From: Thomas Jarosch <thomas.jarosch@intra2net.com>
Date: Fri, 24 Sep 2010 14:22:48 +0000 (+0200)
Subject: Document the magic 0x02 0x03 0x01 value after the serial string
X-Git-Tag: v1.0rc1~133^2~40
X-Git-Url: http://developer.intra2net.com/git/?p=libftdi;a=commitdiff_plain;h=a45ea32b4ffd3f5aa04aabaac810e89a35916a3f

Document the magic 0x02 0x03 0x01 value after the serial string
---

diff --git a/doc/EEPROM-structure b/doc/EEPROM-structure
index 09c3e45..97fd6d0 100644
--- a/doc/EEPROM-structure
+++ b/doc/EEPROM-structure
@@ -92,6 +92,15 @@ CHIP values:
 
 1a        UA (all)
 
-Mprog doesn's seem to write this:
-After last string
-0x02 0x03 0x01 with PnP == 0
+
+Additional fields after the serial string:
+One byte: 0 - reserved for "legacy port name prefix"
+One byte: 0 - reserved for "legacy port name prefix"
+One byte: 0 - reserved for plug and play options
+(Observed values with PnP == 0:
+0x02 0x03 0x01)
+
+Note: The additional fields after the serial number string
+collide with the official FTDI formula from AN_121 regarding
+the start of the user area:
+"Start Address = the address following the last byte of SerialNumber string."