The 64-bit app is supported now, so update the documentation.

Signed-off-by: Simon Glass sjg@chromium.org ---

doc/develop/uefi/u-boot_on_efi.rst | 26 +++++++++++--------------- 1 file changed, 11 insertions(+), 15 deletions(-)

diff --git a/doc/develop/uefi/u-boot_on_efi.rst b/doc/develop/uefi/u-boot_on_efi.rst index acad6397e81d..1746965e7eab 100644 --- a/doc/develop/uefi/u-boot_on_efi.rst +++ b/doc/develop/uefi/u-boot_on_efi.rst @@ -31,14 +31,12 @@ Only x86 is supported at present. If you are using EFI on another architecture you may want to reconsider. However, much of the code is generic so could be ported.

-U-Boot supports running as an EFI application for 32-bit EFI only. This is -not very useful since only a serial port is provided. You can look around at -memory and type 'help' but that is about it. +U-Boot supports running as an EFI application for both 32- and 64-bit EFI.

-More usefully, U-Boot supports building itself as a payload for either 32-bit -or 64-bit EFI. U-Boot is packaged up and loaded in its entirety by EFI. Once -started, U-Boot changes to 32-bit mode (currently) and takes over the -machine. You can use devices, boot a kernel, etc. +U-Boot supports building itself as a payload for either 32-bit or 64-bit EFI. +U-Boot is packaged up and loaded in its entirety by EFI. Once started, U-Boot +changes to 32-bit mode (currently) and takes over the machine. You can use +devices, boot a kernel, etc.

Build Instructions @@ -47,9 +45,9 @@ First choose a board that has EFI support and obtain an EFI implementation for that board. It will be either 32-bit or 64-bit. Alternatively, you can opt for using QEMU [1] and the OVMF [2], as detailed below.

-To build U-Boot as an EFI application (32-bit EFI required), enable CONFIG_EFI -and CONFIG_EFI_APP. The efi-x86_app config (efi-x86_app32_defconfig) is set up -for this. Just build U-Boot as normal, e.g.:: +To build U-Boot as an EFI application, enable CONFIG_EFI and CONFIG_EFI_APP. +The efi-x86_app32 and efi-x86_app64 configs are set up for this. Just build +U-Boot as normal, e.g.::

make efi-x86_app32_defconfig make @@ -189,9 +187,9 @@ interrupts disabled at present.

32/64-bit ~~~~~~~~~ -While the EFI application can in principle be built as either 32- or 64-bit, -only 32-bit is currently supported. This means that the application can only -be used with 32-bit EFI. +While the EFI application can be built as either 32- or 64-bit, you need to be +careful to build the correct one so that your UEFI firmware can start it. Most +UEFI images are 64-bit at present.

The payload stub can be build as either 32- or 64-bits. Only a small amount of code is built this way (see the extra- line in lib/efi/Makefile). @@ -261,8 +259,6 @@ This work could be extended in a number of ways:

- Add ARM support

-- Add 64-bit application support (in progress) - - Figure out how to solve the interrupt problem

- Add more drivers to the application side (e.g.USB, environment access).