From 148762110c8a00c88b8e0326ec69dc7392bf3739 Mon Sep 17 00:00:00 2001 From: Lee Leahy Date: Wed, 4 May 2016 13:13:20 -0700 Subject: drivers/uart: Enable override for input clock divider Allow the platform to override the input clock divider by adding the uart_input_clock_divider routine. This routine combines the baud-rate oversample divider with any other input clock divider. The default routine returns 16 which is the standard baud-rate oversampling value. A platform may override this default "weak" routine by providing a new routine and selecting UART_OVERRIDE_INPUT_CLOCK_DIVIDER. This works around ROMCC not supporting weak routines. Testing on Galileo: * Edit the src/mainboard/intel/galileo/Makefile.inc file: * Add "select ADD_FSP_PDAT_FILE" * Add "select ADD_FSP_RAW_BIN" * Add "select ADD_RMU_FILE" * Place the FSP.bin file in the location specified by CONFIG_FSP_FILE * Place the pdat.bin files in the location specified by CONFIG_FSP_PDAT_FILE * Place the rmu.bin file in the location specified by CONFIG_RMU_FILE * Build EDK2 CorebootPayloadPkg/CorebootPayloadPkgIa32.dsc to generate UEFIPAYLOAD.fd * Testing is successful when CorebootPayloadPkg is able to properly initialize the serial port without using built-in values. Change-Id: Ieb6453b045d84702b8f730988d0fed9f253f63e2 Signed-off-by: Lee Leahy Reviewed-on: https://review.coreboot.org/14611 Tested-by: build bot (Jenkins) Reviewed-by: Martin Roth --- src/drivers/uart/Kconfig | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'src/drivers/uart/Kconfig') diff --git a/src/drivers/uart/Kconfig b/src/drivers/uart/Kconfig index ae3e81adb1..cb129b0643 100644 --- a/src/drivers/uart/Kconfig +++ b/src/drivers/uart/Kconfig @@ -13,6 +13,13 @@ config DRIVERS_UART_8250IO config NO_UART_ON_SUPERIO def_bool n +config UART_OVERRIDE_INPUT_CLOCK_DIVIDER + boolean + default n + help + Set to "y" when the platform overrides the uart_input_clock_divider + routine. + config DRIVERS_UART_8250MEM bool default n -- cgit v1.2.3