Development of the Fejkon kernel driver is done by using a custom QEMU device. The QEMU device (found under qemu-device) emulates the behavior of the FPGA allowing easy and quick development of the kernel driver (found under src).

The test harness (found under test) contains the test suite that will run under emulated user space. It contains a bunch of functions that test the various driver operations and return a test status.

Dependencies: libattr1-dev build-essential flex bison libssl-dev libelf-dev libglib2.0-dev libpixman-1-dev libcap-ng-dev libpcap-dev bc golang wget libcap-dev libattr1-dev

Run the tests by running make.

After the initial compile, any incremental change should take around ~5-10 seconds to compile and run. This has been a huge improvement for the usual 45 min turn-around time when having to compile a new FPGA bitstream and work with a physical server.

These are known requirements for fejkon:

• CONFIG_I2C_CHARDEV
• CONFIG_IRQ_REMAP

If you get the following error make sure to upgrade linux-libc-dev to 4.19.118-2+deb10u1 or newer. The bug report can be found here.

/usr/include/linux/swab.h: In function ‘__swab’:
/home/bluecmd/fejkon/driver/qemu/include/qemu/bitops.h:20:34: warning: "sizeof" is not defined, evaluates to 0 [-Wundef]
 #define BITS_PER_LONG           (sizeof (unsigned long) * BITS_PER_BYTE)
                                  ^~~~~~
/home/bluecmd/fejkon/driver/qemu/include/qemu/bitops.h:20:41: error: missing binary operator before token "("
 #define BITS_PER_LONG           (sizeof (unsigned long) * BITS_PER_BYTE)