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2 IMPORTANT Information related to the gnu-efi package
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3 and x86_64 efi support
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4 ----------------------------------------------------
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5 August 2003
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6
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7 As of version elilo-3.0, the gnu-efi package is now split in two different packages:
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8
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9 -> gnu-efi-X.y: contains the EFI library, header, files, and crt0.
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10
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11 -> elilo-X.y : contains the ELILO bootloader.
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12
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13 Note that X.y don't need to match for both packages. However elilo-3.x requires at
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14 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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15
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16 Note that EFI support for x86_64 has been added as a patch to gnu-efi-3.0c.
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17
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18 For x86_64, see the important notes under x86_64.
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19
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20 IMPORTANT NOTE FOR IA-32:
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21 -------------------------
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22 For IA-32, the Redhat 8.0 toolchain is known to produce
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23 working binaries when used with gnu-efi-3.0a + loader
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24 script patch which is included in the gnu-efi-3.0a-ia32.patch
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25 in this package. The toolchain includes:
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26
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27 gcc: gcc version 3.2 20020903 (Red Hat Linux 8.0 3.2-7)
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28 as: GNU assembler version 2.13.90.0.2 (i386-redhat-linux) using BFD version
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29 2.13.90.0.2 20020802
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30 ld: GNU ld version 2.13.90.0.2 20020802
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31
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32 The Redhat 9.0 toolchain does not work at the moment.
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33
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34 The gnu-efi package can be downloaded from:
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35
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36 ftp://ftp.hpl.hp.com/pub/linux-ia64/gnu-efi-X.y.tar.gz
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37
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38 IMPORTANT NOTE FOR x86_64:
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39 -------------------------
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40
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41 EFI x86_64 elilo support requires the following libraries:
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42
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43 1. gnu-efi-3.0c library with x86_64 support.
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44
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45 2. The toolchain known to produce working x86_64 efi binary are:
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46
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47 gcc-4.1.1 or above
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48 binutils-2.17.50.0.14 with Intel64 EFI support
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49
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50 Implementation:
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51 --------------
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52 Calls to EFI services in x86_64 require a wrapper to pass the arguments
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53 in the appropriate manner. This is implemented with efi wrapper.
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54 For IA32 and IA64, the wrapper is a macro that merely calls the
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55 EFI services directly. The elilo source has been modified to use the
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56 efi wrapper implemented in gnu-efi-3.0c library.
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57 elilo for x86_64 and its dependent libraries are built and the final
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58 ELF image is converted into PE-COFF image using the objcopy supported
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59 by binutils-2.17.50.0.14 or above with Intel64 EFI support.
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60
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61 On UEFI 2.0 firmware, only Graphics Output Protocol (GOP) is supported.
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62 The x86_64 elilo first queries video information from GOP failing which
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63 it queries for text mode support. The video information is passed to
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64 Linux kernel via boot parameter. The GOP support requires
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65 Linux kernel EFI framebuffer driver (kernel configuration option).
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