update_kernel: Save .5 seconds by avoiding tmp copy for kernel image
There's no need to store to a temporary file when updating the kernel
partition. Just stream straight to the right partition. This appears
to save about .5 seconds.
BUG=None
TEST=Time update_kernel and see savings; verify that kernel still gets
updated.
Change-Id: I5afead3e70720ee6dc9e6a822ef1a98032d93b79
Reviewed-on: https://gerrit.chromium.org/gerrit/39783
Commit-Ready: Doug Anderson <dianders@chromium.org>
Reviewed-by: Doug Anderson <dianders@chromium.org>
Tested-by: Doug Anderson <dianders@chromium.org>
diff --git a/update_kernel.sh b/update_kernel.sh
index ebfcfba..395a2c2 100755
--- a/update_kernel.sh
+++ b/update_kernel.sh
@@ -90,8 +90,7 @@
}
copy_kernelimage() {
- remote_cp_to $TMP/new_kern.bin /tmp
- remote_sh dd if=/tmp/new_kern.bin of="${FLAGS_partition}"
+ remote_sh dd of="${FLAGS_partition}" bs=4K < "${TMP}/new_kern.bin"
}
check_kernelbuildtime() {
