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DECstation ESAR checksum?

To: linux-mips@fnet.fr
Subject: DECstation ESAR checksum?
From: Richard van den Berg <R.vandenBerg@inter.NL.net>
Date: Fri, 25 Sep 1998 20:00:46 +0200 (MET DST)
Hello,

Is there someone able to tell how the checksum of the Ethernet Station
Address ROM is calculated? This is the ROM layout with 'ba' being the
base address of the ROM:

0xba02  addres  octet   0
0xba06  addres  octet   1
0xba0a  addres  octet   2
0xba0e  addres  octet   3
0xba12  addres  octet   4
0xba16  addres  octet   5
0xba1a checksum octet   1
0xba1e checksum octet   2
0xba22 checksum octet   2
0xba26 checksum octet   1
0xba2a  addres  octet   5
0xba2e  addres  octet   4
0xba32  addres  octet   3
0xba36  addres  octet   2
0xba3a  addres  octet   1
0xba3e  addres  octet   0
0xba42  addres  octet   0
0xba46  addres  octet   1
0xba4a  addres  octet   2
0xba4e  addres  octet   3
0xba52  addres  octet   4
0xba56  addres  octet   5
0xba5a checksum octet   1
0xba5e checksum octet   2
0xba62  test    pattern 0  ff
0xba66  test    pattern 1  00
0xba6a  test    pattern 2  55
0xba6e  test    pattern 3  aa
0xba72  test    pattern 4  ff
0xba76  test    pattern 5  00
0xba7a  test    pattern 6  55
0xba7e  test    pattern 7  aa

With the two machines here having the following values:

                        5000/25         5000/133
addres  octet   0:      08              08
addres  octet   1:      00              00
addres  octet   2:      2b              2b
addres  octet   3:      30              2f
addres  octet   4:      8d              06
addres  octet   5:      2b              ca
checksum octet  1:      03              7d
checksum octet  2:      8c              28


Regards,

Richard

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