--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/artifacts/om-debug-board-v3	Mon Sep 11 04:55:27 2023 +0000
@@ -0,0 +1,31 @@
+# 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