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