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build_kernel_image: modify console, loglevel and quiet kernel options

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Three related changes to kernel command line:

1. quiet kernel command line option is redundant with loglevel option
since quiet sets the loglevel to 4 but it is immediately overriden by
the loglevel option. Remove quiet option.

2. with loglevel set to 0 in the kernel command line, pstore console
doesn't work most of the time. This is because all printk's with level
lower than that don't make it to the console drivers. Set loglevel
to 7.

3. console=tty2 doesn't do what we want since the early boot and
shutdown messages with appropriate message log level are still visible
on screen. Set console to empty.

BUG=chrome-os-partner:12780
TEST=1. boot system and ensure that no kernel log messages appear on
screen. Then do a warm reboot and check that /dev/pstore/console-ramoops
file contains kernel log messages from the previous boot.
2. run bootperf test and ensure there are no boot time regressions.

Change-Id: Id1348c30d6aa3d818bae3259e748bf7100bf9c51
Reviewed-on: https://gerrit.chromium.org/gerrit/31180
Reviewed-by: Mandeep Singh Baines <msb@chromium.org>
Reviewed-by: Olof Johansson <olofj@chromium.org>
Commit-Ready: Sameer Nanda <snanda@chromium.org>
Tested-by: Sameer Nanda <snanda@chromium.org>
This commit is contained in:
Sameer Nanda 2012-08-22 16:11:12 -07:00 committed by Gerrit
parent ac6712fed3
commit 542cb53e9d
1 changed files with 2 additions and 3 deletions
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5
build_kernel_image.sh
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@ -133,9 +133,8 @@ info "Emitted cross-platform boot params to ${FLAGS_working_dir}/boot.config"
# Add common boot options first. # Add common boot options first.
cat <<EOF | cat - "${FLAGS_working_dir}/boot.config" \ cat <<EOF | cat - "${FLAGS_working_dir}/boot.config" \
> "${FLAGS_working_dir}/config.txt" > "${FLAGS_working_dir}/config.txt"
quiet loglevel=7
loglevel=0 console=
console=tty2
init=/sbin/init init=/sbin/init
cros_secure cros_secure
EOF EOF