x86: Reserve PCIe ECAM address range in the E820 table

[karo-tx-uboot.git] / arch / x86 / Kconfig

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index cbbaa4f2ce6db901a2ccf8941710332a0c696f4e..e8968a7182bbcbc0b64722b4667b97fcc7c00ac4 100644 (file)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -369,4 +369,14 @@ config PCIE_ECAM_BASE
          assigned to PCI devices - i.e. the memory and prefetch regions, as
          passed to pci_set_region().
 
+config PCIE_ECAM_SIZE
+       hex
+       default 0x10000000
+       help
+         This is the size of memory-mapped address of PCI configuration space,
+         which is only available through the Enhanced Configuration Access
+         Mechanism (ECAM) with PCI Express. Each bus consumes 1 MiB memory,
+         so a default 0x10000000 size covers all of the 256 buses which is the
+         maximum number of PCI buses as defined by the PCI specification.
+
 endmenu