upstream u-boot with additional patches for our devices/boards: https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ; Gbit ethernet patch for some LIME2 revisions ; with SPI flash support
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u-boot/lib/efi/Kconfig

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config EFI
bool "Support running U-Boot from EFI"
depends on X86
help
U-Boot can be started from EFI on certain platforms. This allows
EFI to perform most of the system init and then jump to U-Boot for
final system boot. Another option is to run U-Boot as an EFI
application, with U-Boot using EFI's drivers instead of its own.
choice
prompt "Select EFI mode to use"
depends on X86 && EFI
config EFI_APP
bool "Support running as an EFI application"
help
Build U-Boot as an application which can be started from EFI. This
is useful for examining a platform in the early stages of porting
U-Boot to it. It allows only very basic functionality, such as a
command prompt and memory and I/O functions. Use 'reset' to return
to EFI.
config EFI_STUB
bool "Support running as an EFI payload"
endchoice
config EFI_RAM_SIZE
hex "Amount of EFI RAM for U-Boot"
depends on EFI_APP
default 0x2000000
help
Set the amount of EFI RAM which is claimed by U-Boot for its own
use. U-Boot allocates this from EFI on start-up (along with a few
other smaller amounts) and it can never be increased after that.
It is used as the RAM size in with U-Boot.
choice
prompt "EFI 32/64-bit selection"
depends on EFI_STUB
help
EFI does not support mixing 32-bit and 64-bit modes. This is a
significant problem because it means that you must build a stub with
the correct type for EFI to load it correctly. If you are using
32-bit EFI, select 32-bit here, else select 64-bit. Failure to do
this may produce no error message - it just won't start!
config EFI_STUB_32BIT
bool "Produce a stub for running with 32-bit EFI"
config EFI_STUB_64BIT
bool "Produce a stub for running with 64-bit EFI"
endchoice