commit 6ba671acd922ee046b257c5119b8a0f64d275473
author Michael Brown <mcb30@ipxe.org> Mon Jan 17 16:17:17 2022 +0000
committer Michael Brown <mcb30@ipxe.org> Tue Jan 18 13:16:12 2022 +0000
tree b68c9ec07b822b18c717cbcabf692b744175bd03
parent ec746c00012317ba228d7043fa141d5e6a48c17c

[efi] Attempt to fetch autoexec script via TFTP

Attempt to fetch the autoexec.ipxe script via TFTP using the PXE base
code protocol installed on the loaded image's device handle, if
present.

This provides a generic alternative to the use of an embedded script
for chainloaded binaries, which is particularly useful in a UEFI
Secure Boot environment since it allows the script to be modified
without the need to sign a new binary.

As a side effect, this also provides a third method for breaking the
PXE chainloading loop (as an alternative to requiring an embedded
script or custom DHCP server configuration).

Signed-off-by: Michael Brown <mcb30@ipxe.org>