[Etherboot-developers] Re: 3Com 3C905B and fix

[Michael H. <m.h...@so...>]

Hello!

> I tried to use etherboot 5.0.5 with 3C905B (the one with buggy Lucent
> chipset).

I investigated a bit further in this topic. To see how 3com resp. Lanworks
deal with this bug I used a 3C905C-TXM with MBA Rom built in. Donald
Beckers vortex-diag.c (www.scyld.com) says in pcidev_tbl that this card
(PCI ID: 0x10b7/0x9200) has also the flash_bug.

Rom-Scan detects a 2k rom image. Inspecting the rom contents with
vortex-diag -B makes me believing 3com work around this bug by a loader
in the first 2k of the rom (checksum for 2k of rom!), which sets the
transceiver
type temporarily (not in eeprom like 3C90X_BOOTROM_FIX), then reads/
copies the whole rom content and then boots.

Maybe we could implement a similar loader to etherboot, eleminating those
nasty 3C90X_BOOTROM_FIX hack.
I hope then there are no more side effects like NT4 and DOS driver  (would
make me happy ;-) ) problems.

Michael Hertel
Sommer GmbH & Co. KG




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