Greetings,
*** Please CC: me on replies -- I'm not subscribed.
A patch by Mike Isely that went into what became kernel 2.6.19 has modified
'cypress_m8.c' in such a way that it makes the DeLorme Earthmate LT-20 USB
GPS receiver stop working entirely.
After a little digging, I narrowed the problem down to a single line of code
which, if disabled, restores the full functionality of the aforementioned
LT-20 GPS.
The offending line is in the 'cypress_serial_control()' function:
cypress_set_dead(port);
This occurs at line number 407 in the vanilla 2.6.20 kernel's code.
Basically, it's in this block of code (with my hack to disable the problematic
line):
if (retval != 5) {
err("%s - failed to retrieve serial line settings - %d",
__FUNCTION__,
retval);
// cypress_set_dead(port);
return retval;
} else {
I don't know what the "proper" fix is, since the 'Cypress' chipset served by
this driver is undoubtedly used by devices other than my Earthmate LT-20 USB
GPS receiver and I'm guessing that the patch that broke things for me solved
a problem for someone else.
But clearly something needs to be changed if this LT-20 GPS device (which I've
successfully used under older 2.6.x kernels for about 17 months now) is to be
usable again.
Ideas? Comments? Anyone? :^)
Also, it's not a huge issue, but when rather large changes go into a kernel
module, shouldn't the module version be incremented? The 'cypress_m8' module
stayed at "v1.09" throughout these substantial (IMHO) changes.
Thanks in advance for any insight anyone might offer....
*** Please CC: me on replies -- I'm not subscribed.
Bill Marr
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