- GCI Loader: gecko-gosub + 06 bin + 04 bl to onReadOptionBlock
- place GCI Loader code at 817FE800 since [817FEEA0, 81800000) is used
by system
- place buffer at 817F1800 (instead of 817F1000+4) since there seems to
be some alignment issue
- Assume file size == 0x2000*6 since fileInfo->length seems to be 0