[eepro100] eepro100 driver can't read serial eeprom that is beyond a bridge.

[Kallol Biswas]

Hi,
     We have a system  running 2.4.17 with the following configuration.


    ------North Bridge---------PCI-PCI-BRIDGE----82559ER
                                                     |
                                                   82559ER
# lspci
......
00:12.0 Ethernet controller: Intel Corp. 82559ER (rev 09)
.......
00:0f.0 PCI bridge: Digital Equipment Corporation DECchip 21152 (rev 03)
.........
02:01.0 Ethernet controller: Intel Corp. 82559ER (rev 09)

#insmod eepro100

.........
eth0: Intel Corp. 82559ER, l00:eC0:s85:/30:292:.9F, 4IRQ 12.
............

eth1: OEM i82557/i82558 10/100 Ethernet, FF:FF:FF:FF:FF:FF, IRQ 10.
........

It seems  eepro100 driver can't read the eeprom from the 2nd card. I have
printed the data bits in the
do_eeprom_cmd  routine, all were 1. Adjusting the delay  did not help.

The eepro100 driver on 2.2 kernel works fine and even intel's e100 driver on
2.4.17 also works fine.

I guess there may be some timing issues involved.

Are the  devices beyond a bridge  imapped to I/O space properly in 2.4
kernel? Intel's driver reads the EEPROM
control register using memory cycles.


Kallol