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authorSimon Glass <sjg@chromium.org>2011-12-19 15:47:12 -0800
committerGerrit <chrome-bot@google.com>2011-12-21 13:16:26 -0800
commit416b0a008f27eb6ff99fa6824532b131b783e32d (patch)
treebc284616d7f10312727df0caf1088a07b9344927 /README
parent5e601c69d07857ebfbd709acba7c448fd0189f5f (diff)
Add CONFIG_DELAY_CONSOLE to delay console init
This option delays console initialization until after relocation. This can save time if this init is relatively expensive, since after relocation the CPU is often running much faster. This option should be used in conjunction with CONFIG_PRE_CONSOLE_BUFFER to ensure that all console output is buffered until the console is ready for it. This saves about 30ms boot time. BUG=chromium-os:22938 TEST=build and boot on Kaen Change-Id: I3a774b418d45e7be9338f9942df445c2c2baa528 Reviewed-on: https://gerrit.chromium.org/gerrit/13207 Reviewed-by: Che-Liang Chiou <clchiou@chromium.org> Reviewed-by: Tom Wai-Hong Tam <waihong@chromium.org> Tested-by: Simon Glass <sjg@chromium.org> Commit-Ready: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'README')
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diff --git a/README b/README
index c419adf4c00..293f084ec38 100644
--- a/README
+++ b/README
@@ -556,6 +556,11 @@ The following options need to be configured:
the "silent" environment variable. See
doc/README.silent for more information.
+ When CONFIG_DELAY_CONSOLE is defined, the console init is
+ delayed until after relocation. To use this feature, the
+ board architecture code must call console_ready() after
+ relocation once everything is ready.
+
- Console Baudrate:
CONFIG_BAUDRATE - in bps
Select one of the baudrates listed in