| Huang, Ying | 164e217 | 2007-11-28 16:21:56 -0800 | [diff] [blame] | 1 | General note on [U]EFI x86_64 support |
| 2 | ------------------------------------- |
| 3 | |
| 4 | The nomenclature EFI and UEFI are used interchangeably in this document. |
| 5 | |
| 6 | Although the tools below are _not_ needed for building the kernel, |
| 7 | the needed bootloader support and associated tools for x86_64 platforms |
| 8 | with EFI firmware and specifications are listed below. |
| 9 | |
| 10 | 1. UEFI specification: http://www.uefi.org |
| 11 | |
| 12 | 2. Booting Linux kernel on UEFI x86_64 platform requires bootloader |
| 13 | support. Elilo with x86_64 support can be used. |
| 14 | |
| 15 | 3. x86_64 platform with EFI/UEFI firmware. |
| 16 | |
| 17 | Mechanics: |
| 18 | --------- |
| 19 | - Build the kernel with the following configuration. |
| 20 | CONFIG_FB_EFI=y |
| 21 | CONFIG_FRAMEBUFFER_CONSOLE=y |
| Huang, Ying | 9ad65e4 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 22 | If EFI runtime services are expected, the following configuration should |
| 23 | be selected. |
| 24 | CONFIG_EFI=y |
| 25 | CONFIG_EFI_VARS=y or m # optional |
| Huang, Ying | 164e217 | 2007-11-28 16:21:56 -0800 | [diff] [blame] | 26 | - Create a VFAT partition on the disk |
| 27 | - Copy the following to the VFAT partition: |
| 28 | elilo bootloader with x86_64 support, elilo configuration file, |
| 29 | kernel image built in first step and corresponding |
| 30 | initrd. Instructions on building elilo and its dependencies |
| 31 | can be found in the elilo sourceforge project. |
| 32 | - Boot to EFI shell and invoke elilo choosing the kernel image built |
| 33 | in first step. |
| Huang, Ying | 9ad65e4 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 34 | - If some or all EFI runtime services don't work, you can try following |
| 35 | kernel command line parameters to turn off some or all EFI runtime |
| 36 | services. |
| 37 | noefi turn off all EFI runtime services |
| 38 | reboot_type=k turn off EFI reboot runtime service |
| Paul Jackson | 200001e | 2008-06-25 05:44:46 -0700 | [diff] [blame] | 39 | - If the EFI memory map has additional entries not in the E820 map, |
| 40 | you can include those entries in the kernels memory map of available |
| 41 | physical RAM by using the following kernel command line parameter. |
| 42 | add_efi_memmap include EFI memory map of available physical RAM |