[coreboot-gerrit] Patch merged into coreboot/master: f0e23d4 uart8250: Fix and unify baudrate divisor calculation
gerrit at coreboot.org
gerrit at coreboot.org
Tue Mar 4 15:22:14 CET 2014
the following patch was just integrated into master:
commit f0e23d43d1a0d4c9e80f58b2efbfe84a32228e3f
Author: Kyösti Mälkki <kyosti.malkki at gmail.com>
Date: Mon Feb 17 19:37:52 2014 +0200
uart8250: Fix and unify baudrate divisor calculation
Divisor is a function of requested baudrate, platform-specific
reference clock and amount of oversampling done on the UART reference.
Calculate this parameter with divisor rounded to nearest integer.
When building without option_table or when there is no entry for
baud_rate, CONFIG_TTYS0_BAUD is used for default baudrate.
For OxPCIe use of 4 MHz for reference was arbitrary giving correct
divisor for 115200 but somewhat inaccurate for lower baudrates.
Actual hardware is 62500000 with 16 times oversampling.
FIXME: Field for baudrate in lb_tables is still incorrect.
Change-Id: I68539738469af780fadd3392263dd9b3d5964d2d
Signed-off-by: Kyösti Mälkki <kyosti.malkki at gmail.com>
See http://review.coreboot.org/5229 for details.
-gerrit
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