On Sunday, September 14, 2014 07:56:16 PM Thomas Mueller wrote:
I want to build a kernel with debugging for a specific device, rather than
for everything.
Device of interest is re (Ethernet driver), also rsu (USB wlan adapter).
I looked in Makefiles, also NOTES files, found some DEBUG options but
nothing really general that could be applied to any desired device in
kernel or module.
Then I would need to know how to find this debugging information.
There isn't a generic debugging for driver X knob. You can enable global
debugging (e.g. INVARIANTS). Some drivers may have their own internal knobs,
but most drivers depend on the global knobs. If you are debugging a driver as
a module, you can build the kernel with INVARIANT_SUPPORT and just the driver
with INVARIANTS. However, drivers invariably make calls into other subsystems
in the kernel and that setup will not include checking for driver misbehavior
in its interfacing with those subsystems, so I would generally recommend just
enabling INVARIANTS globally.
--
John Baldwin
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