are there any flashroms usable I can program via jtag?

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are there any flashroms usable I can program via jtag?
by peppers on 2005-10-14 (#5502)

I would like to get some sort of 256k flashrom or something like it of witch I can program useing a jtag cable and can be used for the nes do they exsist?

or perhaps anouther effective solution for what I want to do, witch is programing in cart without a programming device

by tepples on 2005-10-14 (#5509)

The "EFA" solution is to add a USB controller and some sort of CPLD that can write to the PRG and CHR buses in order to rewrite the flash chips.

The "SuperCard" solution, reminiscent of the FDS, is to add a 512 KB PRG RAM, a 256 KB CHR RAM, a CF or SD slot connected to a CPLD, and a small KB flash chip to hold a bootloader that loads a program from CF or SD.

In each case, the CPLD would probably act as the mapper.