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calypso-jtag configs: leave FT2232x ADBUS[6:4] as inputs to allow the use of these GPIO lines for EMU0/1 experimentation
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 21 May 2019 22:43:00 +0000
parents af70c59654ed
children
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# Openmoko's custom debug board for their Neo1973 and Neo FreeRunner
# smartphones is an important piece of history; to the best of my
# (Mychaela's) understanding, it was one of the first FT2232x devices
# to formalize the idea of having the kernel create only one ttyUSB
# device for Channel B (which is a standard UART), leaving Channel A
# untouched for userspace applications like OpenOCD.  The feat is
# accomplished by giving the device a custom USB ID (the one used by
# OM for this debug board is 1457:5118), and teaching the ftdi_sio
# driver in the Linux kernel to create only one ttyUSB device for
# such USD IDs.
#
# What follows is a dump of the EEPROM made from the debug board which
# I got with my FreeRunner back in 2011; it appears to have a per-unit
# serial number string.  The FTDI chip is FT2232D and the EEPROM is a 93C56.

00: 0802 1457 5118 0500 3280 0000 0200 1296
10: 30A8 12D8 0056 0000 0000 0000 0000 0000
20: 0000 0000 0000 0000 0000 0000 0000 0000
30: 0000 0000 0000 0000 0000 0000 0000 0000
40: 0000 0000 0000 0000 0000 0000 0000 0000
50: 0000 0000 0000 0000 0000 0000 0000 0000
60: 0000 0000 0000 0000 0000 0000 0000 0000
70: 0000 0000 0000 0000 0000 0000 0000 0000
80: 0000 0000 0000 0000 0000 0000 0000 0000
90: 0000 0000 0000 0312 004F 0070 0065 006E
A0: 004D 006F 006B 006F 0330 0044 0065 0062
B0: 0075 0067 0020 0042 006F 0061 0072 0064
C0: 0020 0066 006F 0072 0020 004E 0065 006F
D0: 0031 0039 0037 0033 0312 0046 0054 0053
E0: 0048 0044 004E 0032 004B 0000 0001 0000
F0: 0000 0000 0000 0000 0000 0000 0000 773F