I've converted your SPI log into a binary
Seems to be valid but the Flash should be 4MB so I'm not sure if your log is missing something
Some strings:
ROM:0001190B aNintendoSwitch DCB "Nintendo Switch",0
ROM:0001191B aNintendorobson DCB "NintendoRobson",0
ROM:0001192B aNintendo DCB...