2) I want something that can do the job Linux is doing now, which can be pretty fast and easy to do (may be a boot loader that can help me authenticate with the devices mentioned above).
With full support for the devices and protocols you'll be using, there's
not much out there that fits this point.
That actually depends. A downloaded bootstrap program using PXE has
access to basic networking functions like UNDI and if supported, even
some security/integrity services (BIS) which could be hijacked to do
something worthwhile.
Problem will be accessing other devices if you do not have the option of
just entering username/password. But in any case I really suggest
enhancing pxelinux (pxe syslinux variant) because it can load almost
anything. Even chainload bigger images with the help of memdisk.
Philippe
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