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device/Kconfig: Adapt PCIEXP_HOTPLUG_BUSES 

The default of 32 buses per hotplug bridge is rather high. Especially
for platforms that limit MMConf space to 64 buses: they run out of
numbers if there is more than a single hotplug bridge.

Lower the default to

*  8 if MMConf is limited to  64 or less buses,
* 16 if MMConf is limited to 128 or less buses.

Change-Id: I06d522dd92ceea9f4798273b26f947a5333800c3
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52069
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Nico Huber 2021-04-02 22:02:18 +02:00 committed by Patrick Georgi
parent 2d82195f97
commit 2a1ad76f78
1 changed files with 2 additions and 0 deletions
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src/device/Kconfig
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@ -626,6 +626,8 @@ if PCIEXP_HOTPLUG
config PCIEXP_HOTPLUG_BUSES config PCIEXP_HOTPLUG_BUSES
int "PCI Express Hotplug Buses" int "PCI Express Hotplug Buses"
default 8 if MMCONF_SUPPORT && MMCONF_BUS_NUMBER <= 64
default 16 if MMCONF_SUPPORT && MMCONF_BUS_NUMBER <= 128
default 32 default 32
help help
This is the number of buses allocated for hotplug PCI express This is the number of buses allocated for hotplug PCI express