1config EFI 2 bool "Support running U-Boot from EFI" 3 depends on X86 4 imply X86_TSC_READ_BASE 5 help 6 U-Boot can be started from EFI on certain platforms. This allows 7 EFI to perform most of the system init and then jump to U-Boot for 8 final system boot. Another option is to run U-Boot as an EFI 9 application, with U-Boot using EFI's drivers instead of its own. 10 11choice 12 prompt "Select EFI mode to use" 13 depends on X86 && EFI 14 15config EFI_APP 16 bool "Support running as an EFI application" 17 select CHARSET 18 help 19 Build U-Boot as an application which can be started from EFI. This 20 is useful for examining a platform in the early stages of porting 21 U-Boot to it. It allows only very basic functionality, such as a 22 command prompt and memory and I/O functions. Use 'reset' to return 23 to EFI. 24 25config EFI_STUB 26 bool "Support running as an EFI payload" 27 28endchoice 29 30choice 31 prompt "EFI app 32/64-bit selection" 32 depends on EFI_APP 33 help 34 EFI does not support mixing 32-bit and 64-bit modes. This is a 35 significant problem because it means that you must build a stub with 36 the correct type for EFI to load it correctly. If you are using 37 32-bit EFI, select 32-bit here, else select 64-bit. Failure to do 38 this may produce no error message - it just won't start! 39 40config EFI_APP_32BIT 41 bool "Produce an app for running with 32-bit EFI" 42 43config EFI_APP_64BIT 44 bool "Produce an app for running with 64-bit EFI" 45 46endchoice 47 48choice 49 prompt "EFI stub 32/64-bit selection" 50 depends on EFI_STUB 51 help 52 EFI does not support mixing 32-bit and 64-bit modes. This is a 53 significant problem because it means that you must build a stub with 54 the correct type for EFI to load it correctly. If you are using 55 32-bit EFI, select 32-bit here, else select 64-bit. Failure to do 56 this may produce no error message - it just won't start! 57 58config EFI_STUB_32BIT 59 bool "Produce a stub for running with 32-bit EFI" 60 61config EFI_STUB_64BIT 62 bool "Produce a stub for running with 64-bit EFI" 63 64endchoice 65 66config EFI_RAM_SIZE 67 hex "Amount of EFI RAM for U-Boot" 68 depends on EFI_APP 69 default 0x10000000 70 help 71 Set the amount of EFI RAM which is claimed by U-Boot for its own 72 use. U-Boot allocates this from EFI on start-up (along with a few 73 other smaller amounts) and it can never be increased after that. 74 It is used as the RAM size in with U-Boot. 75