Bootloader may need to fixup the device tree before OS can use it.
e.g. a UEFI/DXE driver that has initialized a controller can add
controller's clock frequency in controller node. This way OS need not to
call get/set clock for that controller.
Therefore, install fdt used by OS in configuration tables and associate it
with device tree guid.
UEFI/DXE drivers can fixup this device tree in their respective
ExitBootServices events.
Cc: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Cc: linux-efi@xxxxxxxxxxxxxxx
Signed-off-by: Pankaj Bansal <pankaj.bansal@xxxxxxx>
---
drivers/firmware/efi/libstub/fdt.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/firmware/efi/libstub/fdt.c b/drivers/firmware/efi/libstub/fdt.c
index 177654e..df862e6 100644
--- a/drivers/firmware/efi/libstub/fdt.c
+++ b/drivers/firmware/efi/libstub/fdt.c
@@ -265,6 +265,7 @@ efi_status_t allocate_new_fdt_and_exit_boot(efi_system_table_t *sys_table_arg,
int runtime_entry_count = 0;
struct efi_boot_memmap map;
struct exit_boot_struct priv;
+ efi_guid_t fdt_guid = DEVICE_TREE_GUID;
map.map = &runtime_map;
map.map_size = &map_size;
@@ -314,6 +315,13 @@ efi_status_t allocate_new_fdt_and_exit_boot(efi_system_table_t *sys_table_arg,
goto fail_free_new_fdt;
}
+ status = efi_call_early(install_configuration_table, &fdt_guid,
+ (void *)*new_fdt_addr);
+ if (status != EFI_SUCCESS) {
+ pr_efi_err(sys_table_arg, "Unable to install new device tree.\n");
+ goto fail_free_new_fdt;
+ }
+
priv.runtime_map = runtime_map;
priv.runtime_entry_count = &runtime_entry_count;
priv.new_fdt_addr = (void *)*new_fdt_addr;
--
2.7.4
--
To unsubscribe from this list: send the line "unsubscribe linux-efi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
