I'm thinking of using urjtag to load code, so I have a dirtyjtag board loaded 
with code via an ST-link,
and now I can see the code loading worked -- lsusb shows InterBiometrics.  I 
have a ftdi 2232H board coming soon.

After that, I'm stalled as I hit descriptions of using urjtag to program a 
flash saying not quite enough for
a newb:

3.1.6. Burn flash connected to the part

jtag> flashmem 0 brux.b
0x00000000
Note: Supported configuration is 2 x 16 bit only
BOOT_SEL: Asynchronous 32-bit ROM

So, what is 2 x 16 bit flash configuration, and how to find if STM32F401 uses 
it?  Dual bank it is not...

How to verify this:  Asynchronous 32-bit ROM?

maybe I could help write some docs?

Meanwhile reading how to use DFU mode of STM32F401 to load code instead.

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