addition: with
ft2232_spi:type=2232H,port=A,divisor=4
write succeeds and read gives consistent results. The board is the ELV UM-FT2232H.
https://de.elv.com/elv-highspeed-mini-usb-modul-um-ft2232h-komplettbausatz-0...
and the target is the linsn rv901t fpga board. Which brings me to an additional question: to access the onboard spi flash PROGRAM_B needs to be pulled down during external access. Currently I do this by hand, but can I just wire it to a free pin and tell flashrom to do it?
thanks, Arne
On 12/7/22 18:32, Arne Jansen wrote:
Hi,
I encountered a flash chip that is not known to flashrom. I built flashrom from git, HEAD 153359935aa5. Write reported a fail, the other operations suceeded. Command line was:
LD_LIBRARY_PATH=/home/arne/libftdi/build/src/libftdi.so.2 /home/arne/flashrom/flashrom -p ft2232_spi:type=2232H,port=A -w rv901_orig_rom.bin
on arch linux (i needed build libftdi from source due to missing symbols in libusb).
The datasheet for the chip is probably
https://semic-boutique.com/wp-content/uploads/2016/05/ZB25VQ32.pdf
Attached are the -VV logs for id, erase, write and read.
Repeating write always fail in different places.
-Arne