Help with cs: unable to map card memory on a MIPS32 router

[Roy]

There is a legacy data card "U630” (PCMCIA). When plugged in a router
with Linux 2.6.x code, there is the error from CS (card service),
"cs: unable to map card memory!" It means that daemon of Card Service
can not get the mapping space from Kernel. However, this card works
well with our Linux 2.4 code.

I see the followings in the two cases…

BRCM Linux 2.4:
---------------
pcmcia_adjust_resource_info() --> adjust_memory() --> add_interval()
can allocate memory successful and store it into a global variable
named "mem_db".

Then the function find_mem_region() can use the memory address stored
in "mem_db".


BRCM Linux 2.6:
---------------
pcmcia_adjust_resource_info() --> adjust_memory() --> add_interval()
can allocate memory successful, too.

But the system store it into a socket structure named "pcmcia_socket".
The function pci_find_parent_resource() return 0 (It means the bus
resource can not be found). pcmcia_find_mem_region() will be called in
linux kernel 2.6 but finally sends error message “cs: unable to map
card memory!”.

The I/O Memory which is needed by card service (PCMCIA) can be
accessible in Linux 2.4 but can not work in Linux 2.6. I am wondering
that the PCI Yenta Socket data structure changed in Linux 2.6 caused
the issue. Appreciate comment & any tip to debug this issue.


regards