diff options
Diffstat (limited to 'src/device')
| -rw-r--r-- | src/device/Kconfig | 9 | ||||
| -rw-r--r-- | src/device/pci_device.c | 17 |
2 files changed, 25 insertions, 1 deletions
diff --git a/src/device/Kconfig b/src/device/Kconfig index 71292e8f15..9c9ecd1973 100644 --- a/src/device/Kconfig +++ b/src/device/Kconfig @@ -531,6 +531,15 @@ config PCI if PCI +config DOMAIN_RESOURCE_32BIT_LIMIT + hex + default 0xfe000000 + help + When the default pci_domain_read_resources() is used, + keep 32-bit memory resources below this limit. This is + used as a workaround for missing/wrong reservations of + chipset resources that usually reside above this limit. + config NO_ECAM_MMCONF_SUPPORT bool default n diff --git a/src/device/pci_device.c b/src/device/pci_device.c index e600f34fe6..5c5a5fb8dc 100644 --- a/src/device/pci_device.c +++ b/src/device/pci_device.c @@ -7,6 +7,7 @@ #include <acpi/acpi.h> #include <assert.h> +#include <cbmem.h> #include <device/pci_ops.h> #include <bootmode.h> #include <console/console.h> @@ -561,8 +562,22 @@ void pci_domain_read_resources(struct device *dev) res->flags = IORESOURCE_IO | IORESOURCE_SUBTRACTIVE | IORESOURCE_ASSIGNED; - /* Initialize the system-wide memory resources constraints. */ + /* + * Initialize 32-bit memory resource constraints. + * + * There are often undeclared chipset resources in lower memory + * and memory right below the 4G barrier. Hence, only allow + * one big range from cbmem_top to the configured limit. + */ res = new_resource(dev, IOINDEX_SUBTRACTIVE(1, 0)); + res->base = (uintptr_t)cbmem_top(); + res->limit = CONFIG_DOMAIN_RESOURCE_32BIT_LIMIT - 1; + res->flags = IORESOURCE_MEM | IORESOURCE_SUBTRACTIVE | + IORESOURCE_ASSIGNED; + + /* Initialize 64-bit memory resource constraints above 4G. */ + res = new_resource(dev, IOINDEX_SUBTRACTIVE(2, 0)); + res->base = 4ULL * GiB; res->limit = (1ULL << cpu_phys_address_size()) - 1; res->flags = IORESOURCE_MEM | IORESOURCE_SUBTRACTIVE | IORESOURCE_ASSIGNED; |