@@ -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
@@ -77,5 +77,11 @@ unsigned install_e820_map(unsigned max_entries, struct e820entry *entries)
num_entries++;
}
+ /* Mark PCIe ECAM address range as reserved */
+ entries[num_entries].addr = CONFIG_PCIE_ECAM_BASE;
+ entries[num_entries].size = CONFIG_PCIE_ECAM_SIZE;
+ entries[num_entries].type = E820_RESERVED;
+ num_entries++;
+
return num_entries;
}
@@ -61,8 +61,11 @@ __weak unsigned install_e820_map(unsigned max_entries,
entries[2].addr = ISA_END_ADDRESS;
entries[2].size = gd->ram_size - ISA_END_ADDRESS;
entries[2].type = E820_RAM;
+ entries[3].addr = CONFIG_PCIE_ECAM_BASE;
+ entries[3].size = CONFIG_PCIE_ECAM_SIZE;
+ entries[3].type = E820_RESERVED;
- return 3;
+ return 4;
}
static void build_command_line(char *command_line, int auto_boot)
We should mark PCIe ECAM address range in the E820 table as reserved otherwise kernel will not attempt to use ECAM. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> --- Changes in v2: - New patch to reserve PCIe ECAM address range in the E820 table arch/x86/Kconfig | 10 ++++++++++ arch/x86/lib/fsp/fsp_dram.c | 6 ++++++ arch/x86/lib/zimage.c | 5 ++++- 3 files changed, 20 insertions(+), 1 deletion(-)