6,11 +6,21 @@
#address-cells = <1>;
#size-cells = <0>;
+ aliases {
+ console = &uart0;
+ };
+
+ uart0: serial {
+ compatible = "sandbox,serial";
+ u-boot,dm-pre-reloc;
+ };
+
a-test {
reg = <0>;
compatible = "denx,u-boot-fdt-test";
ping-expect = <0>;
ping-add = <0>;
+ u-boot,dm-pre-reloc;
};
junk {