vt6307ohciver.c from Krzysztof Halasa, tool to switch VT6307* Firewire cards from OHCI-1.0 to OHCI-1.1

Original code from Krzysztof Halasa at http://www.kernel.org/~chris/vt6307ohciver.c

See http://comments.gmane.org/gmane.linux.kernel.firewire.user/2881

Documentation (sort of):

Krzysztof Halasa | 21 Oct 2007 01:23

Re: VIA VT6307 OHCI version?

Ok. I just put a program on something like http://www.kernel.org/~chris/vt6307ohciver.c

Anybody with OHCI-1.0 VT6307* Firewire chip may want to try. Obviously it's based on undocumented features, it may blow your machine etc.

Please remove your ohci1394 or firewire-ohci driver before using this program.

Compile with the usual spell: gcc -Wall -O2 vt6307ohciver.c -o vt6307ohciver

Examine (and backup) the EEPROM data first:

01:04.0 FireWire (IEEE 1394): VIA Technologies, Inc. IEEE 1394 Host Controller (rev 80)

[some debug info] It seems your VT6307 chip is connected to I^2C (24c01 or similar) EEPROM

EEPROM dump: 00: 00 10 DC 00 01 01 D4 F2 04 04 32 55 F8 00 A2 02 10: A1 00 40 63 62 14 0D 25 03 DF 40 80 00 20 00 73 20: 3C 10 00 00 00 00 FF FF FF FF FF FF FF FF FF FF ^^ Your VT6307 chip is in OHCI 1.0 mode

(If you have only one VIA firewire chip you can use "" as the argument.)

I'd check if there is a small SMD 8-pin 24c01 or similar EEPROM near VT6307 if I were you. Alternatively the program may say you have 93c46, also a small 8-pin chip.

Now you can try upgrading to OHCI-1.1:

It seems your VT6307 chip is connected to I^2C (24c01 or similar) EEPROM writing 0x08 at address 0x22 Please reboot

People with 93c46 will see 0x11 address.

Do as commanded, reboot (PCI reset) is required for the VT6307 to reload the configuration from its EEPROM.

Please let me know if it doesn't work.

This program may possibly run on VT6306-based board/card as well, though I don't know what would happen (I suspect it could work, but may need some modifications).

The "dump" function should work with any OHCI firewire device, though for non-VIA chips you would have to change PCI device/vendor ID in the source.

If you have a VT6306-based card and you run this program, I'd appreciate it if you let me know the EEPROM contents (make sure you mention chip type) and, if you tried "upgrading" or "downgrading", if it worked. In theory VT6306 should be able to run in OHCI-1.1 mode, but I don't really know. VT6306 only supports 93c46 EEPROM so if the program says 24c01 you may want to force it (edit the source) and let me know.

VT6305 users may not bother, this chip doesn't support OHCI-1.1. Not sure if anything like it ever existed, though.