2004-02-23 13:11:30 +00:00
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IMPORTANT Information related to the gnu-efi package
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2007-07-20 13:30:47 +00:00
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and x86_64 efi support
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2004-02-23 13:11:30 +00:00
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----------------------------------------------------
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August 2003
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As of version elilo-3.0, the gnu-efi package is now split in two different packages:
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-> gnu-efi-X.y: contains the EFI library, header, files, and crt0.
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-> elilo-X.y : contains the ELILO bootloader.
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Note that X.y don't need to match for both packages. However elilo-3.x requires at
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least gnu-efi >= 3.0. When using a version of gcc >3.0 you MUST use at least gnu-efi-3.0a.
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2007-07-20 13:30:47 +00:00
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Note that EFI support for x86_64 has been added as a patch to gnu-efi-3.0c.
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For x86_64, see the important notes under x86_64.
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2004-02-23 13:11:30 +00:00
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IMPORTANT NOTE FOR IA-32:
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-------------------------
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For IA-32, the Redhat 8.0 toolchain is known to produce
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working binaries when used with gnu-efi-3.0a + loader
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script patch which is included in the gnu-efi-3.0a-ia32.patch
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in this package. The toolchain includes:
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gcc: gcc version 3.2 20020903 (Red Hat Linux 8.0 3.2-7)
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as: GNU assembler version 2.13.90.0.2 (i386-redhat-linux) using BFD version
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2.13.90.0.2 20020802
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ld: GNU ld version 2.13.90.0.2 20020802
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The Redhat 9.0 toolchain does not work at the moment.
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The gnu-efi package can be downloaded from:
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ftp://ftp.hpl.hp.com/pub/linux-ia64/gnu-efi-X.y.tar.gz
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2007-07-20 13:30:47 +00:00
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IMPORTANT NOTE FOR x86_64:
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-------------------------
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EFI x86_64 elilo support requires the following libraries:
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1. gnu-efi-3.0c library with x86_64 support.
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2. The toolchain known to produce working x86_64 efi binary are:
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gcc-4.1.1 or above
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binutils-2.17.50.0.14 with Intel64 EFI support
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Implementation:
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--------------
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Calls to EFI services in x86_64 require a wrapper to pass the arguments
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in the appropriate manner. This is implemented with efi wrapper.
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For IA32 and IA64, the wrapper is a macro that merely calls the
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EFI services directly. The elilo source has been modified to use the
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efi wrapper implemented in gnu-efi-3.0c library.
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elilo for x86_64 and its dependent libraries are built and the final
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ELF image is converted into PE-COFF image using the objcopy supported
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by binutils-2.17.50.0.14 or above with Intel64 EFI support.
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On UEFI 2.0 firmware, only Graphics Output Protocol (GOP) is supported.
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The x86_64 elilo first queries video information from GOP failing which
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it queries for text mode support. The video information is passed to
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Linux kernel via boot parameter. The GOP support requires
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Linux kernel EFI framebuffer driver (kernel configuration option).
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