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<xypron>
Tartarus: The EFI stub brings its own x86 device drivers. The EFI app relies on the services offered by the host EFI implementation.
<Tartarus>
OK. And in the stub, that relies on the EFI implementation to load the drivers and then expose them the normal EFI way yes?
<Tartarus>
In my mind at least, on the U-Boot side, U-Boot as app or payload should be the same, outside of the stuff that we've already had to extract for things like "hello world" to already work and be generic, for any arch
<xypron>
Tartarus: The payload (stub) does not rely on anything but being being loaded by a UEFI firmware. The EFI payload exposes an EFI API of its own. The EFI app does not.
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<xypron>
Tartarus: I guess any defconfig which produces a relocatable U-Boot should be reconfigurable as payload which just means to prepend a header to jump to the normal U-Boot entry point.
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<Tartarus>
Yes
<xypron>
Tartarus: For the app architecture dependency comes where it load a kernel and boots it via the legacy entry point. Booting an EFI application would have to be delegated back to the host UEFI implementation.
<Tartarus>
Same as x86?
<Tartarus>
I mean, maybe we're talking about different problems here
<Tartarus>
The "make U-Boot run from UEFI" part should be architecture agnostic. Just like our EFI hello world is. We're run from UEFI and there's APIs to follow and use, and we should have those things abstracted already
<Tartarus>
The only odd thing I see right now is that there's stuff in arch/x86/cpu/efi which really should be in board/ but it too is not x86 centric, by and large
<Tartarus>
(or when it is, it's trivially so)
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<pedro_pt69>
hi , anyone here with experience in u-boot
<mps>
:) (sorry couldn't resist)
<pedro_pt69>
i have here an isp router that does not allow me to get a shell , they locked it after boot , but i can have access over serial line to uboot