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2.3 KiB
2.3 KiB
Compile and run GNU-EFI applications under linux
Requirements :
Download gnu-efi from here : https://sourceforge.net/projects/gnu-efi/
- gcc-3.0 or newer
gcc --version
- A version of objcopy that supports EFI applications :
objcopy --help
Check if supported target contains elf64-x86-64 elf32-i386 elf32-x86-64
- mtools : Utilities to access MS-DOS disks from Linux
Compile and install GNU-EFI Library:
Go to gnu-efi source folder
make
make install
Compile GNU-EFI application :
Use this makefile to easily compile and run gnu-efi application. It will recursively compile all c files in the sub-directories. Change the following macros to locate the libraries and headers installed on the previous step.
IMAGE = uefi_app
TARGET = main.efi
INCDIR = /usr/local/include
LIBDIR = /usr/local/lib
EFILIB = /usr/local/lib
Run on qemu :
Locate OVMF in Makefile:
To run the compiled application in qemu we need OVMF for UEFI emulation. OVMF is a port of Intel's tianocore firmware to the qemu virtual machine. Download it from here.
OVMF_DIR = ../OVMF
Change the OVMF directory in the makefile.
Create Image :
make img
It will do the following tasks :
# Create a new image file that will contain the GNU-EFI application.
dd if=/dev/zero of=$(IMAGE).img bs=512 count=93750
# mformat to format it with FAT16.
mformat -i $(IMAGE).img -h 32 -t 32 -n 64 -c 1 ::
# Create directory
mmd -i $(IMAGE).img ::/EFI
mmd -i $(IMAGE).img ::/EFI/BOOT
# Copy image
mcopy -i $(IMAGE).img $(TARGET) ::/EFI/BOOT
# Copy the nsh script to load efi application automatically from fs0
mcopy -i $(IMAGE).img startup.nsh ::
Run :
make run
Running on real hardware :
- Format a pendrive with FAT32 file system.
- Create /efi/boot/ folders in the pendrive
- Rename main.efi to bootx64.efi for 64 bit and bootia32.efi for 32 bit application.
- For 64 bit application the pendrive should look like this : /efi/boot/bootx64.efi
- For 32 bit application the pendrive should look like this : /efi/boot/bootia32.efi