Date: Thu, 4 Jun 2009 15:02:30 -0400 From: AJ Shipley <aric.shipley@gmail.com> To: freebsd-drivers@freebsd.org Subject: Kernel Loadable Driver vs. Custom Compiled Driver Question Message-ID: <be8835320906041202g18ee68ccm159501adc7d17f4d@mail.gmail.com>
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Hi, I am in the process of integrating a 3rd party HW vendor=92s driver into our FreeBSD code base. The driver works when it is loaded as a KLM using kldload =96v <driver_name> but when I modified the kernel using config and compiled the driver into the kernel, it does not work. The kernel builds and installs fine, but the driver does not load correctly. I was able to verify that the first 10 steps of the driver works during load in both cases and that the driver is loading the device into the same PCI memory range (it=92s a PCI based HW card). However, at a critical step in the driver, it polls an ISR register waiting for a bit to toggle high indicating that the board is ready and out of reset and it never does, and eventually hits the driver timeout and aborts its load. Why would a driver work as a KLM but not statically compiled into the kerne= l? Thanks AJ Shipley
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