Hi,
I would say yes. I am currently experimenting with that on another RT5350 board.
E.g. this programmer should work:
https://www.flashrom.org/Teensy_3.1_SPI ... WH_Flashertogether with a suitable clip (e.g.
http://www.ebay.de/itm/Test-Clip-Progra ... SwNgxWEroL).
I am running the programmer on a breadboard.
The VoCore board should be powered, but the CPU held in reset applying a low to POR_N. At the programmer only the SPI pins and GND should be connected.
I will try this the next few days and can give you feedback...
Regards, Thorsten
Edit:
Confirm. It really works as described above. Apply the following signals from the programmer to the flash:
1: SPI CS, 2: SPI MISO, 3: +3V3, 4: GND, 5: SPI MOSI, 6: SPI CLK, 7: +3V3, 8: +3V3. The +3V3 are provided by the booard, not by the programmer and shorted on the programmers breadboard.
I read/wrote the flash on my board (not a VoCore!) with flashrom:
flashrom -p serprog:dev=/dev/ttyACM0:1500000 -c MX25L3206E/MX25L3208E ...
Works like a charm!