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superio/aspeed/common: add workaround for serial routing delay quirk 

Some mainboards with an ASPEED BMC do the serial routing setup in the
BMC boot phase on cold boot. This results in scrambled console output
when this is not finished fast enough.

This adds a delay of 500ms as workaround in the BMCs uart setup that
can be selected at mainboard level.

A user may disable the workaround when using another BMC firmware like
OpenBMC, u-bmc or some custom BMC bootloader with fast serial setup.

Change-Id: I7d6599b76384fc94a00a9cfc1794ebfe34863ff9
Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36591
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Michael Niewöhner 2019-11-03 00:51:27 +01:00 committed by Patrick Georgi
parent a1b700ff74
commit 4d877c8c7f
2 changed files with 21 additions and 0 deletions
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17
src/superio/aspeed/common/Kconfig
View File

@ -20,3 +20,20 @@
config SUPERIO_ASPEED_COMMON_PRE_RAM
bool
default n
config SUPERIO_ASPEED_HAS_UART_DELAY_WORKAROUND
bool
default n
config SUPERIO_ASPEED_USE_UART_DELAY_WORKAROUND
bool "Workaround for BMC serial console setup bug"
depends on CONSOLE_SERIAL && SUPERIO_ASPEED_HAS_UART_DELAY_WORKAROUND
default y
help
Some mainboards with an ASPEED BMC have scrambled console output in early boot phases
because the serial output routing is not set up fast enough by the BMC. By enabling
this a delay of 500ms gets added before setting up the console and before any console
output gets printed.
Note: this problem may disappear with future BMC firmware versions. Another approach
is using a different BMC firmware like OpenBMC, u-bmc, ...

4
src/superio/aspeed/common/early_serial.c
View File

@ -35,6 +35,7 @@
*/
#include <arch/io.h>
#include <delay.h>
#include <device/pnp_def.h>
#include <device/pnp_ops.h>
#include <stdint.h>
@ -67,4 +68,7 @@ void aspeed_enable_serial(pnp_devfn_t dev, u16 iobase)
pnp_set_iobase(dev, PNP_IDX_IO0, iobase);
pnp_set_enable(dev, 1);
pnp_exit_conf_state(dev);
if (CONFIG(SUPERIO_ASPEED_USE_UART_DELAY_WORKAROUND))
mdelay(500);
}