IBM Microdrive PCCard on TiBook (ide-cs module)
iweiny at acm.org
Sat Jul 7 04:40:01 EST 2001
I have spent a little more time tracking down why the PCCard adapter for
my Microdrive causes the TiBook to shutdown. But I need some help in
interpreting the information I have found.
1) I was able to catch with xmon a stack trace before it shutdown. This
showed a stack trace as follows:
ide-probe.c:actual_try_to_identify <== shutdown somewhere here??
2) I am assuming at this point it is writing to registers which are
mapped incorrectly (probably to the PMU) which cause it to shutdown.
3) I have found that the io_base addresses is 0x1000 (as set in my
config.opts file) and this is what is passed to the ide_register
function. Changing this address does not seem to change it's behavior
4) ide_register calls ide_init_hwif_ports with these addresses which
have a "pmac_" specific call. So I am assuming that it would "ioremap"
these as appropriate. (However, I don't see it modifying this address
5) ide_register_hw calls "ide_probe_module" which takes me into the
ide-probe.c file. But I see a specific "pmac_ide_probe" which is called
at init time.
My conclusion is that I should either be calling this pmac_ide_probe
rather than the generic ide_probe module (and making it _not_ an init
function). OR I need to modify the ide_probe module to handle the
proper maping of the addresses such that I don't write to the PMU.
Unfortunatly I have not found any examples of the later in the pcmcia
drivers I have looked at so I am worried that I am totally off base. If
I am "barking up the wrong tree" I hope someone can tell me such that I
can start looking elsewhere.
Thanks in advance,
iweiny at acm.org
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