On Fri, May 18, 2018 at 3:24 PM, Amaan Cheval <amaan.che...@gmail.com> wrote:
> Hi everyone! > > I've written a quick blog post summarizing the options I've considered > to make the x86_64 port work with UEFI firmware - the primary winner > seems to be in my eyes to use "gnu-efi" and to add support for the > target "pei-x86-64" (aliased to "efi-app-x86_64") to > "x86_64-rtems5-objcopy" in binutils. I've submitted a patch for this > here[1]. > That patch is quite simple so shouldn't be a problem if this is the direction that gets consensus. > > The blog post is here: > https://blog.whatthedude.com/post/uefi-app-options/ > > I'd appreciate all feedback (and please do let me know if I haven't > provided enough context)! > > Specifically, some concerns I'd like to discuss are: > > - Does everyone agree with me on choosing gnu-efi + objcopy as our > method of choice? > Does using gnu-efi add code that runs on the target? Can you point us to the files, if so. Can you tell which approach FreeBSD takes? > - How do we integrate gnu-efi into our build process? A part of the > RSB, making sure the path to the libraries are in an exported > variable? Or perhaps a part of the RTEMS kernel itself if the licenses > are compatible (I don't see any on the project[2], only copyright > notices within the source files of the release versions). > GNU-efi would be built like qemu or the device tree compiler would be my guess and x86_64-rtems toolset might add that to the standard set of tools. License on host tools being GPL isn't an issue. > - Regardless of how we manage UEFI, do we require Multiboot support > too? Multiboot drops us in a 32-bit protected mode environment, > whereas 64-bit UEFI firmware will boot us into 64-bit long mode - this > would mean the kernel would need to support separate code-paths for > the 2 if we want to support both methods. > That's a good question. For GSoC, I think UEFI is fine and perhaps a ticket under the general "modern PC support" ticket for multiboot support. Unless that eliminates a LOT of PCs. I don't want you to spend all summer getting an image to boot both ways. Personally, I want you to have a working BSP one way. :) > > [1] https://www.sourceware.org/ml/binutils/2018-05/msg00197.html > [2] https://sourceforge.net/projects/gnu-efi/ > --joel
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