igrr h4rm0n1c: interesting, thanks. my nodemcu v1 is ch341 based and only works 100% at 230400, a bit at 460800 and not at all at higher speeds.
i have one of those ft232 adapters and a nodemcu v2 coming to me, and a pcb design foran FT2232H based board (to have JTAG and usb/serial side by side) in progress, so I'll see what kind of speeds I can hit then
@igrr: that was the idea I needed. Like we discussed here: http://www.esp8266.com/viewtopic.php?f=32&t=4432 the generic module has more parameters especially for spiffs. I just changed the reset method for the generic esp8266 to nodemcu, like you described. And voila....working :-)