EFI

["http://wiki.osx86project.org/wiki/index.php?title=EFI&action=edit&section=3">edit] 受支持的硬件

Based on preliminary analysis of apple_hardware_test from 10.4.4, only the following device classes are handled and/or accepted by included EFI modules:

[edit] 资源

On a new Intel iMac, here is the output of:

MacInTouch also has the output of System Profiler. :D

Intel provides a sample EFI implementation on their EFI website, complete with source code. OS X almost certainly requires more than what this implementation provides (the sample was created in 2003 and probably lacks key functionalities), but it should be a good starting point to get a feel for how an EFI system is partitioned (assuming 10.4.4 uses GPT partitoning) and how it boots.

Also included are IA-32 images that allow standard PC systems to boot to EFI for educational and testing purposes: http://developer.intel.com/technology/efi/main_sample.htm

[edit] Apple EFI 运行时

The AppleEFIRuntime.kext file from 10.4.4 does not currently load on a 10.4.3-based system because of missing symbols:

kextload: extension AppleEFIRuntime.kext appears to be valid
kld(): Undefined symbols:
_gPEEFISystemTable
kextload: kld_load_from_memory() failed for module
        /[...]/AppleEFIRuntime.kext/Contents/MacOS/AppleEFIRuntime
kextload: a link/load error occured for kernel extension AppleEFIRuntime.kext
load failed for extension AppleEFIRuntime.kext
 (run kextload with -t for diagnostic output)

According to an unofficial Apple/Intel FAQ, the graphics drivers seem to have a direct association with EFI modules. This can be seen in the System Profiler listing that they provide as "EFI Driver Version: 01.00.063". Some users have commented that an EFI module may be responsible for ROM BIOS initialization on ATI graphics cards.

[edit] 与 TPM 的关系

Additionally, the lack of presence of a TPM kernel extension in 10.4.4 means that the functionality probably now exists as an EFI module. There is also a possible association with Don't Steal Mac OS X.kext, which presumably acts to support memory page encryption and decryption.

We know that there must be some sort of TPM support provided by (or through) a kernel extension because the ioreg output on an Intel iMac shows:

| +-o TPM

However, the above has not been proven and even if it is the study of how EFI works on Macs does not imply a DMCA violation because EFI is not a DRM scheme. Rather EFI is merely the evolution of BIOS technology which has no DRM role.

[edit] 在 iMac 上的 EFI 外壳

There is NO EFI Shell built-in with the original Apple EFI firm 在 iMac 上的 EFI Shell

在原始的APPLE EFI 固件上没有内建的 EFI Shell ，由于大小的原因. 启动 EFI Shell 就是写一个简单的能修改 BOOT-NEXT 或 BOOT-FROM-FILE 变量的应用程序. 这些变量是用来控制计算机启动时的行为, 而默认行为则是从 HD 启动.

有人说他们能用 Intel EFI 的简单实现来引导 EFI Shell. 但很抱歉那不是真正的 Shell. 它是从 CSM 而不是 EFI 内核引导的.

请访问 这个站点 以获得完整的关于如何进入 Intel iMac 上的 EFI Shell 的教程 .

如果你想在 Intel Mac 上体验一把 EFI, 你可以试试 rEFIt_an_, 一个简单的 EFI 启动菜单和工具箱. 它让你可以直接访问 EFI shell 和内建的 EFI 菜单.

[">edit] 在 BIOS-PC上引导 EFI 实现

Intel provides a sample implementation (BIOS32 and ia32-Embedded) that runs on top of any normal PCs, unloading BIOS16 (going在 BIOS-PC上引导 EFI 实现

Intel 提供了一个简单的实现 (BIOS32 和 ia32-内置) 用以运行在普通 PC 上, 卸载 BIOS16 (进入保护模式) 并且加载 EFI 请求. 可能性讨论在 此 并且可以加载 .efi 文件并且可能, 最终, OS X.

• Intel Developer EFI Sample Implementationagreetoolkit.htm" rel=nofollow>Intel Developer EFI Application Toolkit

• For more info go here: Intel Developer EFI Toolsy/ia

[rnal text" title=http://appleintelfaq.com/ href="http://appleintelfaq.com/" rel=nofollow>Apple/Intel FAQ

EFI firmware

EDK - EFI Developer's Toolkit

EDK2.0 - EFI Developer's Toolkit 2.0 The next version of EFI firmware core .

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