Re: eata.c module and PCI setup problem (RAID SCSI card)
On 4 Jun, this message from Antoine Delvaux echoed through cyberspace:
> I'm currently trying to make a DPT PM2144UW PCI card with a
> SmartCache IV and 64 MB working. It's a UW SCSI raid controller. The
> card is working fine in an Intel based box with the eata driver. But in
> my PowerMac 7500 G3, I can't make it work.
7600 here...
> Since two days I've been in touch with the developper of the eata.c
> driver (Ballabio Dario) and he gave me a few debug version of that
> driver to play with. Unfortunately we have come to a point where he
> can't do more since the problem seems to come from PCI code of the ppc
> kernel tree.
>
> If anyone here have experience in this field, I welcome his advices as
> do not know where to start to search. With the latest debugging enabled
> eata.c module given by Ballabio, I've got the following output :
I had some similar problems when trying to make a Promise IDE card work
in my Mac... but that was a few years ago.
> # insmod eata.o io_port=0x1400
^^^^^^
Where are you getting this value from? I'm sure it is wrong... Have a
look at the boot messages of your kernel, and also send along the output
of 'lspci -vv'.
> # tail /var/log/syslog
> Jun 4 13:52:38 brocoli kernel: IN from bad port 1408 at d005392c
This message means you are trying to read from an address where no
device is listening. Either the IO port (0x1408) is wrong, or the device
isn't configured to reply to IO accesses on the PCI bus.
> And here is his answer :
>
> ------------
> The message
> IN from bad port 1408 at d005392c
> comes from linux/arch/ppc/kernel/traps.c
> (about line 162, inside #ifdef CONFIG_ALL_PPC)
> It looks like your setup is not able to read a single byte from location
> 0x1408.
> This is what I'm trying to do to see if the board is there (inb(0x1400 +
> eata_reg_offset).
> So either you can fix your hw/kernel parameters in order to allow inb()
> from a legal I/O port address,
There's no such thing as legal I/O port address on powerpc. I/O ports
are just another memory-mapped device; and accessing non-existing memory
dosn't work on any machine ;-).
> otherwise there is nothing I can do for
> you. I had a look to the sources of the other 2 scsi drivers you use
> (mesh and mac53C94) and they use an approach to I/O very specific to the
> MAC architecture. Nothing that can be implemented in the EATA driver
> without a full rewrite.
> -------------
>
> I do not know where to start, is the inb() function supposed to do
> exactly the same on i386 and ppc ? Where could the problem come from ?
inb() works as expected as long as you feed it the right port value.
I've looked at the code a bit; can you try to recompile the eata module
with DEBUG_PCI_DETECT defined, and send the kernel's log output? Also,
try an insmod without the io= option.
Cheers
Michel
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