On non-BBS systems, we have to hook INT 19 in order to be able to boot from the gPXE ROM at all. However, doing this unconditionally will prevent the user from booting via any other devices. Previously, the INT 19 entry point would prompt the user to press B in order to boot from gPXE, which makes it impossible to perform an unattended network boot. We now prompt the user to press N to skip booting from gPXE, which allows for unattended operation. This should be a better match for most real-world scenarios. Most modern systems support BBS and so are unaffected by this change. Very old (non-BBS) systems tend not to have PXE ROMs by default anyway; if the user has added a gPXE ROM then they probably do want to boot from the network. Newer non-BBS systems are essentially limited to IBM servers, which will recapture the INT 19 vector anyway and implement their own boot-ordering selection mechanism.tags/v0.9.7
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