xref: /openbmc/u-boot/lib/efi/Kconfig (revision 66dae3bb)
1config EFI
2	bool "Support running U-Boot from EFI"
3	depends on X86
4	help
5	  U-Boot can be started from EFI on certain platforms. This allows
6	  EFI to perform most of the system init and then jump to U-Boot for
7	  final system boot. Another option is to run U-Boot as an EFI
8	  application, with U-Boot using EFI's drivers instead of its own.
9
10choice
11	prompt "Select EFI mode to use"
12	depends on X86 && EFI
13
14config EFI_APP
15	bool "Support running as an EFI application"
16	help
17	  Build U-Boot as an application which can be started from EFI. This
18	  is useful for examining a platform in the early stages of porting
19	  U-Boot to it. It allows only very basic functionality, such as a
20	  command prompt and memory and I/O functions. Use 'reset' to return
21	  to EFI.
22
23config EFI_STUB
24	bool "Support running as an EFI payload"
25
26endchoice
27
28config EFI_RAM_SIZE
29	hex "Amount of EFI RAM for U-Boot"
30	depends on EFI_APP
31	default 0x2000000
32	help
33	  Set the amount of EFI RAM which is claimed by U-Boot for its own
34	  use. U-Boot allocates this from EFI on start-up (along with a few
35	  other smaller amounts) and it can never be increased after that.
36	  It is used as the RAM size in with U-Boot.
37
38choice
39	prompt "EFI 32/64-bit selection"
40	depends on EFI_STUB
41	help
42	  EFI does not support mixing 32-bit and 64-bit modes. This is a
43	  significant problem because it means that you must build a stub with
44	  the correct type for EFI to load it correctly. If you are using
45	  32-bit EFI, select 32-bit here, else select 64-bit. Failure to do
46	  this may produce no error message - it just won't start!
47
48config EFI_STUB_32BIT
49	bool "Produce a stub for running with 32-bit EFI"
50
51config EFI_STUB_64BIT
52	bool "Produce a stub for running with 64-bit EFI"
53
54endchoice
55