u-boot/doc/README.efi

32 as an application or just as a means of getting U-Boot onto a new platform.
59 U-Boot supports running as an EFI application for 32-bit EFI only. This is
75 To build U-Boot as an EFI application (32-bit EFI required), enable CONFIG_EFI
92    u-boot-app.efi      - U-Boot EFI application
93    u-boot-payload.efi  - U-Boot EFI payload application
108 run the application. 'bios.bin' is the EFI 'BIOS'. Check [2] to obtain a
116 (or fs0:u-boot-app.efi for the application)
119 that EFI does not support booting a 64-bit application from a 32-bit
129 The application and payload approaches sound similar but are in fact
134 For the application the whole of U-Boot is built as a shared library. The
154 Very little code is involved in implementing the EFI application feature.
167 image (including device tree) into a small EFI stub application responsible
168 for booting it. The stub application is built as a normal EFI application
171 The stub application is implemented in lib/efi/efi_stub.c. The efi_main()
176 The stub application is architecture-dependent. At present it has some
179 While the stub application does allocate some memory from EFI this is not
209 While the EFI application can in principle be built as either 32- or 64-bit,
210 only 32-bit is currently supported. This means that the application can only
229 - Add 64-bit application support
233 - Add more drivers to the application side (e.g. video, block devices, USB,
244 	payload stub, application, support code. Mostly arch-neutral
251 	x86 support code for running as an EFI application
254 	x86 board code for running as an EFI application
272 In addition to support for running U-Boot as a UEFI application, U-Boot itself
294 an efi application as well as snippet in the default distro boot script that