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Add some basic arm64 support #121

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Add some basic arm64 support #121

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@euank euank commented Oct 5, 2020

This was tested with a raspberry pi 4 netbooted with the EDK2 UEFI pxe boot implementation. You can find prebuilt binaries for that over here: https://github.com/pftf/RPi4

Of note, this does not work with the raspberry pi eeprom's pxe implementation as best I can tell. I'm not actually convinced the eeprom pxe impl supports proxyDHCP at all since I wasn't even getting tftp or pxe traffic from it after sending the initial dhcp offer.

This requires having a cross compiler available (pkg
gcc-aarch64-linux-gnu on debian).

THis is in preperation for adding some amount of raspberry pi 4 support.
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euank commented Oct 5, 2020

For reference, I tested this against my raspberry pi 4 using https://github.com/pftf/RPi4 + pixiecore quick debian testing --arch arm64. With these code changes, the above got me to a debian net installer.

This is enough support that `pixiecore quick debian testing --arch arm64`
is able to successfully boot a raspberry pi 4 that's using the
experimental edk2 raspberry pi UEFI firmware.

It does not seem to work with the built-in eeprom pxe booting the
raspberry pi 4 includes, but the eeprom pxe implementation is severely
lacking, so I'm not surprised.
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