iPXE booting a preloaded pxelinux.0

[idunnowhattocallthisusername]

why not get rid of pxelinux.0 and just have your ipxe script like this:

kernel http://${next-server}/UpdateFirmware/img2a vga=0x317 root=/dev/ram0 rw ramdisk_size=100000 tftp_server=192.168.99.1 tftp_tcrootfs=/UpdateFirmware/tcrootfs tftp_tczip=/UpdateFirmware/tc.zip debug_level=1 silent_boot=no boot_src=4 iommu=soft ipstatic6=auto
(command is probably wrapped and should all be on one line)
initrd http://${next-server}/UpdateFirmware/img3a
boot