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authorKevin O'Connor <kevin@koconnor.net>2011-07-09 20:22:21 -0400
committerPatrick Georgi <patrick@georgi-clan.de>2011-07-12 11:36:20 +0200
commita68555f48d06b4c8d55f7e4ca208805bec3d5512 (patch)
tree132a21ab3f20d2ca5ce967705d4d92c3c0dbe476 /src/cpu
parent537cacfa04c9dc56cd608012a73d95ab342d2f81 (diff)
Do full flush on uart8250 only at end of printk.
The previous code does a full flush of the uart after every character. Unfortunately, this can cause transmission delays on some serial ports. This patch changes the code so that it does a flush at the end of every printk instead of at the end of every character. This reduces the time it takes to transmit serial messages (up to 9% on my Asrock e350m1 board). It also makes the transmission time more consistent which is important when performing timing tests via serial transmissions. Change-Id: I6b28488b905da68c6d68d7c517cc743cde567d70 Signed-off-by: Kevin O'Connor <kevin@koconnor.net> Reviewed-on: http://review.coreboot.org/90 Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org> Tested-by: build bot (Jenkins) Reviewed-by: Rudolf Marek <r.marek@assembler.cz> Reviewed-by: Sven Schnelle <svens@stackframe.org>
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