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Subjecteepro100 driver can't read serial eeprom that is beyond a bridge

We have a system running 2.4.17 with the following configuration.

------North Bridge---------PCI-PCI-BRIDGE----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
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.


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