NIC bootrom burning

From NURDspace
Revision as of 04:09, 26 January 2020 by Dennis (talk | contribs)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
NIC bootrom burning
3Com bootrom.jpg
Participants Dennis
Skills Vendor specific software, flashrom, bootrom building
Status Dormant
Niche Software
Purpose Use in other project
Tool No
Tool category

NIC bootrom burning

3Com_bootrom.jpg {{#if:No | [[Tool Owner::{{{ProjectParticipants}}} | }} {{#if:No | [[Tool Cost::{{{Cost}}} | }}


Goal is to gather information on how to equip certain NICs with software for netboot stuff, for instance iPXE or gPXE (project seems dead).

Information per NIC vendor and model



We've got 2 of those, one REV A and one REV B. There's a DIP32 socket on both.


We've got 5 of those, with flash soldered on the board.

Possible flashing methods

Flashrom has support for some 3Com Cards but I could not get this to work just yet.

In system programming

Since the Atmel AT49BV512 is soldered on, in system programming might be nice to try. For this one could build or buy some socket that can be put over the chip and connect this to a programmer, possibly the Silicon Image card I already have. This card also works with flashrom.

3Com tools


This one has a DIP32 socket.


This one has a AT49BV512 flash chip soldered on.

Flashing with flashrom

Flash read and write with flashrom v0.9.6.1-r1671 on Debian 6 works. Rom image has to be exactly 65536 bytes. For testing I used a gPXE 1.0.1+ image from the gPXE rom builder.


Intel PRO/100S

Atmel AT498V512 soldered on the card

Flashrom no worky :(

flashrom v0.9.6.1-r1671 on Linux 2.6.32-5-486 (i686)
flashrom is free software, get the source code at

Calibrating delay loop... OK.
Mapping Intel NIC control/status reg at 0xd8020000, unaligned size 0x10.
No EEPROM/flash device found.
Note: flashrom can never write if the flash chip isn't found automatically.
Let's try again soon with a recent version of flashrom.

Vendor tools

Read more about it here



DIP28 socket.


Doesn't detect the Atmel AT28C256 flashchip.


DIP28 socket. Two of those tried.


Both won't detect the Atmel AT28C256 flashchip.


Building from source