BootFromPmem copies the ISO to pmem0 and boots given the syslinux configuration with the provided label.

LoadCustomConfigs is an alternative to ParseConfigFromISO that allows us to define the boot parameters ourselves (in a list of Config objects) instead of parsing them from a config file.

ParseConfigFromISO mounts the iso file, attempts to parse the config file, and returns a list of bootable boot.OSImage objects representing the parsed configs.

VerifyChecksum takes a path to the ISO and its checksum and compares the calculated checksum on the ISO against the checksum.