This change sets UART_FIFO_RXILVL to 3 for the AP and EC UART. With this
change RXINT will only be triggered when 4 characters are received
instead of for every character.
The change also flushes the RX FIFO whenever console input is received
through usb make sure to the user can see their input as they are typing.
BUG=none
BRANCH=none
TEST=run taskinfo after the system finishes booting.
Before Change the IRQ count for 181 should be around 20000.
After the change it should be around 5000.
Use the AP and EC console over USB and verify there is no
noticeable change in their usability.
Change-Id: I134ea0d2bc254038dad6c341b94f822adb90c000
Signed-off-by: Mary Ruthven <mruthven@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/387175
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
1ae3ffc608